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- Title
No difference in patellar tracking between symmetrical and asymmetrical femoral component designs in TKA.
- Authors
Stoddard, J.; Deehan, D.; Bull, A.; McCaskie, A.; Amis, A.
- Abstract
Purpose: Poor knee extension function after total knee arthroplasty (TKA) is associated with factors including articular geometry and alignment. Femoral trochlear geometry has evolved from symmetrical to become more prominent proximal-laterally, with the groove aligned proximal-lateral to distal-medial. This study in vitro tested the hypothesis that a modern asymmetrical prosthesis would restore patellar tracking and stability to more natural behaviour than an older symmetrical prosthesis. Methods: Six knees had their patellar tracking measured optically during active knee extension. Medial-lateral force versus displacement stability was measured at fixed angles of knee flexion. The measurements were repeated after inserting each of the symmetrical and asymmetrical TKAs. Results: Significant differences of patellar lateral displacement stability, compared to normal, were not found at any angle of knee flexion. The patella tracked medial-laterally within 2.5 mm of the natural path with both TKAs. However, for both TKAs near knee extension, the patella was tilted laterally by approximately 6° and was also flexed approximately 8° more than in the natural knee. Conclusion: The hypothesis was not supported: The more anatomical component design did not provide more anatomical patellar kinematics and stability.
- Subjects
TOTAL knee replacement; RANGE of motion of joints; HEALTH of patients; PATELLOFEMORAL joint; KNEE abnormalities; ANATOMY
- Publication
Knee Surgery, Sports Traumatology, Arthroscopy, 2014, Vol 22, Issue 3, p534
- ISSN
0942-2056
- Publication type
Article
- DOI
10.1007/s00167-013-2534-8