Case Report : 유소년 야구선수에서 발생한 내상과 견인 골단 내 견열 골절

Overuse elbow injuries in young throwing athletes are generally defined as ‘Little Leaguer`s elbow’. Repetitive submaximal valgus forces on the medial epicondylar apophysis in such athletes can result in apophyseal separation or chronic apophyseal fragmentation, which would usually take over more than a year to heal. We report of a unique case of a 13-year-old male baseball pitcher who, due to the traction of the medial collateral ligament, presented with an acute intra-apophyseal avulsion fracture of the medial epicondyle. The fracture was successfully healed using a long arm cast, and correct union was confirmed by 3 dimensional computed tomography at 8 weeks post-trauma. This acute avulsion fracture is a variant of Little Leaguer`s elbow and should be distinguished in terms of diagnosis and treatment from common lesion such as chronic fragmentation of the medial epicondylar apophysis.