A self-locking stemmed component (1) for a joint endoprosthesis consists of two lobes (4,5) of which one (4) is designed for transfer of compression loads and the other (5) for transfer of tension loads. Both lobes (4,5) are interconnected by a number of connecting structures (6), preferably in the form of struts, which are responsive to a bending moment to produce an increase of the stem thickness upon loading of the stemmed component (1), thereby pressing the lobes (4,5) against the inner cortex of the medullary canal (23) of a tubular bone (10).

The invention relates to an artificial hip endo-limb comprising a spherical joint supported by a shaft. A porous shell of metal, synthetic material, ceramics and the like is provided on the circumference of the shaft. The porous shell is transversely divided and separated by spacing elements and may be longitudinally divided, and the surface can be provided with grooves.

An endoprosthesis insertable in a bone cavity comprises an anchoring shaft having circular steps at least in supporting regions (X,Y) of the anchoring shaft in which a support of said anchoring shaft in the bone takes place. The shaft has at a free end remote from a mouth of the bone opening a straight portion. The steps are formed in at least the straight portion one after another without undercuts. The shaft conically widens from said end towards an end opposite to said free end. The steps have contours which are at least in the region in which the steps are supported in the bone, individually adjusted to respective cross-sections of the bone hollow, which cross-sections exist at the positions of the individual steps when the endoprosthesis is inserted into the bone.

An improved femoral hip joint replacement and method are disclosed, as well as a drilling fixture to assist with carrying out the method. The method involves the provision of an elongated excavation or aperture by drilling of overlapping boreholes in the top of the femoral head, and then securing therein a similarly-contoured femoral insert adapted to be located within the femoral shaft and within the boreholes in the remaining upstanding portions of the remodeled femoral head. A metal cap, of approximately the normal femoral head size, or an arcuate portion thereof, is secured to or integral with the insert and projects in usual manner from the superior portion of the remodeled femoral head and is adapted to fit into an acetabulum of the hipbone. According to the method of the invention and with the employment of the femoral hip joint replacement provided thereby, there is substantially no chance of axial or rotational movement of the femoral hip joint replacement or any portion thereof within the femoral shaft or with respect to the remoldeled femoral head, and the remodeled femoral head produced according to the invention and employing the femoral hip joint prosthesis of the invention is accordingly characterized by superior load-bearing characteristics and stability in operation.

The stem of the femoral prosthesis is provided with a slot in the medial narrow side which communicates with a through-bore within the stem adjacent to the collar. In addition, an elastomeric filling is disposed within the through-bore and cooperates with an arch which connects the proximal end of the stem to the collar or neck in order to adapt the resilience of the stem in the proximal zone to the resilience of the cortical bone. The filling may be made of polyurethane or silicone material.