Total hip arthroplasty in high dislocation development dysplasia is a surgical challenge. The lowering of the center of rotation requires extensive soft tissue release and sometimes shortening of the femoral diaphysis. At the level of the acetabulum, the use of small hemispheric cups and use of reconstruction techniques of acetabular coverage is necessary. At the level of the femur, shortening osteotomy is often recommended. Deformities of the femur such as excessive anteversion and the narrowed femoral canal advise the use of diaphyseal anchoring stems. Conical Stems provided a secure diaphyseal fit, due to its taper design, and torsional resistant, due to its longitudinal ribs. For this reason, Conical Stems provided, at the same time, an
