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Unpredictable anterior femoral condylar translation from full extension to 90 degrees of flexion
11%
23/208
Predictable femoral rollback from full extension to 90 degrees of flexion
41%
85/208
Medial femoral condyle pivot with minimal medial femoral condyle translation and lateral femoral condyle posterior translation in flexion
37%
76/208
Lateral femoral condyle pivot with minimal medial femoral condyle translation
7%
14/208
Anterior tibial contact of both the medial and lateral femoral condyles in full extension
3%
6/208
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In vivo fluoroscopic studies have enlightened orthopaedic surgeons as to the actual kinematic performance of the total knee implants. Importantly, many technical factors combine to result in abnormal kinematics after total knee arthroplasty. The typical kinematics of the normal knee are negated by osteoarthritis and the various changes created by the surgeon's technique. Dennis and associates observed that anterior femoral condylar translation during deep knee flexion was most commonly observed in posterior cruciate-retaining knees.
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