An implantable device designed to augment the implantation of a shoulder prosthesis base plate (glenoid base plate) by serving as a space-filler within the prosthesis, typically to replace lost bone and increase bone contact area and aid stability. It is typically made of metal [e.g., cobalt-chrome (Co-Cr), cobalt-chrome-molybdenum (Co-Cr-Mo) or titanium (Ti)].