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Spin out of the polyethylene
15%
378/2574
Periprosthetic fracture
1%
13/2574
Posterior knee dislocation
75%
1941/2574
Osteolysis
6%
154/2574
Patellar instability
3%
68/2574
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A posteriorly stabilized knee has a post built into the polyethylene bearing that articulates with the box of the femoral component in flexion to act as a cam mechanism. If the knee is too loose in flexion, it is possible for the femoral component to "jump the post", causing a posterior dislocation. Clarke and Scuderi review flexion instability as a mode of failure in knee replacements. They describe how this is usually due to lack of adequate balance at the time of surgery. They also report that revision surgery is usually the only way to correct symptomatic flexion instability.
4.4
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