Patent Application
20180008422
The present disclosure relates to a knee arthroplasty system.
This section provides background information related to the present disclosure, which is not necessarily prior art.
Knee arthroplasty typically calls for implanting either a partial (unicondylar) or a total arthroplasty device, depending on the condition of the patient's knee (i.e., the extent to which the knee has been damaged due to wear or trauma). Although existing partial and total knee devices and systems are often marketed under a common brand name, they do not share design elements. In other words, unicondylar and total arthroplasty devices and systems are designed independently from one another based on different anatomic data. As a result, the kinematics between the two systems is different, as is sizing rational and surgical technique, for example. This leads to inefficient use of implant inventory and instrumentation. There is thus a need for improved knee arthroplasty systems having enhanced efficiencies. For example, knee arthroplasty systems that provide a consistent approach to treating osteoarthritis, such as by providing multiple treatment options along one continuum, from unicondylar to bi-compartmental to tri-compartmental (total) replacement, would therefore be desirable. The present teachings provide for such advantages, as well as numerous others.
This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features.
The present teachings provide for an arthroplasty system including a unicondylar tibial tray implant, a total tibial tray implant, and a tibial bearing configured to individually couple with each one of the unicondylar tibial tray implant and the total tibial tray implant.
The present teachings further provide for an arthroplasty system including a unicondylar tibial tray implant having a unicondylar bearing engaging surface, and a total tibial tray implant having a medial bearing engaging surface and a lateral bearing engaging surface. The unicondylar bearing engaging surface is substantially similar to the medial or the lateral bearing engaging surfaces in size and shape.
The present teachings also provide for a unicondylar tibial tray implant, a total tibial tray implant, a tibial bearing, a unicondylar femoral implant, and a total femoral implant. The unicondylar tibial tray implant includes a unicondylar bearing engaging surface. The total tibial tray implant includes a medial bearing engaging surface, a lateral bearing engaging surface, and an intercondylar portion between the medial bearing engaging surface and the lateral bearing engaging surface. The unicondylar bearing engaging surface is substantially similar to the medial or the lateral bearing engaging surfaces in size and shape. The tibial bearing is configured to couple with the unicondylar tibial tray implant at the unicondylar bearing engaging surface, and configured to couple with the total tibial tray implant at one of the medial bearing engaging surface and the lateral bearing engaging surface. Each one of the unicondylar femoral implant and the total femoral implant are configured to articulate with the tibial bearing. Each one of the unicondylar tibial try implant, the total tibial tray implant, the tibial bearing, the unicondylar femoral implant, and the total femoral implant are sized and shaped based on the same anatomic data.
Further areas of applicability will become apparent from the description provided herein. The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.
The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.
Corresponding reference numerals indicate corresponding parts throughout the several views of the drawings.
Example embodiments will now be described more fully with reference to the accompanying drawings.
With initial reference to
The lateral unicondylar tibial implant assembly 10 generally includes a tibial bearing 12, a unicondylar tibial tray implant 14, and a locking member or locking bar 16. The tibial bearing 12 generally includes a unicondylar articulation surface 20, which is opposite to a unicondylar tray engaging surface 22. The articulation surface 20 is configured to articulate with either a unicondylar femoral component 510 (
With continued reference to
With reference to
With reference to
The unicondylar tibial tray implant 14 further includes an anterior end 64, which is opposite to a posterior end 66. Between the anterior end 64 and the posterior end 66 is a lateral side 68 and a medial side 70. The unicondylar tibial tray implant 14 includes a coupling system or portion 80, which can be any suitable coupling system or portion configured to couple the tibial bearing 12 thereto, or any other suitable unicondylar or total tibial bearing.
