Fig. 2

(A) Prior to testing, the superoinferior (red) and anteroposterior (blue) dimension of the native humeral head is carefully digitized in 0.5 mm intervals by using the 3-dimensional digitizer. (B) Following completion of translational testing, each specimen is disarticulated, and all remaining soft tissue is resected. The matched-fit elliptical is placed on the trunnion and then digitized as previously described. The data is implemented in a 3D computer graphics software and the radius of curvature of the superoinferior and anteroposterior dimensions are calculated