<prompt> Torsion of knee results in injury most commonly toAnterior cruciate ligamentMedial meniscusFibular collateral ligamentTibial collateral ligament  <response>: Most of the guides have given tibial collateral ligament as the answer, which is wrong.ACL is the most commonly injured ligament of knee and the usual mechanism of injury is twisting torsion with valgus injury on the semiflexed knee.The ACL is the most commonly damaged knee ligament, accounting for up to 50 of all documented ligamentous knee injuries. The typical mechanism of injury is a sudden twisting injury with valgus force in a flexed knee. -- Sports injury.MCL is injured by valgus force, and if injury involves a twist in addition to valgus force, the ACL may also be damaged . - Apleys 