USE OF A CT-BASED NAVIGATION SYSTEM TO INSERT CUSTOM-MADE STEMS INTO DYSPLASTIC HIPS AFTER INTERTROCHANTERIC OSTEOTOMY IN JAPANESE PATIENTS

IntroductionDeformity after femoral osteotomy varies between patients. Some researchers reported good results when using cemented stems for the hips after femoral osteotomy, but there are many disadvantages that obstruct ideal fixation using cemented stems. Therefore, we developed cementless custom-made stems and inserted those using a computed tomography (CT) –based navigation systemMethodsEighteen dysplastic hips of 15 patients after intertrochanteric osteotomy were investigated in the present study. Individual computed tomography data were used to manufacture cementless custom-made femoral stems out of Ti-6Al-4V. The proximal 1/3 of each stem was coated using porous coating covered with hydroxyapatite coating. The stems were inserted using a CT-based fluoro navigation system for accuracy of insertion. The average patient age at time of surgery was 66 years, and the average follow-up period was 3.5 years.ResultsNo fracture was observed during any surgery or follow-up period. The average preoperative Har...