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[Posterior shoulder dislocation. An often overlooked injury].

G Blatter1, P Suter

  • 1Klinik für Orthopädische Chirurgie, Kantonsspital St. Gallen.

Schweizerische Medizinische Wochenschrift
|September 22, 1990
PubMed
Summary

Posterior shoulder dislocation is rare, often missed due to the arm

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Area of Science:

  • Orthopedics and Sports Medicine
  • Radiology

Background:

  • Posterior shoulder dislocation is an uncommon injury, accounting for only 2% of all shoulder dislocations.
  • These dislocations are frequently misdiagnosed initially because the affected arm is typically held in a position of adduction and internal rotation, mimicking a normal arm position.

Observation:

  • Key clinical signs include a fixed internal rotation of the arm.
  • Characteristic scapular movement during attempted upper extremity abduction is also a notable finding.

Findings:

  • Standard anteroposterior (AP) shoulder radiographs, sufficient for anterior dislocations, often fail to reveal subacromial posterior dislocations.
  • Diagnostic imaging requires specific views beyond the routine AP film.

Implications:

  • Accurate diagnosis of posterior shoulder dislocation relies on recognizing subtle clinical signs and utilizing appropriate radiographic techniques.
  • Recommended imaging includes an anteroposterior view combined with either an axillary lateral or a tangential scapula view for definitive diagnosis.

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