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Review Question - QID 7039

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QID 7039 (Type "7039" in App Search)
Posterior cruciate-retaining total knee arthroplasty has been studied by numerous methods including kinematic video fluoroscopy. Which of the following is the best description of typical kinematic behavior?

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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