The approach of the hip joint by an anterior hemimyotomy (AHM) of the gluteus medius was developed by J.M. Thomine and has been used since 1983 on 10,000 patients. This approach is based on the section of the anterior part of this muscle along the anterior edge of the greater trochanter. The potential inconvenience of this section is to weaken the muscular abductor system. Some experimental studies were led in order to evaluate the functional consequences of this muscular section. The abductor strength was measured with a dynamometer on 37 patients operated on a single hip. No significant difference existed after two years, between the operated hip and the normal hip. Out of 30 patients operated upon, on one side only, a post-operative study was performed relating to walking with the movement analysis device VICON. It showed a Trendelenburg sign, which was underlined with an average of 6° in the third month, but no significant difference was found between the two sides after a whole year. This transgluteal method also constitutes a risk for postoperative ossifications. We have studied this risk on a total of 65 patients operated on over two years ago for a total hip arthroplasty (THA) following primitive osteoarthritis articular destruction; 37% had no ossification, 43% had Brooker 1, and 20% had Brooker 2. No worse ossifications were detected and their functional implications were not significant using the Merle d’Aubigné evaluation (the average score being 17.85, 17.76 and 17.58). The implant position together with the good feedback from the preoperative plans, demonstrated that this approach authorised a sufficient exposure and low bleeding (on average 400 g) for primary arthroplasty. Finally, an on-going prospective study of 212 prosthetic hips showed that the dislocation rate was inferior to 0.5% in the two postoperative years.