[Late assessment of the hip joint treated with the Freyka pillow without complications for congenital dysplasia and dislocation].

Clinical and radiological assessment of 504 hips in 389 patients of 10 to 21 years of age (13 years 10 month on average) has been carried out. The patients were treated by Freyka pillow in the childhood. Those with no reduction achieved primarily and operated on because of residual dysplasia as well as patients with severe avascular necrosis were excluded from this study. In 99% of the hips no clinical abnormality was found except for the change of rotation range--decreased external rotation. Radiographic assessment revealed 60% excellent results and 35% good ones with dominant residual feature of increased anteversion of the femoral neck. Remaining 5% were rated as fair--these were the cases that should have been operated on at a suitable time.