Medial stability of the knee is a complex issue, and involves ligaments that behave differently in flexion and extension. The contracture and stretching that occur due to deformity and osteophytes affect these ligament structures unequally, and often cause different degrees of tightness or laxity in flexion and extension after the bone surfaces are resected correctly for varus-valgus alignment. The distortion of the joint surface also can cause varus-valgus alignment to differ in the flexed and extended positions, and the knee thus may require adjustment of portions of the medial stabilizing complex that affect stability either in flexion or extension.
KeywordsTotal Knee Arthroplasty Posterior Cruciate Ligament Medial Collateral Ligament Lateral Collateral Ligament Posterior Capsule
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