The present disclosure relates generally to the replacement of a portion of an articular surface.
Articular cartilage, found at the ends of articulating bone in the body, is typically composed of hyaline cartilage, which has many unique properties that allow it to function effectively as a smooth and lubricious load-bearing surface. However, when injured, hyaline cartilage cells are not typically replaced by new hyaline cartilage cells. Healing is dependent upon the occurrence of bleeding from the underlying bone and formation of scar or reparative cartilage called fibrocartilage. While similar, fibrocartilage does not possess the same unique aspects of native hyaline cartilage and tends to be far less durable.
Hyaline cartilage problems, particularly in knee and hip joints, are generally caused by disease such as occurs with rheumatoid arthritis or wear and tear (osteoarthritis). Hyaline cartilage problems may also be the result of an injury, either acute (sudden) or recurrent and chronic (ongoing). Such cartilage disease or deterioration can compromise the articular surface causing pain and further deterioration of joint function. As a result, various methods have been developed to treat and repair damaged or destroyed articular cartilage.
For smaller defects, traditional options for this type of problem include non-operative therapies (e.g., oral medication or medication by injection into the joint), or performing a surgical procedure called abrasion arthroplasty or abrasion chondralplasty. The principle behind this procedure is to attempt to stimulate natural healing. At the defect site, the bone surface is abraded, removing approximately 1 mm. or less using a high-speed rotary burr or shaving device. This creates an exposed subchondral bone bed that will bleed and will initiate a fibrocartilage healing response. Although this procedure has been widely used over the past two decades and can provide good short term results, (1-3 years), the resulting fibrocartilage surface is seldom able to support long-term weight bearing, particularly in high-activity patients, and is prone to wear.
Another procedure, referred to as the “microfracture” technique, incorporates similar concepts of creating exposed subchondral bone. During the procedure, the cartilage layer of the chondral defect is removed. Several pathways or “microfractures” are created to the subchondral bleeding bone bed by impacting a metal pick or surgical awl at a minimum number of locations within the lesion. By establishing bleeding in the lesion and by creating a pathway to the subchondral bone, a fibrocartilage healing response is initiated, forming a replacement surface. Results for this technique are generally similar to abrasion chondralplasty.
Another known option to treat damaged articular cartilage is a cartilage transplant, referred to as a Mosaicplasty or osteoarticular transfer system (OATS) technique. This technique involves using a series of dowel cutting instruments to harvest a plug of articular cartilage and subchondral bone from a donor site, which can then be implanted into a core made into the defect site. By repeating this process, transferring a series of plugs, and by placing them in close proximity to one another, in mosaic-like fashion, a new grafted hyaline cartilage surface can be established. The result is a hyaline-like surface interposed with a fibrocartilage healing response between each graft.
Such an OATS procedure is technically difficult, as all grafts must be taken with the axis of the harvesting coring drill being kept perpendicular to the articular surface at the point of harvest. Also, all graft placement sites must be drilled with the axis of a similar coring tool being kept perpendicular to the articular surface at the point of implantation. Further, all grafts must be placed so that the articular surface portion of these cartilage and bone plugs is delivered to the implantation site and seated at the same level as the surrounding articular surface. If these plugs are not properly placed in relation to the surrounding articular surface, the procedure can have a very detrimental effect on the mating articular surface. If the plugs are placed too far below the level of the surrounding articular surface, no benefit from the procedure will be gained. Further, based on the requirement of perpendicularity on all harvesting and placement sites, the procedure requires many access and approach angles that typically require an open field surgical procedure. Finally, this procedure requires a lengthy post-operative non-weight bearing course.
Transplantation of previously harvested hyaline cartilage cells from the same patient has been utilized in recent years. After the cartilage is removed or harvested, it is cultured in the lab to obtain an increase in the number of cells. These cells are later injected back into the focal defect site and retained by sewing a patch of periosteal tissue over the top of the defect to contain the cells while they heal and mature. The disadvantages of this procedure are its enormous expense, technical complexity, and the need for an open knee surgery. Further, this technique is still considered somewhat experimental and long-term results are unknown. Some early studies have concluded that this approach offers no significant improvement in outcomes over traditional abrasion and microfracture techniques.
Features and advantages of the present invention are set forth by description of embodiments consistent with the present invention, which description should be considered in conjunction with the accompanying drawings wherein:
The present disclosure relates to a system for replacing a portion of an articular surface. While the methods and instruments described herein are particularly directed at the replacement of a portion of an articular surface of a femoral condyle and/or a tibial condyle, the system herein may suitable by employed for replacing a portion of other articular surfaces. Additionally, while the disclosure is relates to replacing a portion of each of two cooperating articular surfaces, the system herein may be used to replace only a portion of one articular surface of a joint, without necessitating the replacement of a cooperating articular surface of the joint.
Referring to
Turning first to
The shaft 16 of the support member 12 may include a lumen, not shown, providing access via the shaft 16 to the opening 20 of the cutter support 18. The lumen defined by the shaft 16 may provide suction, supply a fluid, such as for flushing the region of the cutter support 18, etc. Alternatively, an inner shaft (not shown) may be translatably disposed at least partially within the lumen. The inner shaft may be at least partially extensible into the opening 20 defined in the support 18. The inner shaft may be urged into or towards the opening 20, for example, and act against an edge of a member disposed in the opening 20. The pressure of the inner shaft bearing against a member disposed in the opening 20 may aid in maintaining the member in the opening, for example, be creating a frictional interaction between the member and the support 18 and/or the inner shaft.
The shaft 16 may also include features, such as collar or ring 22, as well as other features and/or indicia along the length and/or circumference of the shaft 16 to facilitate manipulating the support member and/or for providing reference for use in conjunction with cooperating instruments. For example, the features or indicia may be used to align and/or position other instruments in a desired relationship with the support member and/or the cutter support 18 or opening defined therein.
The support member 12 may also include a shoe 24 that may be radially moveable into the opening 20. In one embodiment, the shoe 24 may form a portion of the circumference of the opening 20 in a retracted position, and extend into the opening 20 in a second position. The shoe 24 may be biased to a position extending into the opening 20, for example by a spring or a translatable shaft disposed in the lumen of the shaft 16. Accordingly, when the cutter 14 is disposed within the opening 20 the shoe 24 may be in a retracted position, i.e., at or withdrawn from the circumference of the opening 20, and when the cutter 14 is removed from the opening 20 the shoe 24 may be in an extended position, i.e., extending at least partially into the opening 20. In one embodiment, it is contemplated that the shoe 24 may have a height less that the height of the cutter support 18. Accordingly, the shoe 24 may move to an extended position when the cutter 14 is still partially received in the opening 20.
The cutter 14 may be formed having a generally circular cross-section sized to be rotatably received within the opening 20 of the support member 12. The diameter of the cutter 14 may be sized to allow the cutter 14 to be guided by the cutter support 18 with a minimal of play or run-out. The cutter 14 may be configured for cutting or boring in an axial direction.
