Standardized plain radiographs can help diagnose early glenohumeral arthritis. We have found the series shown in this link to be straightforward, reproducible, and cost effective
As an example, here are the images of a young patient who had shoulder pain and stiffness that persisted after a biceps tenodesis performed elsewhere.
While subtle narrowing of the superior joint space is noted on the anteroposterior view in the plane of the scapula
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Here are some videos that are of shoulder interest