"Posterior dislocations can be difficult to identify on an AP view only (as may be obtained in the setting of a secondary survey of a trauma), as the humeral head moves directly posteriorly and congruency may appear to be maintained (at least at first glance)."
"Hill-Sachs defect"
Expected headings
"Relevant anatomy"
"Type of dislocation"
"Report checklist"
"It is useful to determine whether the dislocation is acute, chronic or recurrent."
"The glenoid is a saucer-shaped extension of the scapula. Its shape means that it offers limited bony support to the joint. The glenoid is augmented by the cartilaginous labrum with additional support from the joint capsule, surrounding ligaments and the muscles of the rotator cuff. The labrum, capsule and ligaments tend to be stronger in younger patients."
"The shoulder is exceptionally maneuverable and sacrifices stability to enable an increase in function. Its shallow glenoid fossa, relatively weak glenohumeral ligaments, and redundant capsule render it particularly susceptible to dislocation. It is the most commonly dislocated large joint; indeed, the most commonly dislocated joint in the body 5. Approximately half of the major joint dislocations seen in emergency departments are of the shoulder 1."
"Anterior dislocation will result in the humeral head being displaced deep into the far field (away from one's probe), whereas posterior dislocations will result in the humeral head being located in the near field (presuming the usual posterior position of one's transducer). Care should be taken to differentiate glenohumeral dislocation from subluxation; the latter will appear to transiently "dislocate" with an active range of motion (internal/external rotation)."