30-year-old female with lateral knee pain. Evaluate for ligamentous injury. MENISCI: There is increased linear signal abnormality within the posterior horn of the lateral meniscus which extends to the tibial and femoral articular surfaces, consistent with a vertical tear, involving the insertion of the Wrisberg ligament suggesting a "Wrisberg rip". The anterior horn of the lateral meniscus appears intact. The medial meniscus appears intact.ARTICULAR CARTILAGE AND BONE: There is bone marrow edema type signal abnormality within the medial femoral condyle and medial tibial plateau. There is a focal articular cartilage defect and delamination along the medial aspect of the medial facet of the femoral trochlea. There is a subcentimeter focus of decreased signal abnormality just anterior to the medial facet of the femoral trochlea which likely represents an articular cartilage fragment within the joint space. There is underlying subchondral marrow signal abnormality suggesting bone contusion or subchondral fracture.LIGAMENTS: There is irregularity and increased signal abnormality about the midsubstance and distal fibers of the ACL consistent with at least a partial tear of the ACL. The PCL appears intact. The lateral collateral ligament proper and the distal biceps femoris tendon are indistinct suspicious for LCL rupture. There is no significant retraction of the biceps femoris. The MCL appears intact.EXTENSOR MECHANISM: The extensor mechanism appears intact. ADDITIONAL
1. Tearing of the ACL and components of the LCL as described above.2. Vertical tear of the posterior horn of the lateral meniscus extending from the insertion site of the Wrisberg ligament, consistent with a "Wrisberg rip".3. Articular cartilage defect and delamination along the medial facet of the femoral trochlea. 4. Small joint effusion. Other findings as described above.