For this inaugural Clinical Faceoff, I have invited two internationally known experts on anterior cruciate ligament (ACL) reconstruction to discuss two approa- ches: single- and double-bundle reconstruction. Russell Warren, MD, is the Surgeon-in-Chief Emeritus at Hospital for Special Surgery and a past president of the American Orthopaedic Society for Sports Medicine (AOSSM) and American Shoulder and Elbow Surgeons. Joining Dr. Warren and me is Freddie Fu, MD, the David Silver Professor and Chairman of the Department of Orthopaedic Surgery at University of Pittsburgh and past president of AOSSM and the Interna- tional Society of Arthroscopy, Knee Surgery and Orthopaedic Sports Med- icine. There is great controversy in this area, and the discussion between these two experts addresses the key issues.