抄録
The purpose of this retrospective study was to evaluate rotational instability of the basal neck fracture of femur using Gamma nailing. Twenty-six cases (1 man, 25 women) of basal neck fracture of femur, treated by Gamma nail from 1992 to 2004, were investigated. The mean age was 81.8 years (range, 66-95 years). The mean follow up period was 23.8 months (range, 2-96 months).
Five cases had rotational instability (2 cases of “cut out”, 3 cases of rotational malunion) on radiographic images. These cases were characterized by fracture with large displacement before surgery, and with surgical failure (insufficient length of lag screw insertion, malposition of lag screw, rotational fixation).
When we treat basal neck fracture of femur with large displacement by Gamma nail, we need to keep good alignment and to insert the lag screw accurately. The surgical technique requires much skill. We do not recommend the Gamma nail for this type of fracture.
