The authors describe the aetiology and different types of a serious affection of the hip joint which occurs during adolescence--juvenile proximal femoral epiphysiolysis. They describe surgical methods used in non-dislocated and dislocated conditions of this affection of the adolescent hip joint. In the course of ten years at the Orthopaedic Clinic of the Institute of Postgraduate Medical Training a total of 88 epiphysiodeses and stabilizations of the proximal femoral epiphysis were performed, 32 osteotomies at the level of the trochanter minor according to Southwick's method, two osteotomies by Imhäuser-Weber's method and in 42 patients the epiphysiolysis was treated by subcapital osteotomy by Dunn's method. The authors emphasize accurate and early diagnosis of the disease and selection of correct surgical tactics. Adjustment of the anatomical conditions in the hip joint with restoration of articular congruence creates perspectives of its optimal function.