33-year-old female with pain, evaluate for AVN of the knee MENISCI: The medial and lateral menisci are intact.ARTICULAR CARTILAGE AND BONE: The articular cartilage appears within normal limits.There is extensive red marrow replacement sparing only the epiphyses of the distal femur and proximal tibia. Partially visualized heterogeneous signal abnormalities in the distal diaphysis of the femur and proximal diaphysis of the tibia likely represent bone infarcts.LIGAMENTS: The cruciate and collateral ligaments are intact. EXTENSOR MECHANISM: The quadriceps tendon and patellar tendons are intact.ADDITIONAL
. Extensive red marrow replacement sparing the epiphyses and likely bone infarcts in the tibial and femoral diaphyses, as described above.