<prompt> Which among the following is not a feature of Unhappy triad of 0 Donoghue?ACL injuryMedial meniscus injuryMedial collateral ligament injuryFibular collateral ligament injury  <response>: Ans. is d i.e., Fibular collateral ligament injury The most common mechanism of ligament disruption of knee is adduction valgus, flexion and internal rotation offemur on tibia which usually occur in spos in which the foot is planted solidly on the ground and leg is twisted by rotating body i.e., foot ball, soccer, basket ball, skiing. The medial structures medial tibial collateral ligament MCL and medial capsular ligament are first to fail, followed by ACL tears, if the force is of sufficient magnitude. The medial meniscus may be trapped between condyles and have a peripheral tear, thus producing unhappy triad of 0 Donoghue. 