The cutter 14 may include a cutting face 26. The cutting face 26 may engage an articular surface in which an implant site is to be formed. The cutting face 26 may include features suitable for excising the articular cartilage and/or underlying bone to form an implant site. According to one embodiment, cutting face 26 of the cutter 14 may include a taper, for example providing the cutting face 26 having a shallow conical surface. The cutting face 26 may also include a centering point 27. Consistent with the illustrated embodiment, the centering point 27 may be a conical protrusion, or other protrusion providing a point. The centering point 27 may establish, and maintain, the cutter 14 along an axis extending through the center of the cutter. Also as shown in the illustrated embodiment, the cutter 14 may include cut-outs, or flutes, 28, 30. The flutes 28, 30 may provide leading cutting edges, e.g. 32 in the illustrated embodiment, that are angled relative to the axis of the cutter 14. According to one embodiment, the flutes 28, 30 may have a helical configuration about the axis of the cutter 14. The illustrated embodiment of the cutter 14 includes two flutes 28, 30. However, alternative embodiments may be provided with a more or fewer flutes consistent with the present disclosure.
According to the above-described embodiment, the cutter 14 may be provided resembling a section of a twist drill bit. As such, when the illustrated cutter 14 is rotated in a clockwise direction the leading cutting edges 32 may cut into a surface or body to be excised, in a similar manner to a drill bit. The flutes 28, 30 may allow debris produces during excision to be evacuated from the implant site being formed, e.g. to the top of the cutter 14. Debris removed from the implant site being formed may be collected, for example using a suction device associated with, or positioned adjacent to the cutter support 18. Allowing debris to be evacuated from the implant site being formed may reduce compacting of debris at the sides of the cutter 14, binding of the cutter 14, and/or facilitate faster and more efficient excision of the articular surface and/or underlying bone.
According to another embodiment, the cutting face 26 of the cutter may include one or more cutting blades. The cutting blades may extend from the cutting face 26 either axially or at an angle to the axis of the cutter 14. Similarly, the cutting blades may be arranged extending radially or at an angle. According to various embodiments, the cutting blades may be integrally formed with the cutter, may be separate components fixed to the cutter, or may be replaceable components removably attached to the cutter. Similar to the illustrated embodiment, a cutter including cutting blades extending from the cutting face may include flutes to facilitate the removal of debris from an excision site.
The cutter 14 may also include a top face 34. The top face 34 may include an upstanding rib 36 around the circumference of the cutter 14. Effectively, the upstanding rib 36 may provide the top face 34 having a recessed configuration. The top face 34 may also be provided as a non-recessed feature, whereby the upstanding rib 36 may be eliminated.
Consistent with the present disclosure, the top face 34 may include a drive socket 38. The drive socket 38 may be configured to receive a cooperating drive element to allow the transmission of torque from the drive element to the cutter 14. As in the illustrate embodiment, the drive socket 38 may be configured as a hexagonal socket, which may receive a hexagonal end of a drive element to allow torque to be transmitted to the cutter 14 from the drive element. The socket 38 may include a chamfered upper edge 40 to facilitate insertion and engagement of a cooperating drive element. Various other socket configurations may suitably be employed to allow transmission of torque from a drive element to the cutter 14. For example, the socket 38 may include a splined socket, a flatted circular socket, a polygonal socket, etc. Additionally, it is contemplated herein that rather than a socket, the cutter may include a protrusion, such as a hexagonal protrusion, etc., that may be engaged by a socket on a drive element. Various other combinations of features may also suitably be used for transmitting torque between a drive element and the cutter.
Turning to
Consistent with the system herein, at least a portion of the cooperating articular surface, e.g., an articular surface of the femur, may be resected prior to creating an implant site using the cutting system 10 herein. Resecting at least a portion of a cooperating articular surface may increase the clearance between the articular surfaces, thereby increasing access to the articular surface to be excised by the cutting system 10.
The shaft 16 may be manipulated to locate the opening 20 of the cutter support 18, and thereby locate the cutter 14, in a desired position on the articular surface. For example, the cutter 14 may be positioned generally centered over, or at least partially encompassing a defect in and articular surface. The defect may include, for example, a region of damaged articular cartilage, a lesion, etc. Furthermore, the cutter 14 may be positioned in a location of a desired auxiliary implant, such as an implant capable of interacting with an implant on a cooperating articular surface, for example to provide smoother operation or improved wear characteristics relative to native cartilage. Consistent with one embodiment, the shaft 12 may be manipulated to push the meniscus 104 aside with the cutter support 18. Accordingly it may be possible to directly expose an articular surface to the cutter 14. By employing such a technique, it may be possible to provide an implant on an articular surface of a knee without damaging the meniscus. By preserving the meniscus in this manner, it may be possible to provide a joint including articular surface implants having a smoother operation, better shock absorbing characteristics, better wear characteristics, and/or a more natural feel as compared to a joint including articular surface implants and having the meniscus removed. Preserving the meniscus is not, however, essential within the scope of the present disclosure.
Referring next to
The drill guide 200 may also include a second alignment feature 204 coupled in a desired relationship to the first alignment feature 202 by a support structure 206. The support structure 206 may include an arm extending between the first and second alignment features 202, 204. In the illustrated embodiment the support structure 206 is provided as a continuous arcuate member. Various other embodiments of the support structure 206 may suitably be employed for providing a desired relationship between the first and second alignment features 202, 204. For example, the support structure 206 may include one or more straight sections and/or additional features.
Furthermore, consistent with one embodiment, the support structure 206 may be adjustable and/or capable of providing a plurality of relationships between the first and second alignment features 202, 204. The support structure 206 may be adjustably coupled to one or both of the first and second alignment features 202, 204. The support structure 206 may also, or alternatively, include adjustable portion along the extent of the support structure 206 capable of adjusting the relationship between the first and second alignment features 202, 204. One or more adjustable features of the drill guide 200 may include indicia and/or cooperating features to facilitate positioning the first and second alignment features 202 in desired and/or predetermined relationships relative to one another.
According to one embodiment the second alignment feature 204 may include a bore 208 extending therethrough. The drill guide 200 may be provided to position the bore 208 in predetermined relationship relative to the cutting system 10. According to one such embodiment the drill guide 200 may configured to provide a desired relationship between the bore 208 and the cutter 14 received in the cutter support 18 of the cutting system 10. For example, the drill guide 200 may be configured to align the bore 208 to have an axis that intersects the socket 38 of the cutter 14 at a desired angular relationship.
In one embodiment according to the present disclosure, the drill guide 200 may be coupled to the cutting system 10 to orient the bore 208 of the second alignment feature 204 along an axis that may intersect the socket 38 of the cutter 14. With the drill guide 200 provided in such an arrangement, a drill bit (not shown) may be disposed extending through the bore 208 of the second alignment feature 204. Using the drill bit, a hole may be drilled through a portion of the femur 100, including the articular surface thereof, to expose the socket 38 of the cutter 14.
Turning now to
Referring to
The head portion 306 of the drive element may include a feature capable of being received in and capable of engaging the socket 38 of the cutter 14. In the illustrated embodiment, the head 306 may include a feature having a hexagonal cross-section. The hexagonal cross-section of the head 306 may be sized to be received in the socket 38 and to transmit torque from the drive element 302 to the cutter 14. The head portion 306 may have different configurations, such as cross-sectional geometry, to suit different specific sockets 38. Furthermore, the head 306 of the drive element 302 may be provided including a socket in a case in which the cutter 14 is provided having a protrusion rather than a socket.
