51-year-old female with left knee mechanical locking. MENISCI: No significant abnormality noted.ARTICULAR CARTILAGE AND BONE: Extensive subchondral cystic changes are noted about the femoral side of the patellofemoral joint. There is associated bone marrow edema of the medial facet on the patellar side of the patellofemoral joint. osseous cystic changes are also noted about the medial compartment where there is generalized thinning of the underlying hyaline cartilage. LIGAMENTS: The cruciate and collateral ligaments are intact.EXTENSOR MECHANISM: The extensor mechanism is intact. ADDITIONAL
Osteoarthritic changes and chondromalacia as described above particularly noted at the patellofemoral joint.