Isometry of the anterior cruciate ligament: an intraoperative perspective.

The emphasis our society places on physical fitness has produced an ever increasing number of injuries to the anterior cruciate ligament (ACL). To successfully replace the anterior cruciate deficient knee, physicians need to determine the "ideal" location for the femoral tunnel. In the search to find this "isometric point," if there is one, we draw attention to the origin of the distal fascicles of the anterior cruciate from the lateral femoral condyle. Visualizing this surgical landmark can facilitate and expedite accurate placement of the isometric device and thus influence the results of the surgical procedure. Also, magnetic resonance imaging may help the surgeon in locating the origin of the ACL.