A prosthesis includes a trunnion having a first end defining a uniform cross-section and a second end adapted to be fixed to a prosthesis stem. A ceramic head has a first bearing surface on which a second prosthesis fixed to a second bone can articulate. The ceramic head defines a recess. The first end...http://www.google.ca/patents/US7914584?utm_source=gb-gplus-sharePatent US7914584 - Prosthesis system with trunnion and removably coupled head
