The rotator cuff is a group of muscles and tendons that form a cuff over the shoulder. These muscles and tendons hold the arm in its "ball and socket" joint and are involved in essentially all shoulder motions.
Update Date 7/6/2011
Updated by: 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. Health Solutions, Ebix, Inc.