what is a torn ac in your knee
1 Torn ACLs are a common knee injury. 2  An ACL tear or sprain occurs when a sudden change in direction or pivot occurs on a locked knee. 3  A pop, followed by pain and swelling of the knee are the most common symptoms of an ACL tear. 4  Women are more likely to tear their ACL because of differences in anatomy and muscle function. Women are more likely to tear their ACL because of differences in anatomy and muscle function. 2  Treatment goals are to return the patient to his or her preinjury level of function. 3  Arthroscopic surgery may be required to reconstruct the torn ligament.