[Corrective osteotomy of the coxal end of the femur].

Malpositionings at the coxal end of the femur are mostly congenital or are produced post-traumatically by unsatisfactory osteosyntheses or secondary varus deformity if load was applied too early. Such malpositionings can occur after fracture of the neck of the femur or also after pertrochanteral fractures. Frequently, they present technical difficulties, since the anatomy of the coxal end of the femur is changed due to trauma and operation, and also because there is often a clearly noticeable inactivity atrophy as a result of prolonged duration of the disease. The bony substance into which the adjustment plate is anchored in the neck of the femur, may also have been weakened by defects from other implants. Although operation and after treatment are frequently rendered difficult under these circumstances, restoration of a hip joint capable of sustaining load is usually achieved. Restoration can be limited if infections or irreparable necroses of the head of the femur have occurred.