Medial left knee pain.  9 Feb 21 MRI revealed medial & lateral meniscus intact; ACL, PCL, MCL & LCL intact.  Extensor mechanism intact.  CARTILAGE:  medial cartilage intact; mild grade 4 cartilage damage of the lateral femoral condyle.  Moderate grade 4 cartilage damage of the lateral patellar facet & lateral trochlea.  Button osteophyte of the lateral trochlea. Moderate subchondrall edema and moderate subchondral cyctic changes.  BONES:  No contusion or fracture. No worrisome bone lesions.  JOINT SPACE:  No effusion.  No loose bodies.  No evidence of synovitis.  No Baker cyst.  SOFT TISSUES: Negative.  CONCLUSION:  1.  Severe pattellofemoral osteoarthritis.  2.  Mild-to-moderate lateral osteoarthritis.  3.  History of medial pain & clicking suggests a meniscus tear but no demonstrated tear on imaging.