The anterior cruciate ligament (ACL)is one of the major knee joint ligaments in people, and damage to this ligament is fairly common in athletes. An ACL tear is most often a sports-related injury but can also result from accidents, falls, and work-related injuries. Most sports-related ACL tears occur when a person pivots or lands from a jump. Based on this information as well as your knowledge of ligaments, which of the following occurs in an athlete who has a torn ACL?

Question

Quizplus · Accepted Answer

A torn ACL leads to instability or weakness of the knee joint. Option A is incorrect because the ACL tear does not directly affect the ability to contract the quadriceps. Option B is incorrect because the ACL tear does not directly affect the ability to relax the quadriceps. Option D is incorrect because rapid firing of all neurons involved in the affected motor unit is not a direct consequence of an ACL tear.

The Anterior Cruciate Ligament (ACL)is One of the Major Knee