Posterior Shoulder Instability

Posterior shoulder instability is an uncommon result of trauma to the upper extremity. Patient risk factors and mechanisms may predispose individuals to this pathology. Initial examination of the patient, scrutiny of imaging, and clinical decision-making are perhaps the most important information presented in this chapter, as these injuries are too often missed. Indeed, efficient triage and initial management generally result in good clinical outcomes, while missing the diagnosis often ends in long-term negative consequences for the patient. Conservative, arthroscopic, and open management depends on ligamentous laxity, labral injury, bone loss, and patient demands.