The World Health Organization defines subluxation as “an incomplete or partial dislocation”.
In the below axillary picture, the posterior subluxation is seen in the glenoid of the humeral. The arm was in a functionally elevated position. This “truth view” may be more effective at detecting posterior decentering compared to a CT done with the arm on the side. See Answering the crucial question: To what degree is humeral function centered on glenoid? Six easy steps.
See The glenoid may loosen after a total shoulder replacement if the humeral humeral head is not centered properly. (We found that 25% of patients displayed a posterior malcentering fixed in a relaxed position, but 85% demonstrated a de-centering functional during elevation of an arm.
The subject of aThe increasing number of articles on rthritic shoulders subluxation shows that it is of interest.
The amount of posterior subluxation of the humeral head on the glenoid can be determined on an axillary projection as described by Walch et al in Primary glenohumeral osteoarthritis:…