Medial pivot total knee arthroplasty for valgus knees provides equivalent medial stability compared to that for varus knees: In vivo kinematic study
Abstract Purpose The efficacy of medial pivot total knee arthroplasty (MP TKA) in treating valgus knees that may cause medial instability is unknown. The purpose of this study was to investigate the in vivo kinematics of MP TKA for the valgus knees and compare them to those for the varus knees. Meth...
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| Format: | Article |
| Language: | English |
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Wiley
2024-10-01
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| Series: | Journal of Experimental Orthopaedics |
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| Online Access: | https://doi.org/10.1002/jeo2.70013 |
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| author | Tomofumi Kage Kenichi Kono Tetsuya Tomita Takaharu Yamazaki Shuji Taketomi Ryota Yamagami Kohei Kawaguchi Ryo Murakami Takahiro Arakawa Takashi Kobayashi Hiroshi Inui Sakae Tanaka |
| author_facet | Tomofumi Kage Kenichi Kono Tetsuya Tomita Takaharu Yamazaki Shuji Taketomi Ryota Yamagami Kohei Kawaguchi Ryo Murakami Takahiro Arakawa Takashi Kobayashi Hiroshi Inui Sakae Tanaka |
| author_sort | Tomofumi Kage |
| collection | DOAJ |
| description | Abstract Purpose The efficacy of medial pivot total knee arthroplasty (MP TKA) in treating valgus knees that may cause medial instability is unknown. The purpose of this study was to investigate the in vivo kinematics of MP TKA for the valgus knees and compare them to those for the varus knees. Methods The kinematics of 19 valgus knees and 19 varus knees operated in the MP TKA were investigated under fluoroscopy during squatting using a two‐ to three‐dimensional registration technique. Accordingly, the valgus and varus knees were evaluated and compared in terms of knee flexion angle, anteroposterior translation for the medial and lateral low contact points, axial rotation and valgus–varus angle of the femoral component relative to the tibial component, as well as kinematic pathways. Results The knee flexion angle was found to be identical in both knees. There was no anterior translation on the medial side of the valgus knees, and no difference was detected between the two knees. On the lateral side, posterior translation was observed in both knees, with no difference between the two. Femoral external rotation was observed in both knees, and no difference was detected between the two. There was no valgus–varus change in the valgus knees, nor was there a difference between the two knees. The valgus knees demonstrated MP motion, whereas the varus knees demonstrated MP motion and bicondylar rollback. Conclusion The medial side of the valgus knees treated with MP TKA showed comparable stable kinematics to the varus knees. The MP TKA is an effective procedure for valgus knees to stabilize the medial compartment. Level of Evidence Level Ⅲ. |
| format | Article |
| id | doaj-art-8cb6902d809b4fe780eb3e612d1cb4d3 |
| institution | DOAJ |
| issn | 2197-1153 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Experimental Orthopaedics |
| spelling | doaj-art-8cb6902d809b4fe780eb3e612d1cb4d32025-08-20T02:58:21ZengWileyJournal of Experimental Orthopaedics2197-11532024-10-01114n/an/a10.1002/jeo2.70013Medial pivot total knee arthroplasty for valgus knees provides equivalent medial stability compared to that for varus knees: In vivo kinematic studyTomofumi Kage0Kenichi Kono1Tetsuya Tomita2Takaharu Yamazaki3Shuji Taketomi4Ryota Yamagami5Kohei Kawaguchi6Ryo Murakami7Takahiro Arakawa8Takashi Kobayashi9Hiroshi Inui10Sakae Tanaka11Department of Orthopaedic Surgery, Faculty of Medicine The University of Tokyo Bunkyo‐ku Tokyo JapanDepartment of Orthopaedic Surgery, Faculty of Medicine The University of Tokyo Bunkyo‐ku Tokyo JapanGraduate School of Health Sciences Morinomiya University of Medical Sciences Osaka JapanDepartment of Information Systems, Faculty of Engineering Saitama Institute of Technology Fukaya Saitama JapanDepartment of Orthopaedic Surgery, Faculty of Medicine The University