Non cemented intramedullary prosthesis for a hip joint.

摘要

1. An unsealed intramedullary prothesis for articulation of the hip, of the type comprising two units suitable to be fitted to one another, namely a femoral unit (2) essentially composed of a threaded stem intended to be engaged into the medullary channel of the femur in question, and a cephalic unit (3) supporting a sphere (9), capable of being fitted to the end of the femoral portion (2) that is not engaged into the femur (4), this sphere (9) being intended to be engaged into and to rest against the cotyloid cavity of the corresponding hip, characterized in that on one hand the screw thread (5) on the stem of the femoral unit (2) is conical and, on the other hand the means of assembly of the two femoral (2) and cephalic (3) units comprise, in the femoral unit (2) a conically reamed hole of small taper, coaxial with the stem and opening at the end of the latter that is not fitted into the medullary channel of the femur (4), and in the cephalic unit (3) a conical stem (14) of profile complementary to that of the conically reamed hole (7) of the femoral unit (2), projecting from the surface (12) of the cephalic unit (3) that fits against the above-mentioned free end of the femoral unit (2) and enabling the two units to be solidly held together by a simple mutual wedging action resulting from the small taper of the cones ; in that the end of the femoral unit (2) that is not engaged into the medullary channel of the femur (4) carries a small collar (6) coaxial with the stem, the lower face of which collar is intended to bear against the resected end of the femur (4) and the upper face of which collar is intended to act as support face for the cephalic unit (3) and is provided with means for it to be rotated as it is screwed up ; and in that at least one peg (16) is provided, carried on the contact face (12) of the cephalic unit (3), and a series of holes (15) of corresponding profile is provided on the upper face of the small collar (6) of the femoral unit (2) concentric with its conically reamed hole (7), into a selected hole of which series the series the peg (16) may be inserted before the conical stem of the cephalic unit (3) is wedget into the conically reamed hole (7) of the femoral unit (2).