Reason: R knee patellar instability. Measure TT-TG, assess for chondral injury, assess MPFL. History: R knee patellar instability MENISCI: The medial and lateral menisci are normal.ARTICULAR CARTILAGE AND BONE: There is lateral translation of the patella with respect to the femoral trochlea. The femoral trochlea is shallow, indicating femoral trochlear dysplasia. The tibial tubercle to the trochlear groove distance measures 21 mm which is abnormally increased. The Insall-Salvati ratio is 1.5, indicating patella alta. Note is made of a supratrochlear spur. There is no abnormal bone marrow signal. The articular cartilage of the knee is intact.LIGAMENTS: The cruciate and collateral ligaments are normal. EXTENSOR MECHANISM: The quadriceps and patellar tendons are normal.ADDITIONAL
1. Mild femoral trochlear dysplasia and lateral translation of the patella with respect to the femoral trochlea. Abnormally increased tibial tubercle trochlear groove distance.2. Patella alta.