Abstract
Posterior shoulder dislocation is a unique finding in the orthopedics field. Although it is rarely found, this condition is one that must be considered in the presence of acute shoulder pain. Most clinicians often miss this diagnosis on initial examination; therefore, imaging radiographs are often needed to confirm the diagnosis. Unfortunately, insufficient radiographic assessment can be the greatest pitfall in establishing an accurate diagnosis. Multiple radiographic projections, including anteroposterior view, scapular Y view, and the axillary view, are important to achieve an accurate diagnosis. In this study, we present a middle-aged patient with a pain and trauma history on the shoulder. Anteroposterior radiographic examination revealed an atypical finding. Fortunately, additional radiographic projections were successful in establishing the proper diagnosis of posterior shoulder dislocation. This study also presents a comprehensive review of the keys in the recognition and treatment of the injury.
Highlights
A posterior shoulder dislocation (PSD) is a rare form of orthopedic injury, with an estimated incidence of less than 4% of all shoulder dislocations in the emergency department
Posterior shoulder dislocation is classified into the simple type and complex type
The study recommends performing the axillary view projection because a single AP view alone may lead to a misdiagnosis of the injury [6]
Summary
A posterior shoulder dislocation (PSD) is a rare form of orthopedic injury, with an estimated incidence of less than 4% of all shoulder dislocations in the emergency department. The high incidence of complications from this injury makes early detection important in preventing long-term comorbidities [2]. Posterior shoulder dislocation is classified into the simple type and complex type. A simple dislocation occurs in the presence of a humeral head impression fracture or different degrees of reverse Hill-Sachs lesions. Rouleau et al reported that diagnosis PSD requires a high level of suspicion and appropriate imaging. We present a middleaged patient with a clinical case of PSD and the relevant literature review regarding diagnosis making and management of this rare entity
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