According to one embodiment, the head portion 306 may be configured as a ball-drive feature, as shown in the illustrated embodiment. The ball-drive head portion may allow the drive element 302 to transmit torque to the cutter in situations in which the drive element 302 is not coaxially aligned with the socket 38 and/or the cutter 14. As shown, a ball-drive head may include a generally rounded or spherical feature when viewed in profile. The rounded aspect of the ball-drive head portion 306 may allow the drive element 302 to pivot within the socket 38 generally about a center of the ball of the head portion 306. In such a manner, when torque is transmitted to the cutter 14 via the drive element, the ball-drive head portion 306 in combination the socket 38 may perform in a manner similar to a universal, or flex, joint between the cutter 14 and the shaft portion 304 of the drive element 302. Accordingly, utilizing a ball-drive head portion 306, while not necessary, may increase the acceptable tolerance relative to the alignment of the drive element 302 and the socket 38 and/or cutter 14.
In the illustrated embodiment, the ball-drive head portion 306 is shown having a diameter that is larger than the diameter of the shaft portion 304. This configuration may allow the drive element 302 to transmit torque to the cutter 14 even when the drive element 302 is out of alignment with the axis of the cutter 14. In some cases the drive element 302 may be able to transmit torque to the cutter 14 up to an angle at which the shaft portion 302 begins to bind or drag against an upper edge of the socket 38, e.g., the chamfered upper edge 40.
In another embodiment, the shaft portion 304 of the drive element may have a diameter that is equal to, or greater than, the head portion 306 of the drive element 302. According to such an embodiment, it may still be possible to provide the drive element 302 including a ball-drive head portion 306, thereby allowing a margin or misalignment between the drive element 302 and the cutter 14. When the shaft portion 304 is provided having a diameter equal to or greater than the head portion 306, the head portion 306 may be provided having a ball-drive configuration by providing a neck disposed between the shaft portion 304 and the head portion 306. The neck may include a region having a smaller diameter than the shaft portion 304 or the head portion 306. The neck may include a transition region extending between the region having a smaller diameter and each of the shaft portion 304 and the head portion 306. The neck may allow some misalignment between the drive element 302 and the cutter 14 by allowing the ball-drive head portion 306 to rotate in the socket 38 without the shaft portion 304 of the drive element 302 binding against and edge of the socket 38.
As shown in
After an implant site 400 having a desired depth has been excised, the cutter 14 may be extracted. In an embodiment the cutter 14 may be extracted by withdrawing the cutter 14 back into the opening 20 of the cutter support 18. The cutter 14 may then be withdrawn from the joint site by extracting the cutting system 10, including the cutter 14, cutter support 18, and shaft 12, as a single unit. The cutter 14 may be withdrawn back into the opening 20 of the cutter support 18 using, for example, a pick that may be manipulated extending through the hole 300 previously created extending through at least a portion of the femur. The pick may pull the cutter 14 upwardly from the implant site 400 and into the cutter support. According to one embodiment, the drive element 302 may be employed to withdrawn the cutter 14 into the cutter support 18. In such an embodiment, the drive element 302 may be provided with a means for releasably retaining the cutter 14. The drive element 302 may include, for example, an extendable feature from the head portion 306 capable of releasably retaining the cutter 14. In an embodiment of the cutting system 10 including a biased shoe 24, the shoe 24 may first be withdrawn into a retracted position before the cutter 14 is withdrawn into the cutter support 18.
According to another embodiment, the cutter support 18 may first be withdrawn from the joint site. The cutter 14 may then be extracted from the implant site 400. In one such embodiment, the cutter 14 may be extracted using, for example, a pick or other retraction device operating between the articular surfaces of the femur 100 and tibia 102. Additionally, or alternatively, a retraction device operating through the hole 300 previously created extending through at least a portion of the femur may be used to extract the cutter 14 from the implant site 400, and from the joint site.
Referring to
The drill guide 200b may also include a second alignment feature 204b coupled in a desired relationship to the first alignment feature 202b by a support structure 206b extending between the first alignment feature 202b and the second alignment feature 204b. As in the illustrated embodiment, the support structure 206b may be configured as a continuous arc formed from a single piece. According to alternative embodiments, the support structure 206 may include adjustment features that enable the relationship between the first alignment feature 202b and the second alignment feature 204b to be varied. The adjustment features may include indicia or cooperating features that enable the first alignment feature 202b and second alignment feature 204b to be positioned in a desired predetermined relationship to one another. Furthermore, the support structure 206b may be formed from generally straight components and/or components having both straight and arcuate regions.
Similar to the previous embodiment, the second alignment feature 204b may include a bore extending through the second alignment feature 204b. The bore 208b may be adapted to receive a drill bit (not shown) or similar tool therethrough. The bore 208b of the alignment feature may be provided to position the drill bit in a desired orientation relative to the cutting system 10b. According to one embodiment, the drill guide 200b may be configured to position a drill bit to intersect the cutter support 18b in a central region and aligned generally normal to the cutter 14b. As with the previous embodiments, the bore 208b of the second alignment feature 204b may also be adapted to rotatably receive a drive element therethrough. In use, the drill guide 200b may be coupled to the cutter system 10b such that the second alignment feature 204b may be positioned to intersect a central region of the cutter support 18b along an axis that is generally normal to the cutter 14b.
With further reference to the enlarged view of
With the hole 300b providing access through the tibia 102b to the socket 38b of the cutter 14b, a drive element including a drive shaft 304b and a drive head 306b may be inserted through the second alignment feature 204b of the drill guide 200 and through the hole 300b in the tibia 102b. A proximal end of the drive shaft 304b may be adapted to be engaged by a driver (not shown), such as a drill. The drive head 306b may be adapted to be received in the socket 38b of the cutter 14b. The drive head 306b may also be adapted for transmitting torque through from the drive shaft 304b to the cutter 14b. For example, the drive head 306b and socket 38b may each have a polygonal profile, such as a hexagonal profile. Alternatively, the ball drive 306b and the socket 38b may include features such as flats, splines, keys, etc. to facilitate the transmission of torque from drive shaft 304b to the cutter 14b.
In addition to the torque transmitting features of the drive head 306b and the socket 38b, the drive head 306b and the socket 38b may include cooperating locking features. The locking features herein may operate to selectively prevent axial extraction of the drive head 306b from the socket 38b. Consistent with the illustrated embodiment, the locking feature may include an indentation 308 in the drive head 306b. The indentation 308 may be configured as a recess or opening in the outer circumference of the drive head 306b. According to alternative embodiments, the indentation 308 may include, for example, a groove around the exterior of the drive head 306b. The cutter 14b may include a cooperating detent (not shown) for engaging the indentation in the drive head 306b. According to an embodiment herein, the cutter 14b may include a radial opening 42. The opening 42 may house a plug (not shown) such as a cylindrical member, a ball, etc. that may be biased, e.g., by a spring, toward the interior of the socket 38b. Consistent with such an arrangement, when the drive head 306b is inserted into the socket 38b the plug may be radially displaced toward the circumference of the cutter 14b. Once the drive head 306b has been inserted into the socked 38b such that the indentation 308 is generally aligned with the opening 42, the biased plug may move toward the center of the cutter 14b and a portion of the plug may engage the indentation 308 in the drive head 306b. According to such an embodiment, the drive head 306b may be releasably engaged with the cutter 14b and resist axial extraction of the drive head 306 from the socket 38b until an extracting force is applied to the drive head 306b sufficient to overcome the bias on the plug and force the plug toward the circumference of the cutter 14b. Various other locking features and mechanism may also be employed for releasably engaging the drive head 306b in the socket 38b.
