Through-hole prosthesis for the upper humerus

摘要

A humeral prosthesis consists of a shank (10) which fits in the humeral canal, a metaphysis section (11) which extends upwards and inwards from the shank and connects with a collar (15), and a hemispherical dome (2) which is supported by the collar and engages with the shoulder socket. The median axis (D) of the collar lies along a diametrical line in the same plane as the axis (A) of the shank. The connection between the shank and collar covers only a part of the joint zone, leaving a free space (V) to provide for the meeting and fusion of bone fragments of the humeral metaphysis. In a variant of the design the connection between the shank and collar can have a single curved branch, leaving a space around it for the fusion of the bone fragments.