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



Original Text by Clifford R. Wheeless, III, MD.

Last updated by Data Trace Staff on Thursday, May 10, 2012 11:08 am