Figure 1 represents a cross-sectional view of the shoulder system (29) according to the present teachings. The system utilizes the glenoid coupling member or glenoid tray (20) to couple a shoulder bearing (23) to the prepared glenoid. Disposed within the glenoid tray is the shoulder bearing having a mounting interface surface (24) and concave bearing surface (25). The concave bearing surface is configured to interface with the articulating surface of a humeral prosthetic (27). The mounting interface surface can have an intermediate depending piston (26). The intermediate depending piston can be fixed to mounting interface surface or, as described below, to the glenoid tray. Operably disposed between the shoulder bearing and the glenoid tray is an annular spring member (35). The spring member functions to couple the bearing to the glenoid tray. In this regard, the spring member functions to limit or constrain movement of the shoulder bearing with respect to the glenoid tray. Additionally, the spring member functions to absorb impacts or forces applied onto the bearing surface. The annular spring member has a first end fixably coupled to an aperture (28) formed within the glenoid tray. At its second end, the spring member is fixably coupled to an aperture (30) formed on the interface side of the bearing.
