The present invention is directed to a modular shoulder prosthesis having an adjustable radial offset andor angular inclination provided by relative rotation of an adapter interdisposed between the stem and the head. In one embodiment, an apparatus includes a plate having a camera, transmitter and battery coupled thereto. Accordingly, control channel traffic can be prevented from concentrating on a particular carrier, and a diversity gain can be achieved. The bottom plate of the adapter also includes positive and negative contact leads which communicate with the contact openings and the module so that the latter receives power from the battery.