Which ligament controls abduction (valgus) of the knee?

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Multiple Choice

Which ligament controls abduction (valgus) of the knee?

Explanation:
Valgus stress on the knee is resisted mainly by the medial collateral ligament. This ligament runs along the inner knee and tightens when the knee is pushed outward, preventing the tibia from abducting relative to the femur. The opposite side’s ligament (the lateral collateral ligament) protects against varus (adduction) stress, not valgus. The cruciate ligaments (ACL and PCL) control anterior-posterior translation and some rotational stability, but they are not the primary restraints to medial collapse under valgus load. So the medial collateral ligament is the key structure limiting abduction of the knee.

Valgus stress on the knee is resisted mainly by the medial collateral ligament. This ligament runs along the inner knee and tightens when the knee is pushed outward, preventing the tibia from abducting relative to the femur. The opposite side’s ligament (the lateral collateral ligament) protects against varus (adduction) stress, not valgus. The cruciate ligaments (ACL and PCL) control anterior-posterior translation and some rotational stability, but they are not the primary restraints to medial collapse under valgus load. So the medial collateral ligament is the key structure limiting abduction of the knee.

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