Предоперационное Планирование И Хирургическая Коррекция При Избыточной Антеверсии Проксимального Отдела Бедренной Кости У Детей С Дисплазией Тазобедренных Суставов

32 patients underwent 64 surgical interventions in Orthopedic Department of Research Centre of Children’s Health between 2009 and 2012. For patients of group 1 (n=21, 4 boys and 17 girls aged 4-10 yr) surgery was planned based on the results of X-ray examination. In group 2 (n=11, 1 boy and 10 girls aged 4-8 yr) surgery was planned by the newly proposed method using CT. Diagnosis was based on the analysis of patients ’ complaints, examination, X-ray study with the measurement of hip angular parameters in the direct projection and in the position of hip abduction with maximum internal rotation, CT down to femoral condyles for determining true parameters of the cervical-diaphyseal angle, femoral anteversion. CT yielded data for the level of femoral osteotomy between greater and lesser trochanters, mean diameter of the circumference (arithmetic mean between maximum and minimum diameters). The necessary derotation length was calculated by the formula L = d × pi × c/360 degrees, where L the necessary rotation length in mm, d mean circumference diameter in mm, c derotation angle calculated as the difference between observed proximal femur anteversion and its age norm. The latter were determined as described in [13]. The outcome of surgery was assessed by the following criteria: the degree of conformity to age-specific anteversion of proximal femur in the postoperative period, symmetry of results after bilateral femoral derotation osteotomy.