A shoulder arthroplasty apparatus includes a stemless humeral head for coupling to a previously cut humeral surface. The base of the humeral head has a stabilizing base extension that is impacted into a cancellous region of the cut humeral surface. A preferred base extension has a cruciform shape including...http://www.google.com.au/patents/US20010047210?utm_source=gb-gplus-sharePatent US20010047210 - Facile total shoulder arthroplasty apparatus and method