The drive shaft 304b and/or the drive head 306b may also include features that permit engagement between the drive head 306b and the socket 38b even in the event of a slight to moderate misalignment between drive shaft 304b and the cutter 14b. As in previous embodiments, the drive head 306b may include a ball drive configuration. As discussed above, a drive ball configuration of the drive head 306b may allow the connection between the drive head 306b and the socket 38b to operate in a manner similar to a universal joint. Similarly, the drive shaft 304b may include a flexible section, for example, disposed adjacent the drive head 306b. Other similar features may also be employed.
Consistent with the foregoing, once the drive head 306b is received in the socket 38b and axially locked in the socket 38, an implant site may be excised in an articular surface of the tibia 102b using the cutter 14b. A driver, for example a power drill, may be used to rotationally drive the cutter 14b via the drive shaft 304b and drive head 306b engaged in the socket 38b. As the cutter 14b is being rotationally driven by the driver, an axially withdrawing force may be applied to the drive shaft 304b urging the cutter 14b into the articular surface being excised, e.g. an articular surface of a tibia in the illustrated embodiment. The locking feature coupling the drive head 306b to the socket 38b may prevent the drive head 306b from being extracted from the socket 38b, and therefore allow the axially withdrawing force applied to the drive shaft 304b to be transmitted to the cutter 14b, and thereby urge the cutter into the articular surface. From a general standpoint, the cutter 14b is being rotated and pulled into the articular surface.
The cutter 14b may be driven until the articular surface has been excised to a desired depth. The depth of the excised site may be monitored and/or checked using a variety of techniques. On such technique is simple observation at the articular surface, e.g., viewing through the cutter support 18b. A biased shoe may also be used to monitor the depth of the excision. That is, the cutting system 10b may include a shoe biased toward a position extending inwardly into the cutter support 18b, wherein movement of the shoe to an extended position may be impeded by the cutter 14b. When the excision depth is sufficient that the cutter 14b is below the shoe, the shoe may move inwardly to an extended position. The movement and/or the position of the show may be visibly perceptible, and/or may be coupled to an indication system providing visible and/or audible indication that the shoe has moved to an extended position. According to still another embodiment, the drive shaft 304b and/or the second alignment feature 204b may include indicia representative of the position of the cutter 14b when the drive head 306b is received in the socket 38b of the cutter 14b. As the articular surface is excised and the cutter moves into the articular surface the drive shaft 304b may be extracted from the second alignment feature 204b a corresponding distance. The depth of the excised site may, therefore, be determined by reference to the amount the drive shaft 304b is withdrawn.
Referring to
With reference to
As shown in
While the foregoing description of the embodiments of cutting systems, drill guides, and associated methods have been described with reference to excising a portion of an articular surface of a tibial condyle, the disclosed systems and methods may suitable be applied to various other articular surfaces. The specific embodiments should, therefore only be construed as illustrative but not as limiting.
With reference to
As shown, the implant 500 may be configured as a generally cylindrical member capable of being received in an implant site, e.g. implant site 400, defined by an excised portion of bone disposed on an articular surface, for example created using previously described cutting system 10, drill guide 200, and associated methods. The top surface 512 of the implant 500 may be contoured to generally correspond to a geometry of an articular surface being replaced by the implant 500. Additionally, or alternatively, the top surface 512 of the implant 500 may have a contour generally corresponding to, or complimenting, a geometry of a cooperating articular surface or of an implant provided to replace at least a portion of a cooperating articular surface. As used in any embodiment herein, a contour generally corresponding to a portion of an articular surface being replaced may mean that the contour may provide similar mechanical action in relation to a cooperating articular surfaces, soft tissue, etc during articulation of the joint. Similarly, a contour generally corresponding to a cooperating implant or articular surface shall mean a contour providing smooth cooperating action with respect to such cooperating articular surfaces and/or implants. In any of the foregoing embodiments, the contour of the top surface 512 of the implant 500 may be provided based on quantitative and/or qualitative reference to none, any, all, or any combination of the portion of the articular surface being replaced by the implant 500, the articular surface receiving the implant, the geometry of a cooperating implant, and/or the geometry of a cooperating articular surface.
According to an embodiment, the top peripheral edge 514 of the implant 500 may be relieved. For example, the peripheral edge 514 may be relieved by providing a chamfer or round transition between the top surface 512 and an upper portion of the sidewall 516 of the implant 500. According to one aspect, relieving the peripheral edge 514 in such a manner may reduce the occurrence of a hard edge that may scrape a cooperating implant or articular surface. Relieving the top peripheral edge 514 may accommodate manufacturing or installation tolerances. In a situation in which an edge formed by a projection of the top surface 512 and the upper portion of the sidewall 516 would be slightly recessed or stand slightly proud relative to a surrounding articular surface, the relieved peripheral edge 514 of the implant 500 may still allow smooth movement of a cooperating implant or articular surface across the interface between the surrounding articular surface and the implant 500, notwithstanding such a slight misalignment. As illustrated in
With further reference also to
In a similar manner as the top surface 512, the implant 500 may include a relieved edge 522 between the bottom surface 518 and a lower portion of the side wall 516. As described with respect to the relieved transition of the upper peripheral edge 514, the relieved edge 522 may be provided, for example having, as a chamfer or a rounded over region. The relieved edge 522 may facilitate installation of the implant 500 by allowing a slight initial misalignment between the implant 500 and an implant site 400 into which the implant 500 is being installed. As the implant 500 is installed into the implant site 400 the relieved edge 522 may bear against the articular surface 528 defining the perimeter of the implant site 400 and allow the implant 500 to slide on the relieved edge 522 into proper alignment with the implant site 400. As the implant 500 is further inserted into the implant site 400 the conformance between the cylindrical sidewall 516 and the corresponding circular cross-section implant site 400 may draw the implant 500 into proper alignment with respect to the implant site 400. Furthermore, the relieved edge 522 may provide a volume for accommodating excess bone cement displaced from a central region of the implant site 400 if the implant 500 is bedded down into a layer of bone cement provided between the bottom of the implant site 400 and the implant 500. The relieved edge 522 may also allow the implant 500 to be fully seated in an implant site that may not have a sharp corner between the sidewall and bottom of the implant site.
The side wall 516 of the implant 500 may include one or more circumferential grooves 524. The circumferential groove 524 may provide an additional site for enhanced adhesion and/or mechanical lock between the implant 500 and a sidewall of an implant site 400. For example, bone cement may be applied in the groove 520 and/or to the sidewall of the implant site 400. When the implant 500 is installed in the implant site 400, bone cement may accumulate in the groove 520 and in contact with the side wall of the implant site 400. When the bone cement solidifies a protrusion of bone cement may be formed extending between the side wall of the implant site 400 and the circumferential groove 520 that may resist extraction of the implant 500 from the implant site 400. According to another aspect, the groove 520 may facilitate handling of the implant 500, especially as the implant 500 is inserted through an incision provided for installation of the implant 500, and/or as the implant 500 is installed into the implant site 400. For example, a tool may be provided having features sized to be received in the groove 520 and having a handle to allow manipulation by a clinician. Accordingly, it may be possible to manipulate the implant 500 by tilting the implant 500 as well as translating the implant 500 transversely and axially.
