as shown to the right below.
The original thought with these eccentric heads was to use them to achieve coverage of the humeral neck and, thereby help restore the preoperative anatomy.
We have discovered, however, that creative use of the eccentric humeral heads can enable us to stabilize the humeral head on the glenoid in the face of severe glenoid deformity: the bad arthritic triad (BAT) as shown in the ream and run case below. Note in the preoperative axillary view the severe B2 glenoid with posterior humeral head subluxation.
To see how this shoulder is functioning two years after surgery, open the youtube on this post.
The eccentric humeral head can also be used in excessively anteverted glenoids. In this total shoulder case we resolved a tendency for anterior instability by using a posteriorly eccentric humeral head.
Note also that CT scans are not necessary for identifying and managing the glenohumeral pathoanatomy. See also here.
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