Risk Factors, Pathobiomechanics and Physical Examination of Rotator Cuff Tears

BACKGROUND It is important to appreciate the risk factors for the development of rotator cuff tears and specific physical examination maneuvers. METHODS A selective literature search was performed. RESULTS Numerous well-designed studies have demonstrated that common risk factors include age, occupation, and anatomic considerations such as the critical shoulder angle. Recently, research has also reported a genetic component as well. The rotator cuff axially compresses the humeral head in the glenohumeral joint and provides rotational motion and abduction. Forces are grouped into coronal and axial force couples. Rotator cuff tears are thought to occur when the force couples become imbalanced. CONCLUSION Physical examination is essential to determining whether a patient has an anterosuperior or posterosuperior tear. Diagnostic accuracy increases when combining a series of examination maneuvers.