Male 46 years old Reason: evaluate for severe chondromalacia, ligamentous injury History: severe left knee pain, patellofemoral pain, sensations of instability. MENISCI: Mild poorly defined intrasubstance signal within the posterior horn and body of the medial meniscus suggesting degeneration. We see no discrete meniscal tear. There is slight medial extrusion of the body of the medial meniscus. Lateral meniscus is intact.ARTICULAR CARTILAGE AND BONE: There is degeneration of the articular cartilage of the patella. There is full-thickness cartilage loss along the far lateral facet of the patella, similar to the prior exam. There is relatively mild-moderate degeneration affecting the remaining patellar cartilage. There is diffuse thinning of the articular cartilage along the weightbearing surface of the medial compartment with full-thickness degeneration along the medial femoral condyle above the posterior horn of the medial meniscus, progressed from the prior study. There is also osteophyte formation with overlying cartilage thinning along the medial femoral condyle anteriorly. Articular cartilage of the lateral compartment is relatively spared.There is poorly defined edema type signal within the intercondylar eminence posteriorly, anterior to the attachment of the PCL. This is likely degenerative in etiology and is new from the prior exam.LIGAMENTS: ACL is intact. The PCL is intact, although there is a small collection of fluid signal intensity within the ligament which may represent a small ganglion. The MCL and lateral collateral ligament complex are intact. EXTENSOR MECHANISM: Within the quadriceps tendon there is focal intermediate signal intensity which may represent tendinosis or an old tear, similar to the prior exam. The patellar tendon is intact.ADDITIONAL
1.Degeneration of the articular cartilage predominantly affecting the patellofemoral and medial compartments, which has progressed in the medial compartment.2.No findings to suggest acute knee injury.3.Joint effusion and other findings above.