Reason: previous knee xray which showed bone infarction, Hx of Ph+ ALL, s/p stem cell transplant, and chronic steroid use for GVHD History: Left knee pain and crepitus MENISCI: The lateral meniscus appears intact. The medial meniscus appears intact.ARTICULAR CARTILAGE AND BONE: There is serpentine signal abnormality within the weightbearing surface of the lateral femoral condyle as well as within the medial femoral condyle, posteriorly, consistent with avascular necrosis/osteonecrosis. There is no evidence of subchondral collapse. No full-thickness or near full-thickness articular cartilage defects are identified.LIGAMENTS: The cruciate and collateral ligaments appear intact. EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
Avascular necrosis/osteonecrosis of the distal femur as described above. Small joint effusion.