The coupling portion 80 in the example illustrated generally includes a raised portion 82, which generally extends across the medial side 70, across the posterior end 66, and across at least a portion of the lateral side 68. The raised portion 82 generally extends from the unicondylar bearing engaging surface 60, and defines a posterior coupling flange 84 at the posterior end 66. The posterior coupling flange 84 is configured to cooperate with the posterior coupling recess 46 of the lateral tibial bearing 12. At the lateral side 68, the raised portion 82 defines a lateral coupling flange 86, which is configured to cooperate with the lateral coupling flange 48 of the tibial bearing 12. The posterior coupling flange 84 and the lateral coupling flange 86 thus respectively retain the posterior end 26 and the lateral side 28 of the lateral tibial bearing 12 to the unicondylar tibial tray implant 14.
The coupling portion 80 of the unicondylar tibial tray implant 14 further includes an anterior locking post 90 proximate to the anterior end 64 and extending in the superior direction, such as away from the unicondylar bearing engaging surface 60. The anterior locking post 90 generally defines an outer recess 92 and an inner recess 94. The anterior locking post 90 is configured to couple with the locking bar 16 in order to secure the anterior end 24 of the tibial bearing 12 to the anterior end 64 of the unicondylar tibial tray implant 14. Specifically, when the tibial bearing 12 is seated on the unicondylar bearing engaging surface 60, the locking bar 16 is inserted through the anterior coupling recess 44 and into cooperation with the anterior locking post 90. A bearing engaging portion 96 of the lateral locking bar 16 extends through the anterior coupling recess 44 and into cooperation with the anterior locking post 90 at the inner recess 94 thereof. A locking post engaging portion or clip 98 of the lateral locking member 16 contacts and engages the outer recess 92 of the anterior locking post 90 in order to retain the locking bar 16 in cooperation with the anterior locking post 90.
With continued reference to
With additional reference to
The total tibial tray implant assembly 210 generally includes a lateral tray 212, a medial tray 214, and an intercondylar bridge portion 216, which is between and connects the lateral and medial trays 212 and 214. Extending from a bone engaging surface 218 can be any suitable retention member configured to facilitate retention of the total tibial tray implant assembly 210 to a tibia bone, such as one or more retention posts 220. The total tibial tray implant assembly 210 can be any suitable total tibial tray implant, such as a total tibial tray implant configured to accommodate a natural ACL in an intercondylar slot 240 defined between the lateral tray 212 and the medial tray 214.
The lateral tray 212 is substantially similar to the lateral unicondylar tibial tray implant 14. Therefore, features of the lateral tray 212 that are similar to, or the same as, features of the lateral unicondylar tibial tray implant 14 are designated with the same reference numerals, but include the suffix “A,” and the description of such features in conjunction with the unicondylar tibial tray implant 14 also applies to the lateral tray 212. The lateral tray 212 is illustrated as including the same coupling system or portion 80A as the lateral unicondylar tibial tray implant 14. However, the lateral tray 212 can include any other suitable coupling device, portion, or features to secure the lateral tibial bearing 12A thereto.
The lateral tray 212 includes a lateral curved outer tray surface 110A, which is substantially similar to, or the same as, the curved outer tray surface 110 of the lateral unicondylar tibial tray implant 14. Therefore, and with additional reference to
The medial tray 214 is a mirror image of, or substantially a mirror image of, the lateral unicondylar tibial tray implant 14 and the lateral tray 212. Therefore similar features are designated with the same reference numerals, but include the suffix “B.” The description of the similar or like features set forth above in the description of the lateral unicondylar tibial tray implant 14 and the lateral tray 212 also applies to the medial tray 214. The medial tibial bearing 12B is thus configured to couple with both the unicondylar medial version (not specifically illustrated) of the lateral unicondylar tibial tray implant 14, as well as the medial tray 214. The medial tibial bearing 12B can be coupled to the medial tray 214 with a medial locking member 16B, which is substantially similar to the lateral locking member 16A.
