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Posterior Capsular Ligament – Role in TKR

- Discussion: (see TKR menu)
    - posterior capsular ligament has three parts; (see posterior oblique ligament)
    - one overlies each femoral condyle and a third, shorter section passes between them;
    - these three parts normally limit extension provided that the depths of the prosthetic surfaces and the cement are exactly correct;
    - stability in full extension is fundamental to the success of knee replacement;
    - if fixed flexion is present after operation, muscle effort is wasted;
    - if too much hyperextension is allowed, knee feels unstable & flexor and extensor muscles act together to maintain a normal posture;
    - uses of the posterior capsular ligaments to define exact position of femoral component ensures stability in full extension;
    - new tibial component is cemented in place & uncemented femoral trial component used to ensure that sufficient bone has been removed from the end of the femur
            to allow a few degrees of hyperextension;
            - ligaments should be taut and stable in extension;
    - removal of posterior osteophytes

Stripped knee capsule does not increase range of motion in total knee arthroplasty