Evaluate for lateral meniscal tear. Knee pain with sports injury one month ago, with stiffness. MENISCI: No significant abnormality noted.ARTICULAR CARTILAGE AND BONE: We see no articular cartilage deformity or bone marrow edema.LIGAMENTS: There is abnormal thickening and increased signal intensity of the anterior cruciate ligament, particularly involving the posterior and proximal fibers. This is concerning for a tear, at least involving the posterolateral bundle, but we cannot exclude a complete tear of the fibers of the proximal ligament. This may represent subacute injury given lack of bone marrow edema. Mucoid degeneration of the ligament is considered less likely. The posterior cruciate, lateral collateral and medial collateral ligaments are intact.EXTENSOR MECHANISM: No significant abnormality noted.ADDITIONAL
Abnormal thickening and increased signal intensity of the anterior cruciate ligament is suggestive of at least a partial thickness tear despite absence of bone contusions and joint effusion. We see no meniscal tear.