[Severe upper femoral epiphysiolysis. Invasive reduction by Dunn's technic: 11 cases].

Eleven cases of slipped upper femoral epiphysis have been corrected and fixed, using Dunn's technique. Seven were chronic slips and four were acute slips with severe displacement. The children were aged between 11 and 15 years. The displacement was measured on lateral radiographs of the femoral neck and was type II in the acute cases and type III in chronic cases, ranging between 50 degrees and the maximum possible displacement. Acute cases were operated on between 2 and 15 days following the onset of the condition, and chronic cases were operated on between 2 and 14 months following the onset of the condition. Three acute cases were not reduced by closed methods, once because of the delay of 15 days and twice because of a deformity of the neck. In the fourth acute case closed reduction was insufficient. The follow-up was between 3 months and 10 years. There was one case of sepsis and one chondrolysis.