The medial tray 214 includes a curved outer tray surface 110B, which is substantially similar to a curved outer tray surface of the medial version of the unicondylar lateral tibial tray implant 14. The curved outer tray surface 110B is thus a mirror image of, or substantially a mirror image of, both the curved outer tray surface 110 of the unicondylar tibial tray implant 14, and the curved outer tray surface 110A of the lateral tray 212. The medial curved outer tray surface 110B includes, at illustrated in
As illustrated in
Although the total tibial tray implant assembly 210 is illustrated as including coupling systems or portions 80A and 80B, which are substantially similar to the coupling system or portion 80 of the lateral unicondylar tibial tray implant 14, the total tibial tray implant assembly 210 can include any other suitable bearing coupling system or portion suitable for retaining the lateral and medial tibial bearings 12A and 12B thereto that is compatible with the coupling system or portion 42 of the bearings 12A and 12B, or any other coupling system or portion that the bearings 12A and 12B may include.
With reference to
The lateral tray 312 is substantially similar to both the lateral tray 212 and the lateral unicondylar tibial tray implant 14, and is based on the same anatomic data. Therefore, common features are illustrated in
With reference to
The total tibial tray implant assembly 310 can include the same coupling system or portions 80A and 80B described above, or any other suitable coupling portions or system configured to secure the total bearing 410 at the lateral and medial trays 312 and 314. Likewise, the total bearing 410 can include any suitable coupling portion or system to secure the total bearing 410 at the lateral and medial trays 312 and 314. As illustrated in
With reference to
With reference to
With reference to
Opposite to the lateral bone engaging surface 620 is a lateral articulation surface 630. Opposite to the medial bone engaging surface 622 is a medial articulation surface 632. With particular reference to
When the unicondylar femoral component 510 is a lateral component, the medial to lateral width X of the articulation surface 512 can be the same as, or substantially similar to, the medial to lateral width X of the lateral articulation surface 630. When the unicondylar femoral component 510 is configured as a medial component, the articulation surface 512 can have a medial to lateral width X that is the same as, or substantially similar to, the medial to lateral width X′ of the medial articulation surface 632 of the total femoral component 610.
The present teachings thus provide for the lateral unicondylar tibial bearing 12/12A, the medial unicondylar tibial bearing 12B, the lateral articulation surface 20A, the medial articulation surface 20B, the lateral tray 212, the medial tray 214, the unicondylar femoral component 510, and the total femoral component 610 to be based on the same anatomic data, which is often complied based on measurements of a plurality of different knee joints from a statistically suitable segment of the population. This means that the same anatomic data and kinematics, such as femoral and tibial sizing, femoral and tibial orientation, inferior-superior translation, internal-external rotation, varus-valgus rotation, anterior-posterior translation, flexion-extension rotation, and medial-lateral translation, is used to design each one of the lateral unicondylar tibial bearing 12/12A, the medial unicondylar tibial bearing 12B, the lateral articulation surface 20A, the medial articulation surface 20B, the lateral tray 212, the medial tray 214, the unicondylar femoral component 510, and the total femoral component 610. Any particular anatomic data and kinematics can be used, as long as it is the same.
The present teachings provide for common sizing and design rationale across each tibial and femoral component. Any suitable number of sizes of the tibial and femoral components can be provided to fit a suitably wide segment of the population. For example, ten different sizes of each of the following components can be provided: lateral tibial bearings 12/12A; medial tibial bearings 12B; lateral unicondylar tibial tray implants 14; medial unicondylar tibial tray implants (not specifically illustrated); total bearings 410; total tibial trays 210; total tibial trays 310; unicondylar femoral components 510; and total femoral components 610. All of these femoral and tibial components are based on the same anatomic and kinematic data as described above. Therefore, the bearings 12/12A/12B of a particular size can couple with similarly sized tibial tray implants 14 and total tibial trays 210 and 310. The total bearing 410 of a particular size can couple with similarly sized total tibial trays 210 and 310. The unicondylar femoral component 510 and the total femoral component 610 can articulate with bearings 12/12A/12B and 410 of the same size. For example, the largest lateral tibial bearing 12A is configured to couple with the largest lateral unicondylar tibial tray implant 14, the largest lateral tray 212, and the largest lateral tray 312. The largest tibial bearing 12A also has a curved outer bearing surface 32 that is the same size and shape as the curved outer tray surface 110 of the largest lateral unicondylar tibial tray implant 14, and the same size and shape as the curved outer tray surface 11 OA of the largest total tibial trays 210 and 310. The largest unicondylar femoral component 510 is configured to articulate with the largest tibial bearing 12/12A/12B, as well as the largest total bearing 410. The largest total femoral component 610 is configured to articulate with the largest tibial bearing 12/12A/12B and the largest total bearing 410.
