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Slight external rotation of the tibial component
77%
690/893
Slight internal rotation of the femoral component
11%
100/893
Slight anterior translation of the tibial component
2%
21/893
Use of a fixed-bearing knee as opposed to a mobile-bearing knee
3%
29/893
Use of a thicker patellar component
5%
45/893
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Slight external rotation of the tibial component will cause a net medialization of the tibial tubercle when the knee is articulated. This will help centralize the extensor mechanism over the trochlear groove and minimize the tendency for lateral subluxation. Internal rotation of the femoral component increases the risk of patellar instability. Anterior translation of the tibial component moves the patellar tendon insertion posteriorly, and may increase force on the patella but should not substantially alter patellar tracking. Clinical studies have shown no patellofemoral benefits to the use of fixed- or mobile-bearing designs. Thicker patellar components will not improve tracking, and may compound the problem.
4.0
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