Pediatric pelvic fractures.

Pediatric pelvic fractures account for only 1% to 2% of fractures seen by orthopaedic surgeons who treat children. They are typically associated with high-energy trauma, requiring a comprehensive workup for concomitant life-threatening injuries. Anteroposterior radiographs and rapid-sequence computed tomography are the standards of diagnostic testing to identify the fracture and recognize associated injuries. Treatment is individualized based on patient age, fracture classification, stability of the pelvic ring, extent of concomitant injuries, and hemodynamic stability of the patient. Most pelvic injuries in children are treated nonsurgically, with protected weight bearing and gradual return to activity. Open reduction and internal fixation is required for acetabular fractures with >2 mm of fracture displacement and for any intra-articular or triradiate cartilage fracture displacement >2 mm. To prevent limb-length discrepancies, external fixation is necessary for pelvic ring displacement >2 cm. Fractures involving immature triradiate cartilage may lead to growth disturbance of the acetabulum, resulting in acetabular dysplasia, hip subluxation, or hip joint incongruity. Osteonecrosis of the femoral head may develop after acetabular fractures associated with hip dislocation. Other complications include myositis ossificans and neurologic deficits secondary to sciatic, femoral, and/or lumbosacral plexus nerve injuries.