A sterile implantable device designed to provide fixation within the proximal humerus and a site of attachment for a humeral head or humeral body prosthesis as part of a shoulder joint replacement. It is made of metal [e.g., titanium (Ti), cobalt-chrome (Co-Cr), stainless steel] and has a convoluted/perforated surface intended to improve fixation and stability by promoting bone ingrowth. Fixation devices for implantation (e.g., screws) may be included and implantation is typically intended to be performed without bone cement.