How is a true lateral humerus determined to be positioned properly?
the humeral epicondylar plane is 45 degrees medially
the humeral epicondylar plane is perpendicular to the IR
the humeral epicondylar plane is parallel to the IR
the humeral epicondylar plane is rotated 45 degrees laterally
the humeral epicondylar plane is perpendicular to the IR
Rationale: For the AP nontrauma projection of the humoral, the palm is supinated and the humeral epicondylar plane is adjusted parallel to the image receptor. For the rotational lateral, the palm is internally rotated until the humeral epicondylar plane is perpendicular to the image receptor.
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