Anterior cruciate ligament (ACL) injuries may occur from coming to a quick stop with a directional change while running, pivoting, landing, or overextending the joint in either direction.
Review Date 4/9/2018
Updated by: C. Benjamin Ma, MD, Professor, Chief, Sports Medicine and Shoulder Service, UCSF Department of Orthopaedic Surgery, San Francisco, CA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.