Patent ID: 8241366

Claim:
A reverse shoulder assembly comprising: a glenoid component comprising a glenosphere and a glenoid attachment means; and a humeral component comprising a humeral liner and a humeral attachment means, wherein the glenosphere comprises an articulating surface having a convex geometry, wherein the articulating surface of the glenosphere comprises a motion inducing element in the shape of a cam, wherein the humeral liner comprises an articulating surface having a concave geometry, the articulating surface of the glenosphere adapted to articulate with the articulating surface of the humeral liner, wherein the articulating surface of the humeral liner comprises a motion inducing humeral liner surface, wherein the motion inducing element and the motion inducing humeral liner surface are sufficiently designed so that, when the glenoid component is implanted in a glenoid, and when the humeral component is implanted in a humerus, an interaction between the motion inducing element and the motion inducing humeral liner surface alters the abduction motion of the humerus relative to a scapula into a forward flexion motion of the humerus relative to the scapula, wherein the motion inducing element is sufficiently sized and positioned on the articulating surface of the gleno sphere to alter the direction of the induced motion at varying humeral positions, and wherein between about 30 degrees and about 90 degrees abduction motion of the humerus relative to the scapula, the motion inducing element initially engages the motion inducing humeral liner surface.