A torn (MCL), is an injury to the medial collateral ligament. This ligament extends from the upper-inside surface of the tibia to the bottom-inside surface of the femur. The ligament prevents the knee joint from medial instability, that is, instability in the inside of the joint.
Review Date: 6/13/2010 Reviewed By: Linda J. Vorvick, Medical Director, MEDEX Northwest Division of Physician Assistant Studies, University of Washington School of Medicine; and C. Benjamin Ma, MD, Assistant Professor, Chief, Sports Medicine and Shoulder Service, UCSF Department of Orthopaedic Surgery. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.