23-year-old male with right knee pain and swelling for 3 weeks s/p twisting injury. History of ACL and lateral meniscus tears repaired in 2012. MENISCI: There is loss of the expected configuration of the posterior horn of the lateral meniscus, which is replaced by meniscal fragments and fluid. Findings are suspicious for re-tear. The medial meniscus and the anterior horn of the lateral meniscus are unremarkable.ARTICULAR CARTILAGE AND BONE: Loss of lateral compartment articular cartilage overlying the torn posterior horn of the lateral meniscus. The remaining articular cartilage within the knee joint is unremarkable. Mild bone marrow edema is noted in the lateral femoral condyle.LIGAMENTS: Postsurgical changes status post ACL reconstruction with intact graft. The PCL and collateral ligaments are intact.EXTENSOR MECHANISM: The extensor tendons are intact.ADDITIONAL
Findings compatible with re-tear of the posterior horn of the lateral meniscus, with loss of overlying articular cartilage and mild associated bone marrow edema.