Humeral shank for shoulder prosthesis - has reinsertion fin connected to body of shank by grooved and cut=away surfaces

摘要

The humeral shank for a shoulder prosthesis has a reinsertion finn (1a) on the outside of its proximal end, connected to the head by lengthwise and transverse sections which ensure the partial integration of the fin into the general volume defined by the body of the shank (1). The lengthwise connecting section is formed by grooves (1c) on either side of the fin, linking progressively with the body of the shank, while the transverse section is formed by cut-away surfaces designed to reduce the cross-section of the body at the level of the fin. The proximal end of the shank is also equipped with a thrust collar (1g) which is oval in shape, and has a hole (1f) pierced through it. ADVANTAGE - More reliable retention of bone fragments from fractured shoulder.