Clinical Presentation

The patient is a 19-year-old man who sustained a twisting injury while playing soccer.

Further Work-up

(A) Radiograph of the knee show an abnormally deep depression over the lateral condylopatellar sulcus (short arrow). A large joint effusion (long arrow) is also present. (B,C) Sagit tal proton density (PD)-weighted and T2-weighted magnetic resonance imaging (MRI) shows complete disruption of the anterior cruciate ligament (ACL: black arrow