<prompt> All of the following are true about ACL. Except-Prevents anterior motion of femur over tibiaPrevents anterior motion of tibia over femurAlso provide some secondary varus-valgus stabilityIs taught in extension of knee  <response>: ACL prevents anterior gliding of tibia over femur. It is taut during extension and also provides secondary medio- lateral valgus- Varus stability. Ref: Spos medicine 4the p.83 