The implant 500 may be provided having features capable of promoting the ingrowth of bone to promote retention of the implant 500 in the implant site 400. For example, the grooves 500 on the bottom surface 518 and/or the circumferential grooves 524 may allow and/or promote the ingrowth of bone. Additional and/or alternative features not illustrated herein may also be provided to promote and/or allow the ingrowth of bone to promote retention of the implant 500 in the implant site 400.
An implant 500 consistent with the present disclosure may be formed from a variety of materials selected for various mechanical, physical, and biological properties. For example, the implant material may be selected to provide at least some degree of shock absorption or cushioning effect. Suitable materials may include various biocompatible polymeric materials, for example, high density polyethylene, ultrahigh molecular weight polyethylene, polyurethane, polyhydroxy-ethyl methacrylate gel, silicone, polyvinyl alcohol gel, etc. Ceramic material such as alumina or zirconia based materials, as well as various metallic materials, such as stainless steel, titanium, cobalt-chromium alloys, etc, may be used to provide an inherent lubrication or low friction surface. Additionally, the implant 500 may include materials that release or produce therapeutic or lubricating products and may even include biological materials. Numerous other materials provided the foregoing characteristics, and/or other desired characteristics, may be used to produce an implant 500 consistent with the present disclosure.
As alluded to above, the implant 500 may be used in connection with an implant site 400 created using a cutting system 10, drill guide 200 and the associated methods for excising an articular surface to create an implant site 400. As also alluded to, the implant 500 may be installed in the implant site 400 by orienting the implant 500 above the implant site 400 and inserting the implant 500 into the implant site 400 in a generally axial manner.
According to one particular embodiment, the support member 12 may be used to install the implant 500. The implant 500 may be received in the opening 20 of the support 18. The implant 500 may be retained in the opening 20 by a radial pressure applied by the shoe 24, or by the inner shaft received in the lumen of the shaft 16. As described with reference to the cutting operation, installation of the implant 500 may include at least partially opening the joint to facilitate access to the implant site 400 created in an articular surface. The implant 500 may then be delivered to the implant site 400 using the support member 12. The implant 500, retained in the cutter support 18, may be inserted between the cooperating articular surfaces of the femur 100 and tibia 102 and brought into general alignment with the implant site 400. When the implant 500 has been delivered to a desired location, the implant 500 may be released from the support member 12, for example, by withdrawing the translating shaft disposed in the lumen of the shaft 16, and thereby releasing the radial pressure on the implant 500.
Once the implant 500 has been delivered to the implant site, the implant 500 may be pressed into the implant site 400, for example, in part using the circumferential groove 524 for gripping and/or manipulating the implant 500. Bone cement may be applied to the implant 500 and/or the implant site 400. As with the excising operation, installing the implant 500 may be accomplished without damaging or removing the meniscus by retracting the meniscus to one side to expose and provide access to the implant site 400.
The present disclosure also provides a system for replacing a portion of an articular surface extending around a portion of a curvature of the articular surface with an implant. The articular surface replacement system according to this aspect of the disclosure may allow a greater area of an articular surface to be replaced and therein providing a replacement articular surface about a greater range of motion of a joint. Consistent with one embodiment, the system according to this aspect of the disclosure may be used to replace a portion of an articular surface of a femur in a uni-compartmental joint replacement. Consistent with the present system, a relatively large portion of an articular surface may be replaced by an articular surface implant while removing a relatively small mass of articular cartilage, subchondral bone, etc. By removing a relatively small mass of articular cartilage and subchondral bone, the joint may be susceptible to later, more aggressive replacement therapies. Furthermore, a portion of the articular surface may be replaced with a minimum of collateral damage, e.g., to surrounding tissue, ligaments, etc.
The system herein may generally include forming an implant site on the portion of the articular surface to receive the implant. The implant site may generally be formed by a plurality of overlapping excision sites. The system may generally include establishing an axis for each excision site. According to one embodiment, all of the axes may intersect at a common point. The plurality of excision sites may then be formed by excising a portion of the articular surface and subchondral bone extending inwardly from the articular surface along each respective axis. As mentioned above, each of the excision sites may at least partially overlap with an adjacent excision site. The plurality of excision sites may, therefore, provide a generally continuous implant site on the articular surface. An articular surface implant may be installed into the implant site.
Consistent with one embodiment, the system herein may be used to replace a portion of an articular surface of a femur, as during a uni-compartmental knee joint replacement. With reference to
With reference to
Referring to
With further reference to
According to one embodiment, a reference axis extending through the articular surface 612 may first be established. According to one embodiment, the reference axis may be provided extending generally normal to the articular surface 612. The reference axis may be established using a normal axis drill guide including a shaft and an aiming feature for projecting a reference axis and a plurality of articular surface contacting features for orienting the axis relative to the articular surface. Such a device is known in the art, for example from U.S. Pat. No. 6,610,067. Other devices may also suitably be used for establishing a reference axis.
In one embodiment, the reference axis may be established in the region of a defect 618 in the articular surface 612, although the reference axis may suitably be provided in locations on the articular surface 612. A guide pin may be inserted into the articular surface 612 along the reference axis, for example by providing a relatively small diameter hole in the articular surface 612 and inserting the guide pin into the hole. A larger hole may then be formed extending along the reference axis. According to one suitable method, the guide pin may be received in a lumen of a cored, or cannulated, drill bit. The cored drill bit may be used to form a pilot hole centered on the guide pin and extending into the articular surface 612.
The drill guide 600, described with reference to
According to one embodiment, using the drill guide 600 to establish additional working axes may include installing a location element in the hole produced along the reference axis. The location element may include, for example, a self tapping screw 100
The drill guide 600 may be coordinated with the location element installed through the articular surface 612 so that the drill bushing 606 may be oriented coaxial with the reference axis defined by the location element. For example, a guide rod may be fitted extending from the location element, and the guide rod may be received through a drill bushing, e.g. 606, of the drill guide 600. According to such an embodiment, the guide rod and the location element may be provided having mating features, such as mating precision tapers. The guide rod may, therefore, be aligned along the reference axis. Alternatively, the drill guide 600 and the location element may include cooperating features allowing the drill guide 600 and location element to be coordinated, e.g. aligned, positioned, etc., in a predetermined manner. The boss 610 extending from the drill guide body 602 may bear against, or otherwise interact with, the location element to position the drill guide 600 at a predetermined height relative to the articular surface 612, based on the height of the location element relative to the articular surface 612.
According to a related alternative embodiment, the drill guide 600 may be indexed, or positioned, on the articular surface 612 without the use of a location element. Consistent with one such embodiment, a working axis relative to the articular surface 612 may be established may be established, for example as described above. Also as above, a hole may be drilled into the articular surface 612 generally along the working axis. The boss 610 projecting from the body 602 of the drill guide 600 may be at least partially received in the hole drilled into the articular surface 612. The respective sizes of the hole and the boss 610 may be coordinated to achieve a predetermined tolerance and control the amount of movement, or slop, of the drill guide 600 relative to the articular surface 612. In one embodiment, a snug fit may be achieved between the boss 610 and the hole, thereby restricting movement of the drill guide relative to the articular surface 612.
