Fig. 5
From: Bernese periacetabular osteotomy (PAO): from its local inception to its worldwide adoption
1984: first operated case—13-year-old female with PFFD of the left hip. a Varus proximal femur after intertrochanteric osteotomy 3 years earlier. b Periacetabular osteotomy followed by intertrochanteric revalgisation for better joint congruity. Good lateral coverage of the head. Increased retroversion of the acetabulum led to posterior subluxation 3 months after surgery, which was treated with a posterior shelf. c Progressive joint degeneration after 36 years. Plate for shelf fixation still in place. d Follow-up radiography of THR 2 years later. The patient regained a normal gait pattern