[Radiological assessment before femoral and tibial osteotomies]

After recalling the good results of femoral and tibial osteotomies for lateral osteoarthritis of the knee before the age of 70 years, the author describes the usual techniques and defines the indications. He then defines the preoperative x-rays essential for such procedures: AP and lateral films of the knee in 15 degrees of flexion, AP in forced varus and valgus with 15 degrees of flexion, femoropatellar view with 30 degrees of flexion with particular attention to "stepping" gonometry, which appears to be the most physiological approach.