Reason: Evaluate for acl tear History: knee pain and swelling and instability for weeks post injury MENISCI: There is a complex tear through the posterior horn of the medial meniscus with vertical and horizontal components extending to the inferior and superior articular surfaces. The lateral meniscus appears grossly intact, however there is mild edema of the fibers at the anterior root.ARTICULAR CARTILAGE AND BONE: There is focal discontinuity of the cortex of the lateral tibial plateau with adjacent edema, consistent with a small avulsion fracture. There is increased T2 signal intensity in the lateral femoral condyle and posterior medial and lateral tibial plateau, consistent with bone contusion. The articular cartilage is intact.LIGAMENTS: There is focal discontinuity in the ACL fibers with increased T2 signal intensity, consistent with complete ACL tendon rupture. The PCL is intact. The LCL and MCL are also intact. EXTENSOR MECHANISM: The Achilles and quadriceps tendons are intact.ADDITIONAL
1. Complete ACL tendon rupture.2. Complex tear through the posterior horn of the medial meniscus.3. Segond fracture with lipohemarthrosis.