Patellar dislocation and instability Note that the exam is limited by motion artifact.MENISCI: There is mild intrasubstance signal within the anterior horn of the lateral meniscus and mild attenuation of the posterior horn of the medial meniscus but there is no discrete meniscal tear.ARTICULAR CARTILAGE AND BONE: Evaluation of the articular cartilage is limited by motion. There appears to be mild diffuse thinning of the articular cartilage of the patella superiorly but no focal fluid-filled tear is identified. There is mild subjective thinning of the articular cartilage of the lateral tibial plateau but again no fluid-filled defect is appreciated. There is poorly defined signal abnormality within the intercondylar eminence of the tibia which is likely degenerative in nature. Patchy foci of residual red marrow are seen in the distal femur.LIGAMENTS: The cruciate and collateral ligaments are intact. There is thickening and irregularity of the MPFL particularly at its attachment on the patella suggesting chronic tearing.EXTENSOR MECHANISM: There is increased signal intensity of the quadriceps tendon indicating tendinosis. The patellar tendon is intact. There is approximately 2 cm of lateral subluxation of the patella relative to the center of the femoral trochlea. There is no femoral trochlear dysplasia or patella alta. The TT to TG distance is elevated measuring 2.6 cm.ADDITIONAL
Lateral subluxation of the patella with increased TT to TG distance and chronic MPFL tearing. Additional findings are described above.