Here is the anteroposterior view of the right shoulder of a former baseball pitcher in his early 30's several years after a posterior labral repair. The film shows loss of radiographic joint space and osteophytes.
His axillary "truth" view, taken with the arm in a functional position of elevation, shows the humeral head sitting in the posterior concavity of a biconcave glenoid
With a usual amount of glenoid retroversion
And substantial posterior decentering of the humeral head on the face of the glenoid
The amount of decentering can be measured in terms of the amount of posterior displacement of the center of the humeral head in reference to the perpendicular bisector of a line segment connecting the anterior and posterior edges of the glenoid.
This is all the information needed to plan his reconstructive surgery which will be a ream and run.
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