With the drill guide 600 located relative to the reference axis extending through the articular surface 612, a working axis, or additional axes 614, 616, may be established relative to the articular surface 612. The working axis, or working axes 614, 616, may be established by drilling holes into the articular surface 612 guided by the drill bushing 614. Accordingly, the position and orientation of the working axes 614, 616 may be generally based on reference axis. While the illustrated drill guide 600 only provides two drill bushing 614, 616, additional drill bushings may be provided to allow implant sites of various sized to be formed. Furthermore, consistent with some embodiments, the reference axis used for positioning the drill guide 600 relative to the articular surface 612 may also provide a working axis, e.g., working axis 616.
According to one embodiment, a location element may be installed into each of the holes provided using the drill guide 600. The location elements installed through the articular surface may, therefore, provide a reference, and/or define, the working axes 614, 616 established using the drill guide 600. As used herein, it is not necessary for a location element to extend along the working axis 614, 616 in order for the location element to define the axis. Rather it is only necessary that the location element, or a feature thereof, be oriented in a predetermined relationship to the working axis. Depending upon the initial size of the holes drilled using the drill guide 600, installing a location element may include enlarging the holes to a predetermined size. Enlarging the holes may, in turn, include, for example, installing a guide pin into the holes and drilling over the guide pin using a cored or cannulated drill bit. Other techniques may also suitably be employed consistent with this aspect.
The location elements may include screws, such as self tapping screws. The location elements may be installed having a predetermined depth relative to the articular surface 612. For example, similar to the previously discussed technique, a positioning insert may be associated with the location elements, and the height of the height of the elements may be adjusted to place the positioning insert at a predetermined height relative to the articular surface 612. According to one embodiment, the location elements may include features, such as tapered openings, etc., that may allow cooperating elements and instruments to be placed in a desired position and/or alignment relative to the location element and/or the working axis 614, 616 defined thereby.
Installing location elements in each of the holes provided using the drill guide 600 may be accomplished by articulating the joint to sequentially provide axial access to each of the respective sites. Accordingly, it may not be necessary to separate the joint in order to install an implant on the articular surface 612 of one of the articulating elements. For example, a first site, e.g. a hole in the articular surface 612 drilled along a first axis 616 using the drill guide 600, may be axially access, for example through an incision, by articulating the joint so that the desired site is accessible through the incision. With the first site accessible through the incision, a location element may be installed in the hole. The joint may then be articulated to bring a second site, e.g. a hole in the articular surface 612 drilled along the second axis 614, in to a position whereby the second site may be accessed through the incision. Accordingly, with the second site accessible through the incision a locating element may be installed in the second hole. The process of articulating the joint to permit access to different sites on the articular surface may allow the procedure to be carried out in a minimally invasive manner. That is, rather than providing an incision sufficient to access the entire articular surface at one time, the size of the incision may be reduced. Furthermore, by accessing various portions of the articular surface 612 by positioning the joint in various articulated arrangements, the procedure may be carried out without completely separating the joint. Therefore, the amount of damage to surrounding tissue may be reduced, however, these aspects are not essential within the context of the present disclosure.
Once the working axes 614, 616 have been established, portions of the articular surface 612 and underlying subchondral bone may be excised to provide excision sites. For a first excision site, e.g., along the working axis 616, the joint may be articulated to position the site to permit access as through an incision. With the articular surface 612 positioned to provide access to the site, a portion of the articular surface may be excised. According to one embodiment, the articular surface may be excised using a drill, rotating cutter, or other instrument for excising a generally circular region of the articular surface and/or subchondral bone. Consistent with an embodiment employing a location element associated with each excision site, the location element may include a feature to facilitate locating the excision site and/or controlling the depth of the excision site.
According to a specific embodiment, the location element may include a precision tapered socket. A guide rod having a mating precision taper may be installed into the precision tapered socket. A cutting instrument including a cutting blade configured to rotate around the guide rod may be used to excise a portion of the articular surface 612 and subchondral bone around the working axis 616 to provide a first excision site. For example, a cutting blade, or more than one cutting blades, may be provided extending from a cannulated shaft. The cannulated shaft may be sized to be rotatably received over the guide rod. The first excision site may be provided by rotatably driving the cannulated shaft, and thereby driving the cutting blade or blades, about the guide rod. Consistent with this embodiment, the cutting blade or blades may travel a circular path centered on the working axis 616. As such, the cutting instrument may provide a first excision site defined within the circular path of the cutting instrument and centered on the first working axis 616. In one embodiment, the depth of the excision site may be controlled by providing cooperating features on the cutting instrument and the location element. For example, the cutting instrument may have a surface that may contact a surface on the location element when the cutting blade, or cutting blades, have achieved a predetermined depth relative to the location element. According to an alternative embodiment, the guide rod and or the cutting instrument may include indicia representative of a cutting depth. According to such an embodiment, the depth of the first excision site may be controlled with reference to such indicia.
Depending upon the diameter of the cutting path defined by the cutting blade or blades, at least a portion of the cutting path defined by the sweep of the cutting instrument may extend outside of the width of the condyle at the excision site. Accordingly, the first excision site may be provided having a truncated circular, or an elongated shape. That is, the first excision site may have a first dimension that may be generally defined by the diameter of the cutting path. The first excision site may also have a second dimension that is generally defined by the width of the condyle within the cutting path at the excised depth.
After the first excision site has been formed, the joint may be articulated to a position allowing a second site may be accessed. According to one embodiment, the joint may be articulated to a position allowing the second site to be accessed through the same incision that was used to access the first site. Similar to the process for forming the first excision site, a second excision site may be formed generally centered on a second working axis 614 by providing a cutting instrument that may be located relative to a second location element. For example, the location element may include a precision taper socket and a guide rod having a precision taper at one end may be received in the precision taper socket of the location element with the guide rod generally extending along the second working axis 614. The cutting instrument may include one or more blades rotatably associated with the guide rod, e.g. via a cannulated shaft of the cutting instrument, such as used to provide the first excision site. The cutting instrument may, therefore, be employed to provide a circular cutting path centered on the second working axis 614. Similar to the process for forming the first excision site, the cutting instrument may be rotatably driven about the guide rod, thereby defining a second excision zone within the circular cutting of the cutting instrument. The depth of the second excision site may be controlled, e.g. by an interaction between the cutting instrument and the location element, by reference to indicia on the cutting instrument and/or the guide rod, etc.
Also similar to the first excision site, according to one embodiment, at least a portion of the cutting path or excision region defined by the sweep of the cutting instrument may extend outside of the width of the condyle. Accordingly, the second excision site may be provided having a truncated circular or elongated shape having a dimension defined by the diameter of the cutting path and a second dimension defined by the width of the condyle within the cutting path at the excised depth.
Consistent with the system according to the present disclosure, the cutting paths defining the first and second excision sites may intersect, or at least partially overlap one another. The intersection or partial over lapping of the first and second excision sites may provide a generally continuous excised region. The continuous excised region may at least partially define an implant site in the articular surface 612. According to one embodiment, the first and second excision sites may overlap to a degree wherein one dimension of the continuous excised region may be generally defined by the width of the condyle at the excised depth.
