Abstract: A stem of an artificial hip joint is capable of removing a gap that may be formed between a proximal portion of a femur and a backside of the stem. The stem has an upper end portion to face a proximal side and a backside to face a greater trochanter and is adapted for insertion into, and fixation to, a medullary space of a femur. The stem has a through bore opened both to the upper end portion and the vicinity of proximal end of the backside.

Abstract: A stem of an artificial hip joint is capable of removing a gap that may be formed between a proximal portion of a femur and a backside of the stem. The stem has an upper end portion 11 to face a proximal side and a backside 15 to face a greater trochanter 33 and is adapted for insertion into, and fixation to, a medullary space of a femur, and the stem has a through bore 17 opened both to said upper end portion and the vicinity of proximal end of said backside.

Abstract: The invention solves a problem associated with a conventional medical substituting element for hard tissues that loosening is likely to occur after the substituting element is mounted on hard tissues, by providing the medical substituting element for hard tissues with: one or a plurality of through hole units into which fixation screws are inserted; a screw stopper for stopping the fixation screw inserted into the through hole unit at the position where the head of the fixation screw becomes lower than the upper end of the through hole unit; and a slip-off prevention member engaging unit formed in the inner wall of the through hole unit at the position higher than the screw stopper, wherein after the fixation screw inserted into the through hole unit is threaded into the hard tissues, a slip-off prevention member engages with the slip-prevention member engaging unit to ensure a slip-off prevention of the fixation screw.

Abstract: The invention solves a problem associated with a conventional medical substituting element for hard tissues that loosening is likely to occur after the substituting element is mounted on hard tissues, by providing the medical substituting element for hard tissues with: one or a plurality of through hole units into which fixation screws are inserted; a screw stopper for stopping the fixation screw inserted into the through hole unit at the position where the head of the fixation screw becomes lower than the upper end of the through hole unit; and a slip-off prevention member engaging unit formed in the inner wall of the through hole unit at the position higher than the screw stopper, wherein after the fixation screw inserted into the through hole unit is threaded into the hard tissues, a slip-off prevention member engages with the slip-prevention member engaging unit to ensure a slip-off prevention of the fixation screw.

Abstract: A wedge-shaped spacer usable for varus, valgus, flexion, extension and derotation osteotomies such as corrective osteotomy for femoral shaft deformity, supracondylar osteotomy of the femur, intraarticular osteotomy of the femur, intraarticular osteotomy of the tibia, high tibial osteotomy and subtuberosity osteotomy of the tibia, supramalleolar osteotomy of the tibia and, corrective osteotomy of the calcaneus, is made of a sintered hydroxyapatite provided with a plurality of pores having a pore size of 50 to 250 .mu.m and connected with each other and with the outside through a plurality of capillaries having a thickness of 0.5 to 5 .mu.m, and having a compression strength of 300 kg/cm.sup.

Abstract: In a tibial component for use with a femoral component for an artificial knee joint, a plate section has, at its upper face, a pair of bearing surface parts which are in sliding contact with the femoral component. A stem extends downwardly from a lower face of the plate section. A pair of blade-like plicae extend obliquely posteriorly from the stem and extend from the lower face of the plate section downwardly.