What is an ACL?

The anterior cruciate ligament (ACL) is one of the four main ligaments that connect the upper and lower leg bones.

What causes an ACL injury?

The ACL may tear from too much stress and strain. This may occur after the ACL has weakened over a number of years, or it may be caused by an especially jarring move, often in sports.

What are the symptoms of an ACL injury?

An ACL injury usually causes pain and swelling of the knee. The knee will also feel unstable, and it may become painful or difficult to walk.

What are the treatment options for an ACL injury?

Physical therapy may be all that is needed if the ACL is partially torn, or even with a complete tear, depending on what activities the patient wants to continue. ACL surgery usually involves “reconstruction,” in which a tendon is grafted to replace the ACL.