Radiologic case study. Plain film manifestations of ACL injury

ACL injuries are common but often difficult to diagnose acutely by clinical examination alone. The Segond fracture, avulsion fracture of the anterior tibial spine, impacted lateral femoral condyle fracture, and fracture of the posterior lateral tibial plateau are radiographic signs often associated with ACL injury. It is important to recognize the significance of these subtle abnormalities and if found, further evaluation should be done to identify the presence and the extent of ACL injury as well as potential injury to other components of the knee joint. MRI is the imaging method of choice in these patients. Early diagnosis and treatment of knee joint abnormalities may help prevent or diminish long-term disability.