Intermediate fastening for femoral head of hip joint prosthesis - comprises hollow pin with tapered external configuration and longitudinal dimensions calculated in relation to sizes of shaft and head.

摘要

The length of the pin (10) is determined as a function of the distance (P) between the head (20) and the shaft (2) of the prosthesis. The external diameter of the end surface (EP) of the pin is very slightly larger than the internal diameter of the inner end of a conical hole in the head, into which the pin is inserted. The internal diameter of a hollow portion of the base (EB) of the pin is very slightly less than the external diameter of the base of a tenon of the prosthesis shaft, which fits into the hollow portion. The external surface (12) of the pin is ribbed, and the pin is formed of metal or plastics material. ADVANTAGE - Allows adjustment of dimensions of pin to suit different applications.