The purpose of this study is to evaluate if bilateral peri-ilial pelvic osteotomies (PIPO) combined with proximal femoral varus derotation osteotomies (VDRO) influenced postoperative complications in children with spastic quadriplegia. Bilateral and unilateral hip subluxation or dislocation secondary to spasticity was present in 29 and 61 patients, respectively. The children were divided into 2 groups: group 1 were to be performed a surgery for unilateral PIPO associated with bilateral VDRO, and group 2 were to be performed a surgery for bilateral PIPO and VDRO. The average age of patients at initiation of surgery was 11.7 years (range, 5-20 years) for group 1 and 10.7 years (range, 5-19 years) for group 2. The hospital stay was similar for group 1 and 2 (P = 0.797), which was 9 days. In group 1, 11 (18%) of 61 children needed an average of 2 days (range, 1-7 days) in the intensive care unit postoperatively, and 4 of these 11 patients were reintubated because of respiratory problems. In group 2, 6 (20%) of 29 children were transferred to the intensive care unit postoperatively for an average of 2 days (range, 1-4 days) and 3 of these 6 children were reintubated because of respiratory problems. In conclusion, respiratory problems and anemia were the most common early postoperative complications, which occur with a similar rate in children with spastic quadriplegia who underwent bilateral or unilateral peri-ilial pelvic osteotomy(ies) combined with proximal femoral osteotomies. We believe that bilateral hip procedures including PIPO, proximal femoral osteotomies, and soft-tissue release can be performed safely in 1 stage and, based on this data, the staged procedure would probably have the same risk as the first procedure.