Reason: Rule out internal derangement History: left knee swelling, popping, buckling MENISCI: There is a horizontal cleavage tear through the posterior horn of the lateral meniscus. The medial meniscus appears grossly intact.ARTICULAR CARTILAGE AND BONE: There are focal full-thickness defects of the articular cartilage of the medial facet of the trochlea with underlying increased T2 signal, consistent with a degenerative subchondral cyst. There are similar changes along the articular surface of the lateral tibial plateau. There is T1 hypointense signal throughout the distal femoral and proximal tibial metaphysis, consistent with residual red marrow.LIGAMENTS: The ACL, MCL, PCL, and LCL are intact. EXTENSOR MECHANISM: The quadriceps and patellar tendons are intact.ADDITIONAL
Horizontal cleavage tear of the posterior horn of the lateral meniscus and degenerative changes as described above.