Figure 4: Exemplar articular deviation maps, with the torner flex shoulder system reverse insert used as the reference model compared to the 36 mm diameter polyethylene inserts from the other models and manufacturers. (a) Intact tornier aequalis reversed insert geometry with the articular surface that was isolated for comparison highlighted in red, (b) Arthrex, (c) Biomet, (d) Tornier flex shoulder system reverse, (e) Zimmer anatomical shoulder inverse/reverse, (f) Zimmer trabecular metal reverse shoulder. Registrations were centered at the base of the geometry, where the glenosphere would make contact with the polyethylene insert