In this simulation study, the effect of different glenosphere positions on the the motion of the reverse total shoulder before unwanted scapulo-humeral contact occurred. The authors found that lateralization (10 mm), and inferior tilt (30°) allowed impingement-free motion in internal and external rotation.
Unwanted scapulo-humeral contact not only restricts motion and may give rise to scapular notching, but it also may predispose to instability when the contact levers the joint surfaces apart. As shown in a comparison study....some designs retain the original Grammont concept of medialization others relatively lateralize the center of rotation. So it is important to know the reverse system you are using.
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