of Tokyo Bunkyo‐ku Tokyo JapanDepartment of Orthopaedic Surgery, Faculty of Medicine The University of Tokyo Bunkyo‐ku Tokyo JapanDepartment of Orthopaedic Surgery, Faculty of Medicine The University of Tokyo Bunkyo‐ku Tokyo JapanDepartment of Orthopaedic Surgery, Faculty of Medicine The University of Tokyo Bunkyo‐ku Tokyo JapanDepartment of Orthopaedic Surgery, Faculty of Medicine The University of Tokyo Bunkyo‐ku Tokyo JapanDepartment of Orthopaedic Surgery, Faculty of Medicine The University of Tokyo Bunkyo‐ku Tokyo JapanDepartment of Orthopaedic Surgery, Faculty of Medicine The University of Tokyo Bunkyo‐ku Tokyo JapanDepartment of Orthopaedic Surgery, Faculty of Medicine The University of Tokyo Bunkyo‐ku Tokyo JapanAbstract Purpose The efficacy of medial pivot total knee arthroplasty (MP TKA) in treating valgus knees that may cause medial instability is unknown. The purpose of this study was to investigate the in vivo kinematics of MP TKA for the valgus knees and compare them to those for the varus knees. Methods The kinematics of 19 valgus knees and 19 varus knees operated in the MP TKA were investigated under fluoroscopy during squatting using a two‐ to three‐dimensional registration technique. Accordingly, the valgus and varus knees were evaluated and compared in terms of knee flexion angle, anteroposterior translation for the medial and lateral low contact points, axial rotation and valgus–varus angle of the femoral component relative to the tibial component, as well as kinematic pathways. Results The knee flexion angle was found to be identical in both knees. There was no anterior translation on the medial side of the valgus knees, and no difference was detected between the two knees. On the lateral side, posterior translation was observed in both knees, with no difference between the two. Femoral external rotation was observed in both knees, and no difference was detected between the two. There was no valgus–varus change in the valgus knees, nor was there a difference between the two knees. The valgus knees demonstrated MP motion, whereas the varus knees demonstrated MP motion and bicondylar rollback. Conclusion The medial side of the valgus knees treated with MP TKA showed comparable stable kinematics to the varus knees. The MP TKA is an effective procedure for valgus knees to stabilize the medial compartment. Level of Evidence Level Ⅲ.https://doi.org/10.1002/jeo2.70013in vivo kinematicsmedial pivot total knee arthroplastyvalgus kneesvarus knees |
| spellingShingle | Tomofumi Kage Kenichi Kono Tetsuya Tomita Takaharu Yamazaki Shuji Taketomi Ryota Yamagami Kohei Kawaguchi Ryo Murakami Takahiro Arakawa Takashi Kobayashi Hiroshi Inui Sakae Tanaka Medial pivot total knee arthroplasty for valgus knees provides equivalent medial stability compared to that for varus knees: In vivo kinematic study Journal of Experimental Orthopaedics in vivo kinematics medial pivot total knee arthroplasty valgus knees varus knees |
| title | Medial pivot total knee arthroplasty for valgus knees provides equivalent medial stability compared to that for varus knees: In vivo kinematic study |
| title_full | Medial pivot total knee arthroplasty for valgus knees provides equivalent medial stability compared to that for varus knees: In vivo kinematic study |
| title_fullStr | Medial pivot total knee arthroplasty for valgus knees provides equivalent medial stability compared to that for varus knees: In vivo kinematic study |
| title_full_unstemmed | Medial pivot total knee arthroplasty for valgus knees provides equivalent medial stability compared to that for varus knees: In vivo kinematic study |
| title_short | Medial pivot total knee arthroplasty for valgus knees provides equivalent medial stability compared to that for varus knees: In vivo kinematic study |
| title_sort | medial pivot total knee arthroplasty for valgus knees provides equivalent medial stability compared to that for varus knees in vivo kinematic study |
| topic | in vivo kinematics medial pivot total knee arthroplasty valgus knees varus knees |
| url | https://doi.org/10.1002/jeo2.70013 |
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