Associated injury complicated by pediatric lower limb shaft fractures and clinical efficacy of flexible stainless-steel intramedullary nailing in children less than 15 years old.

Although pediatric lower limb shaft fractures are common, little is known about associated injuries. The purpose of this study was to examine associated injuries complicated by pediatric lower limb shaft fractures and the efficacy of surgical treatment using a flexible stainless-steel intramedullary Ender nail in children less than 15 years old. This is a retrospective review of 29 children younger than 15 years old who were diagnosed with femoral or tibial shaft fractures and treated using Ender nails from 2005 to 2016. Baseline data, etiology, associated injuries, fracture site and patterns, operative and post-operative assessment were evaluated. The average age of the patients was 9.0 years, and mean follow-up was 18.2 months. Eleven patients (79%) had associated injury. At the final follow up, six patients (43%) sustained complications associated with the insertion area of the nail. There was no evidence of deep infection or nonunion at either fracture site. The clinical results were excellent in 10 (67%) fractures, and good in 5 (33%) fractures, based on the modified Flynn criteria. Almost all patients with a femoral fracture had an associated injury including abdominal visceral injury, cerebral contusion or other fractures. This study indicated good clinical and functional outcomes. On the other hand, the minor complications rate was high. Nevertheless, elastic stable intramedullary nailing recently has become available in Japan, and a prospective and comparative study is needed.