Posterior Shoulder Instability in Contact Athletes: Recognition, Evaluation, and Management

Posterior shoulder instability is an important cause of shoulder pain and dysfunction in contact and collision athletes, but it is often underrecognized because many patients present with vague posterior shoulder pain and activity-related symptoms rather than a clear dislocation event. Repetitive loading in flexion, adduction, and internal rotation, common during blocking, tackling, and other push-based activities, can stress the posterior capsulolabral complex and produce a spectrum of pathology ranging from pain-predominant microinstability to recurrent symptomatic instability. Accurate diagnosis depends on careful pattern recognition through history, physical examination, and imaging interpreted in the proper clinical context. Nonoperative management with structured rehabilitation remains an appropriate initial strategy for selected athletes, although this approach may be less predictable in high-demand collision sports. Operative treatment is often considered in athletes with persistent symptoms, recurrent instability, or structural pathology that reduces the likelihood of success with rehabilitation alone. Osseous morphology, including posterior glenoid bone loss, dysplasia, and version abnormalities, may also influence treatment selection in selected cases. Return-to-play decisions should be criterion-based rather than time-based and should emphasize restoration of pain-free function, near-symmetric strength, dynamic stability, psychological readiness, and tolerance of sport-specific loading. Current evidence supports an individualized approach to management, but further athlete-specific prospective studies are needed to refine morphologic risk stratification, treatment selection, and return-to-play decision-making.