Osteosynthesis device for fixing large trochanter on femoral piece of hip prothesis comprises clip, variable length socket and screw

摘要

The device is composed of three pieces (A,B) the first two being used to fix the large trochanter after installing a hip prothesis. The first piece (A) is a clip with 3 or 4 branches with a variable length socket (3) implanted in the center of its lower face. The piece (B) is a screw whose end (5) has a thread screwed into the housing (6) located at the back of the femoral piece tail near the base of the neck. The other end of the screw is a head (4) which is wider than the socket channel (2). By screwing the screw into the socket clamping of the large trochanter is caused without causing extraction of the femoral piece because of an adequate length of the socket whose lower end is in contact with the back of the femoral piece. The third piece has a threaded end for screwing into the prothesis housing and has a point at its other end. This piece positions the large trochanter by lowering the point and guides the clip for its installation and allows an exact measurement of the length of the screw.