Articulated joint head - has offset shank with recesses at various points for locking screw to give improved positioning

摘要

The articulated joint head, especially for the humeral shank of a shoulder prosthesis, has a shank with recesses (1al) for a locking element (3) fitted through the upper end of the prosthesis (2) and into the socket (2a) which receives the shank. The recesses (1al) have truncated conical bases, tapering at an angle of 90 degrees, and are offset at different points along the shank and around its surface. In addition, the shank can be offset relative to the axis of the head. ADVANTAGE - Improved prosthesis head positioning.