["Sound" surgical concepts and problematic indications in orthopedics]

With sound operative procedures we try to approach the operative goal as closely as possible not only technically by control of the primary operation. We have also to consider the less regulable reactions of the postoperative functional adaptation of the locomotor system when planning an operation. With this in mind we ought to reevaluate our indications and operative methods not the least from a forensic point of view. Some sound and unsound procedures are discussed with the sole intertrochanteric osteotomy for treatment of acetabular dysplasia in childhood as a negative example, because of it's-physiological-tendency towards revalgisation.