Posterior cruciate ligament avulsion associated with an epiphyseal fracture of the proximal fibula: a case report of a 13-year-old child.

Posterior cruciate ligament (PCL) avulsion fractures are rare among the pediatric population. Reported PCL injury incidence varies from 1 to 40% depending on the study population. PCL lesions can be isolated or associated with other ligamentous lesions, which makes their management challenging. Knee ligament reconstruction is essential to restore knee stability and, thus, prevent future menisci and cartilage degeneration. However, surgical management of these injuries can lead to subsequent iatrogenic growth disturbances. Case presentation: The authors describe the case of a 13-year-old child involved in a sports accident causing a PCL avulsion fracture associated with an epiphyseal fracture of the proximal fibula resulting from an incomplete peel-off injury of the lateral collateral ligament. The patient was scheduled for open reduction and internal fixation on the same day of the presentation. A long-leg cast was then applied for 6 weeks. By 3 months postoperatively, the patient regained full range of motion, and return to sport was possible 6 months after the surgery. Conclusion: In children and adolescents, PCL avulsion fractures are often associated with other occult lesions. Although good functional and clinical outcomes using operative management for these lesions are reported, specific treatment recommendations are lacking in skeletally immature patients.