Osteochondral avulsion fracture of the anterior cruciate ligament femoral origin in a 10-year-old child: a case report.

OBJECTIVE

To describe the case of a 10-year-old football player who sustained a comminuted osteochondral avulsion fracture of the femoral origin of the anterior cruciate ligament (ACL) via a low-energy mechanism.

BACKGROUND

In children, both purely cartilaginous and osteochondral avulsion fractures have been described; most such ACL avulsions are from the tibial eminence. In the few previous case reports describing femoral osteochondral avulsion fractures, high-energy injury mechanisms were typically responsible and resulted in a single fracture fragment.

DIFFERENTIAL DIAGNOSIS

Femoral osteochondral avulsion fracture at the ACL origin, femoral cartilaginous avulsion fracture at the ACL origin, midsubstance ACL tear, meniscal tear.

TREATMENT

Sutures and a button were used to repair the comminuted fragments. Postoperatively, a modified ACL reconstruction rehabilitation program was instituted.

UNIQUENESS

Most injuries of this nature in youngsters are caused by a high-energy mechanism of injury, result in an osteochondral avulsion fracture of the tibial eminence, and involve a single fracture fragment.

CONCLUSIONS

Although they occur infrequently, ACL femoral avulsion fractures in children can result from a low-energy injury mechanism. Identifying the mechanism of injury, performing a thorough physical examination, and obtaining appropriate diagnostic studies will enable the correct treatment to be implemented, with the goal of safely returning the athlete to play.