While some surgeons try to use a guide wire in an attempt to 'correct' glenoid retroversion (as shown in the upper figure copyrighted by Steve Lippitt ) we use a nubbed reamer that allows us to adjust the angle of the reamer to minimize the bone removal in conservatively reaming the glenoid to a single concavity (lower figure).
Below is an example of a two year followup of a ream and run procedure in which the glenoid was reamed conservatively without specific attempt to change version.
An anteriorly eccentric humeral head was used to achieve centering in the reamed glenoid as shown below.
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