The general procedure of forming an excision site using a cutter having a circular cutting path centered about a working axis defined, e.g., by the drill guide 600, may be carried as many times as necessary to create an implant site having the desired size, shape, and expanse. As with the first and second excision sites, each excision site may intersect, or at least partially overlap adjacent excision sites. The plurality of excision sites may, therefore, provide an implant site that includes a plurality of individual excision sites. As with the first and the second excision sites, at least a portion of the cutting path defining any of the additional excision sites may extend outside of the width of the condyle, thereby providing truncated circular, or an elongated, excision sites, in which one dimension of the excision site may be defined by the width of the condyle within the cutting path at the excised depth.
Consistent with an alternative embodiment, the plurality of intersecting, or at least partially overlapping, excision sites may be formed without the use of location features. According to one such embodiment, a plurality of working axes 614, 616 extending through the articular surface 612 may be defined, for example using the drill guide 600. The plurality of working axes 614, 616 may be defined, e.g., by holes drilled into the articular surface 612 with the aid of the drill guide 600. According to one embodiment, a guide pin or guide rod 102,
An implant may be installed in the implant site at least partially defined by the plurality of intersection or at least partially overlapping excision sites. Accordingly, the implant may replace at least a portion of the articular surface 612. In one embodiment, one or more of the location elements may be retained in the subchondral bone after the excision sites have been formed. The location elements may, therefore, be used as fixation elements for retaining the implant in position in the implant site. For example, in an embodiment in which the location elements include precision tapered socket, the implant may include a fixation feature including a precision tapered post that may be sized to be received in a precision tapered socket of the location element. The tapered post fixation feature of the implant may be pressed into the tapered socket to provide a secure frictional engagement therebetween. Alternative methods and features may also, or alternatively, be used for securing an implant in an implant site.
Turning to
As shown, an embodiment of the implant 700 may generally include a top, or bearing, surface, generally indicated at 702, and a bottom, or bone facing, surface, generally indicated at 704. The bearing surface 702 may be a surface that may replace a portion of an articular surface receiving the implant 700. As such, the bearing surface 702 may generally face a cooperating articular surface and/or an implant disposed in or a cooperating articular surface. The bone facing surface 704 may face the bone underlying the articular surface being replaced by the implant 700. In some embodiments herein, the bone facing surface 704 may be at least partially received in an implant site.
In the context of an implant suitable for replacing a portion of the articular surface of a femoral condyle in a uni-compartmental knee replacement, the arcuate expanse of the bearing surface 702 may be such that a portion of the bearing surface may be tangential with a first plane, and another portion of the bearing surface may be tangential with a second plane that is generally perpendicular to the first plane. The arcuate expanse of the bearing surface 702, however, may be varied to suit specific applications, and the foregoing description should not be construed as limiting on the scope of the implant 700 herein. Similarly, in context of an implant for replacing a portion of an articular surface of a femoral condyle, the implant 700 may have a width that may generally be defined by the width of the articular surface of the condyle. Accordingly, an embodiment of the implant 700 may generally have an oblong shape from the perspective of the bearing surface 702 in plan view. As such, the implant 700 may include rounded end regions 703, 705 generally. The sides extending between the end regions 703, 705 may be generally linear, or may be arcuate having a radius larger than the radius of the rounded end regions 703, 705.
According to one embodiment herein, at least a portion of the perimeter edge of the bearing surface 702 may be relieved and not present a hard edge. For example, at least a portion of the perimeter edge of the bearing surface 702 may be chamfered or rounded, for example as indicated at 707 in
As best seen in the schematic illustrations of
The implant 700 may also include one or more fixation features 706. The fixation feature 706 may facilitate securing the implant 700 in a desired position in an implant site. Consistent with the illustrated embodiment, the fixation feature 706 may be provided as protruding feature. According to one example, the fixation feature 706 may be provided as a precision taper. The precision taper may be adapted to be at least partially received in a mating precision taper or a cylindrical opening in a fixation element disposed in bone underlying the articular surface. For example a screw may provide a fixation element that may be disposed in the bone underlying the articular surface. The screw may include a central bore that is adapted to receive the fixation feature 706 of the implant 700.
According to alternative embodiments, the fixation feature 706 of the implant may include structures such as a barbed protrusion that may be pressed into a hole formed in the bone underlying the articular surface. The fixation feature 706 may be pressed into the hole and the barbed elements of the protrusion may engage the bone defining the wall of the hole. The engagement between the bone and the barbed elements may resist extraction of the implant 700 from the articular surface. In a similar embodiment, the fixation feature 706 may include a post having protrusion and/or indentations thereon. The implant 700 may be secured in a desired location by cementing the post into a hole formed in the bone underlying the articular surface. The protrusions and/or indentations may facilitate mechanical lock between bone cement and the fixation feature 706 of the implant 700. Various other structures, protrusions, receptacles, etc., may be used for securing the implant 700 in a desired location.
Consistent with an embodiment of the present disclosure, the implant 700 may be configured to have a bearing surface 702 that may approximate the geometry or curvature of the articular surface being replaced by the implant 700. In one embodiment the geometry of the load bearing surface may be based on the actual articular surface being replaced. For example, mapping techniques known in the art may be used to measure the actual geometry of the region of the articular surface being replaced. An implant 700 may then be constructed or selected from a set of implants having predetermined geometries to at least generally conform to mapped or measured geometry of the articular surface being replaced. Alternatively, an implant 700 for a specific application may be fabricated or selected from a set of standard sized/shaped implants to provide a general approximation of the articular surface being replaced. Selection or fabrication of an implant 700 may rely on various degrees of quantitative reference to the articular surface being replaced, including no quantitative reference to the articular surface.
Consistent with an alternative embodiment, the implant 700 may be configured to provide smooth interaction with a cooperating implant on a cooperating articular surface. Accordingly, the cooperating implant may not have a geometry approximating the geometry of the cooperating articular surface. In such a situation, rather than providing the implant 700 having a geometry approximating the articular surface being replaced, the implant 700 may have a contour or geometry that is configured to provide smooth interaction with the cooperating implant. In one such embodiment, the implant 700 and the cooperating implant may be provided as a pair and/or be provided having coordinated geometries selected to provide a desired, e.g., smooth, interaction with one another in an application in a particular joint or in general.
The schematic illustrations in
It should be noted that the overlapping implant portions 750, 752 need not exist as separate, discrete components, but may rather provided as a single unitary implant 700. Consistent with an alternative embodiment, the individual implant portions may be provided as separate components that may be assembled and/or arranged in the implant site to provide a generally continuous implant. When the bearing surfaces 754, 756 of the implant portions are faired, or lofted, to provide a smooth continuous surface, an implant 700 may be provided having a continuous bearing surface that may generally represent an original articular surface being replaced and/or provide smooth interaction about the range of motion of the implant 700 with a cooperating articular surface and/or cooperating implant.
