León SA, et al. - One hundred and thirteen modified trochanteric slide osteotomies and 73 extended trochanteric osteotomies performed between 2008 and 2016 were analyzed by the experts in order to assess the osteotomy length on proximal greater trochanter (GT) migration. GT migration distance and osteotomy length were negatively related to each other. Against GT migration >1 cm, longer osteotomy length was protective in nature. An optimal cutoff osteotomy length for the prediction of the GT migration >1 cm was 9.8 cm. Diminished mean GT migration and greater mean union rate was exhibited by those who were using at least one distal wire under the lesser trochanter and vastus ridge, among osteotomies <10 cm. Hence, a greater risk for the development of proximal GT migration >1 cm was demonstrated by osteotomies shorter than 10 cm. Further, in order to reduce the amount of GT migration, a distal cerclage wire below the lesser trochanter and vastus ridge could be a helping hand.