An axillary view taken the the functional position of elevation in the plane of the scapula (note the spinoglenoid notch showing it was taken properly) reveals bone on bone contact, however. No CT necessary!
How can this be?
The answer is that cartilage is often lost in the central aspect of the head so that the joint space loss shows when the arm is in a functional position of elevation in the plane of the scapula, but not with the arm adducted where the remaining cartilage is interposed between the head and the glenoid. It's a bit like Friar Tuck.
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