<prompt> Not true about anterior cruciate ligament -It begins just behind the anterior horn of lateral meniscus on tibiaIt is taut in extensionIt provides proprioceptive inputs to kneeIt is extrasynovial  <response>: Ans. is a i.e., It begins just behind the anterior horn of lateral meniscus on tibia Anterior cruciate ligament ACL ACL is one of the most important ligament of the knee joint. ACL begins from anterior part of intercondylar area of tibia just behind the anterior horn of medial meniscus and runs upwards, backwards laterally to attach the posterior part of medial surface of lateral condyle of femur. Both Cruciate Ligaments are Intra articular, intra capsular and extrasynovial. ACL provides antero-posterior stability and prevents anterior gliding of tibia on femur and prevents hyperextension. ACL also provides proprioceptive function of knee joint. ACL is taut during extension. 