Female, 40 years old. Right knee pain and locking since accident x 2 years ago An old MR coil was used due to body habitus, and the patient was having muscle spasms during the exam; therefore, the images are somewhat degraded.MENISCI: The medial and lateral menisci are normal, without evidence of tear.ARTICULAR CARTILAGE AND BONE: There is diffuse thinning of the medial patellar facet and near complete cartilage loss on the lateral patellar facet, with associated underlying subchondral cysts and marrow reactive changes.LIGAMENTS: The cruciate and collateral ligaments are unremarkable. EXTENSOR MECHANISM: No significant abnormality noted.ADDITIONAL
Near complete cartilage loss of the lateral patellar facet, with underlying marrow reactive changes and subchondral cysts.