Abstract: An implant assembly for re-establishing a glenohumeral joint between a scapular and humerus. A ball is adapted to being mounted to a reconditioned glenoid cavity defined in the scapula along with a receiver mounted to a reconditioned humeral head associated with the humerus. A substantially spherical shaped element is interposed between the ball and receiver and establishes first and second articulating surfaces. A concave recess is defined in an exposed face of the ball for seating in articulating fashion a portion of the spherical element. A concave recess is defined in the spherical shaped element for seating in articulating fashion an exposed portion of the scapula mounted ball. Each of the ball, spherical element and receiver is constructed of an alternating material including at least one of a polymer, polymer composite, metal, metal composite or polymer/metal admixture.