Fig. 2From: Comparison of the modified Smith-Petersen (S-P) and ilioinguinal (I-I) approaches for periacetabular osteotomy in adult developmental dysplasia of the hip: a retrospective studya Incisions of the modified Smith-Petersen (red line) and ilioinguinal approach (blue line). b–d The Bernese periacetabular osteotomy. b Four periacetabular osteotomies and a controlled fracture. c Fixation of the reoriented fragment. d The posterior column of the true pelvis remains intact maintaining stability Back to article page