Shoulder prosthesis for treating complex fractures of proximal end of humerus of patient, has small lug penetrating into recess on wall of cavity so as to block vertical displacement of pin and axial insert blocking horizontal recoil of pin

摘要

The prosthesis has an articular element in form of a prosthetic humeral head (1) equipped with a pin (3) on a lower surface. A prosthetic stem (2) is inserted in a humerus and equipped with a central cavity (6) on an upper surface. An axial insert in form of a stem is placed vertically in the cavity in contact with the pin. The pin has a small lug (4) on one of side surfaces, where the lug penetrates, by sliding motion, into a recess on one of walls of the cavity to block vertical displacement of the pin. The insert blocks horizontal recoil of the pin by vertical sliding motion.