Avulsion Fracture of the Tibial Tuberosity Associated with a Rupture of the Anterior Capsule of the Knee. A case Report.

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Avulsion fractures of the tibial tuberosity in adolescents have been well described. But there is only a few cases that demonstrate an associated rupture of the anterior capsule of the knee. We are reporting on a case of a fifteen-year-old boy who sustained a Watson-Jones type-I fracture with an associated anterior capsular tear while jumping for hurdles. This case was successfully treated by open reduction and internal fixation with two screws and repair of the anterior capsule and patellar retinaculum.The patellar retinaculum was ruptured along the patellar ligament and farther from the distal end of the patella to the epicondyle of the femur. The mechanism of this injury is anatomically related with transverse fibers of the patellar retinaculum and capsular ligaments, whitch are patellofemoral ligaments. If the displacement of the fragment on the avulsion fracture of the tibial tuberosity is remarkable, the associated rupture of the anterior capsule should be considered and then not only reduction and fixation of the fragment but also repair of the patellar retinaculum and the anterior capsule are necessary.
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