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[The prognostic significance of clinical and radiological parameters for the revalgisation of the femoral neck following intertrochanteric derotation varization osteotomy].

This study investigates retrospectively the preoperative findings and postoperative courses of 580 children with altogether 1001 intertrochanteric osteotomies. The evaluation of on average 5 postoperative years determines criteria assisting the revalgisation of the femoral neck. Of main importance is the age at the date of operation; the younger the child is the higher is the degree of revalgisation. An also important factor is the preoperative CCD-angle, high values correlate with a high revalgisation rate. Exceptional features and alterations of femoral head, form and depth of the hip-socket also assist the revalgisation of femoral neck. Mechanical mistakes, little varization, low medialization of distal femoral fragment e.g., lead to an increase of postoperative CCD-angle; meanwhile damage of the apophyseal or epiphysial line does not affect the revalgisation.