Consistent with the previously described system for providing an implant site, each of the implant portions 750, 752 may have a shape, as viewed looking at the bearing surface 754, 756 of the implant, which may generally correspond to a shape of a respective excision site making up the implant site on the articular surface 612. In one embodiment the geometry of the load bearing surface 754, 756 of each implant portion 750, 752 may be based on the actual articular surface being replaced at each excision site. For example, mapping techniques known in the art may be used to measure the geometry of the actual articular surface being replaced in the region of the respective excision sites. The implant portions 750, 752 may have predetermined geometries to at least generally conform to a mapped or measured geometry of the articular surface being replaced in the region of each excision site. Alternatively, the implant portions may have a standard size/shape providing a general approximation of the articular surface being replaced. The geometry or contour of the implant portions 750, 752 may rely on various degrees of quantitative reference to the regions of the articular surface being replaced, including no quantitative reference to the articular surface.
Consistent with the foregoing, the implant portions 750, 752 may each be a truncated circular or oblong member, when viewed in plan view from the bearing surfaces 754, 756. By truncated circular or oblong it is meant that the implant portions 750, 752 may be derived, for example, from a circular implant having a diameter greater than the width of a condyle intended to receive the implant 700. The width of the implant, for example across the medial-lateral plane of the condyle, may be less than the length, i.e., along the anterior-posterior plane of the condyle. Accordingly, a circular implant may be truncated in the medial-lateral plane to have a width that is equal to the width of the condyle at the implant site. Alternatively, one or more of the implant portions 750, 752 may include a width, e.g., across the medial-lateral plane condyle, that is greater than the length of the implant portions 750, 752, e.g., along the anterior-posterior plane of the condyle. This situation may occur if the curvature of a condyle in the anterior-posterior plane is such that, for an implant having a desired thickness, the articular surface curves away from the excision site in the anterior-posterior plane in a smaller dimension than the width of the condyle. Accordingly, the implant portions 750, 752 may be truncated in the anterior-posterior plane. Further embodiments contemplate a truncated circular implant wherein the implant is truncated in a plane oriented at an angle to the anterior-posterior and medial-lateral planes. Additionally, it is contemplated herein that the truncated implant may be asymmetrical.
In addition to having a shape that may correspond to an excision site on an articular surface, the implant portions 750, 752 may overlap one another to the same degree that the respective excision sites overlap one another to form the implant site. Accordingly, the shape of an implant 700 composed of the implant portions 750, 752 may generally conform to an implant site including a plurality of excision sites.
While the illustrated implant 700 may be conceptually thought of as two angularly and/or radially displaced, overlapping truncated circular implant portions 750, 752, an implant accommodating a larger expanse may be conceptually provided by more than two overlapping truncated circular implant portions, each arranged angularly and/or radially displaced from one another. Similarly, various bearing surface contours may be developed, again conceptually, by providing a plurality of truncated circular or oblong implants of varying sizes and arranged at varying angular and/or radial displacements relative to the other truncated circular or oblong implant portions and corresponding to respective overlapping excision sites.
The foregoing design methodology may provide an implant 700 that may include an implant portion 750, 752 corresponding to each excision site in the articular surface formed to provide the implant site. Accordingly, the implant 700 may not only have a bearing surface that may approximate the geometry or contour of the portion of the original articular surface 612 being replaced, but the implant 700 may also include a bone facing surface 704 having a geometry that is adapted to be received in the implant site formed by a plurality of individual excision sites.
The foregoing disclosure relates to one possible conceptual methodology for designing an implant herein. However, various alternative design methodologies may also suitably be employed for designing an implant consistent with the present disclosure. Furthermore, the implant should not be considered to be limited by any particular design methodology by which such an implant is obtained. Accordingly, the disclosed embodiment of a design methodology for achieving an implant herein should not be construed as limiting the actual implant as disclosed.
Consistent with the foregoing design methodology, an implant 700 may be provided having a bearing surface approximating an articular surface to be replaced, each of the overlapping implant portions 750, 752 may be provided having a load bearing surface 754, 756 that may approximate the geometry or curvature of a region of the articular surface to be replaced by the respective regions of the implant 700 associated with each of the overlapping implant portions 750, 752. The geometry or curvature of the overlapping implant portions 750, 752 may be based on the articular surface being replaced, e.g. based on data collected using measuring or mapping techniques. Alternatively, the geometry or contour of the overlapping implant portions 750, 752 may be provided based on a general approximation of the respective regions of the articular surface being replaced. Herein, approximating the articular surface being replaced, and/or providing a bearing surface based on the articular surface being replaced, may rely on various degrees or quantitative reference to the articular surface being replaced, including no quantitative reference to the articular surface.
An implant 700 consistent with the present disclosure may be formed from any suitable biocompatible material. For example, an implant 700 may be formed, in whole or in part, from a metal or metal alloy, e.g. Co—Cr—W—Ni, Co—Cr-M, Co—Cr alloys, Co—Cr-Molybdenum alloys, Cr—Ni—Mn alloys, powder metal alloys, stainless steel, titanium and titanium alloys. Ceramic materials, such as aluminum oxide or zirconium oxide, may also suitably be used to form an implant herein. Polymeric materials may also be used to produce implant according to the present disclosure. For example, polyurethanes, polyethylene, ultra-high molecular weight polyethylene, thermoplastic elastomers, biomaterials such as polycaprolactone may all be used herein. Additionally, implants herein may be produced from diffusion hardened materials, such as Ti-13-13, Zirconium and Niobium. Coatings, or coated materials, may be employed to provide porous surfaces, e.g., on bone-contacting surfaces, hydrophilic surfaces, e.g., on load bearing surfaces. Furthermore, the present disclosure contemplates the use of composite implants that may include more than one material and/or may include more than one type of materials, for example, a metal or metal alloy and a polymeric material. Consistent with this last aspect, composite implants are contemplated herein that may include load bearing and/or bone facing surfaces that may include more than one material and/or more than one type of material.
This application is a continuation of U.S. patent application Ser. No. 13/752,858 filed Jan. 29, 2013, now U.S. Pat. No. 9,044,343, which is a continuation of U.S. patent application Ser. No. 11/169,326 filed Jun. 28, 2005, now U.S. Pat. No. 8,361,159, which claims the benefit of U.S. Provisional Patent Application Ser. No. 60/583,549, filed Jun. 28, 2004. U.S. patent application Ser. No. 11/169,326 is also continuation-in-part of U.S. patent application Ser. No. 10/994,453 filed Nov. 22, 2004, now U.S. Pat. No. 7,896,885, which claims the benefit of U.S. Provisional Patent Application Ser. No. 60/523,810, filed Nov. 20, 2003. U.S. patent application Ser. No. 11/169,326 is also continuation-in-part of U.S. patent application Ser. No. 10/308,718, filed Dec. 3, 2002, now U.S. Pat. No. 7,163,541, all of which are incorporated herein by reference.
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Number | Date | Country | |
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20160106444 A1 | Apr 2016 | US |
Number | Date | Country | |
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60583549 | Jun 2004 | US | |
60523810 | Nov 2003 | US |
Number | Date | Country | |
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Parent | 13752858 | Jan 2013 | US |
Child | 14728216 | US | |
Parent | 11169326 | Jun 2005 | US |
Child | 13752858 | US |
Number | Date | Country | |
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Parent | 10994453 | Nov 2014 | US |
Child | 11169326 | US | |
Parent | 10308718 | Dec 2002 | US |
Child | 10994453 | US |