“…2,6,15,18,29 Therefore, deriving relevant geometric parameters such as humeral head retrotorsion, inclination, humeral length, and humeral head size can facilitate preoperative planning and accurate reconstruction during shoulder replacement surgery. 2,6,20,38 If 3D planning and computer-assisted surgery in total shoulder arthroplasty are desired, 8,10,17,21,28,33 methods for reproducible 3D quantification of the humeral anatomy are essential. We therefore developed computer algorithms for performing 3D measurements of the humeral anatomy and investigated bilateral differences of relevant geometric parameters, which can then play a role in inferring anatomic information for the pathologic side from the healthy side.…”