<prompt> In Complete ACL rupture the tibia moves over the femur in which direction -ForwardBackwardlateralMedial  <response>: Ans. is a i.e., Forward ACL injuryo ACL is the most commonly injured ligament of knee.o Most common mechanism of injury is twisting medial rotation with valgus injury on semiflexed kneeo Often with this mechanism MCL and medial meniscus are also injured. This triple injury of ACL, MCL and medial meniscus is called ODonghue triado Isolated ACL can also be injured by hyperextension injuryo There is excessive anterior translation of the tibia over femur in ACL Injury.Tests for ACL injuryo Following tests are used for ACL injury:-i Lachmanstestii Anterior drawer testiii Pivot shift testiv Jerk testv Flexion-rotation drawer testvi Looses testo Lachmans test is the most sensitive test for anterior cruciate ligament tears. 