Endoprosthetic femoral head

Abstract

An endoprosthetic femoral head device comprising a ball-shaped head connected, by way of a necked portion, to the wider end of a tapered intramedullary stem is modified to facilitate implantation involving detachment and re-attachment of the greater trochanter. The modification comprises the provision of a slot which extends longitudinally along the wider end of the stem, is open at one end, and has an interior width greater than that of its longitudinal mouth. A bolt-like member is adjustably located by its head in this slot with its shaft projecting from the device for passage through a bore formed in the detached trochanter. The trochanter is thus relocated and is secured by a fastener on the shaft free end. Preferably a spider-form washer with spring legs is located between the trochanter and fastener, and a screw-in plug is applied to the slot to positively locate the bolt head.

Dependencies are inferred from the claim text.