Shoulder dislocation x ray

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Shoulder Dislocation Microchapters

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-In-Chief: Jumana Nagarwala, M.D., Senior Staff Physician, Department of Emergency Medicine, Henry Ford Hospital; Cafer Zorkun, M.D., Ph.D. [2]

X Ray

  • Posterior dislocation may be missed initially on frontal radiographs in 50% of cases.
  • Signs on frontal radiographs are subtle, including the trough line sign and the loss of normal "half-moon overlap".
  • Axillary, scapular Y, or posterior oblique projections are needed for confirmation.
  • The absence of external rotation on images in a standard shoulder series is a clue to posterior dislocation.
  • Loss of half-moon overlap: On a normal true anteroposterior image, there is a half-moon overlap between the humeral head and the glenoid. In a posteriorly dislocated shoulder, there is lateral displacement of the humeral head with respect to the glenoid (losing the half-moon overlap)
  • Trough line sign: In posterior dislocation, the anterior aspect of the humeral head becomes impacted against the posterior glenoid rim. With sufficient force, this causes a compression fracture on the anterior aspect of the humeral head. This compression fracture is analogous to the Hill-Sachs compression fracture seen with anterior dislocation of the glenohumeral joint. Frontal radiographs reveal two nearly parallel lines in the superomedial aspect of the humeral head.

Shown below are the X ray findings of posterior shoulder dislocation.
Posterior-shoulder-fracture-001.jpg Posterior-shoulder-fracture-002.jpg Posterior-shoulder-fracture-003.jpg

Courtesy: RadsWiki, copyleft source.


Shown below are the X ray findings of anterior shoulder dislocation.
Anterior-shoulder-dislocation-001.jpg Anterior-shoulder-dislocation-002.jpg Anterior-shoulder-dislocation-003.jpg

Courtesy: RadsWiki, copyleft source.


Shown below are the X ray findings of anterior shoulder dislocation post reduction.
Anterior-shoulder-dislocation-004.jpg Anterior-shoulder-dislocation-005.jpg Anterior-shoulder-dislocation-006.jpg

Courtesy: RadsWiki, copyleft source.

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