The SI Projection of the Trauma Shoulder
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Introduction
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The SI/IS shoulder projection and its numerous variants often provide vital information in assessing shoulder trauma radiographically. Importantly, humeral head/neck fractures can be revealed to be fracture-dislocations after imaging the patient in the IS/SI position. It is noteworthy that an SI/IS or modified SI/IS can be performed on every shoulder trauma patient- a patient's inability to abduct his/her humerus does not preclude these projections.
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