The total femoral components 610 have anterior geometry at the patellar track portion 612 that is consistent with a patellofemoral replacement device. All total femoral components 610 thus allow for use of the same patellar implant, thereby further reducing inventory and manufacturing costs. All femoral components can have the same sagittal profiles, which provides the same kinematic patterns, regardless of whether the ACL is retained or artificially replaced.
The common sizing rational of the present teachings provides numerous advantageous, such as inventory reduction and a seamless between implants during surgery and/or revision procedures, such as between unicondylar implants, ACL preserving, and ACL replacing implants. The present teachings thus advantageously provide for a consistent approach to treating osteoarthritis, which provides multiple treatment options along one continuum from unicondylar, to bicompartmental, to total knee replacement.
The present teachings also provide for multiple modular articulation surfaces for providing varying levels of constraint. For example, in addition to the total bearing 410 including the center guidepost 418 to provide enhanced constraint with the femoral component 610. Another total bearing 410 can be provided without the guidepost 418 to provide less constraint. On the femoral side, additional total femoral components 610 can be provided including an intercondylar portion or box, and/or a stem, which can provide further support for a fully constrained total femoral component.
The commonalities described above between the lateral unicondylar tibial bearing 12/12A, the medial unicondylar tibial bearing 12B, the lateral articulation surface 20A, the medial articulation surface 20B, the lateral tray 212, the medial tray 214, the unicondylar femoral component 510, and the total femoral component 610 also permit use of common instrumentation to prepare the femur and tibia regardless of whether a unicondylar or total knee arthroplasty is being performed. For example, the same instrument can be used to prepare a tibial plateau regardless of whether the tibia island is being retained or resected. Any suitable instrumentation can be used, such as the tibial cut guide and vertical wall guide of the Vanguard XP® instrument system by Biomet, Inc. Any suitable common instrumentation can also be used to perform posterior resection for the femoral condyles in preparation for implanting either the unicondylar femoral component 510 or the total femoral component 610.
Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.
The terminology used in this application is for the purpose of describing particular example embodiments only and is not intended to be limiting. The singular forms “a,” “an,” and “the” may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprises,” “comprising,” “including,” and “having,” are inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described are not to be construed as necessarily requiring their performance in the particular order discussed or illustrated, unless specifically identified as an order of performance. It is also to be understood that additional or alternative steps may be employed.
When an element or layer is referred to as being “on,” “engaged to,” “connected to,” or “coupled to” another element or layer, it may be directly on, engaged, connected or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being “directly on,” “directly engaged to,” “directly connected to,” or “directly coupled to” another element or layer, there may be no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). The term “and/or” includes any and all combinations of one or more of the associated listed items.
Although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as “first,” “second,” and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
Spatially relative terms, such as “inner,” “outer,” “beneath,” “below,” “lower,” “above,” “upper,” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the example term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.
This application claims the benefit of U.S. Provisional Patent Application Ser. No. 62/359,863, filed on Jul. 8, 2016, the benefit of priority of which is claimed hereby, and which is incorporated by reference herein in its entirety.
| Number | Date | Country | |
|---|---|---|---|
| 62359863 | Jul 2016 | US |
