Reason: eval for meniscal tear; patellar tendon tear; articular cartilage defect History: knee patellar dislocation, subluxation and tendonitis with chronic pain unresponsive to time and therapy MENISCI: The medial and lateral meniscus appear intact.ARTICULAR CARTILAGE AND BONE: No full-thickness or near full-thickness articular cartilage defects are identified along the medial or lateral compartments. Note is made of linear decreased signal abnormality affecting the articular cartilage along the lateral facet of the patella likely representing a full-thickness articular cartilage fissure (image 15; series 7). There is a tiny amount of increased bone marrow signal abnormality within the posterior aspect of the lateral tibial plateau which may represent a resolving contusion.LIGAMENTS: There is partial thickness tearing involving the proximal fibers of the ACL (image 17; series 7). The PCL appears intact. The MCL and LCL appear intact. EXTENSOR MECHANISM: The extensor mechanism appears intact. The medial retinaculum appears intact, although the proximal fibers are not reliably visualized without fat suppression on axial images.ADDITIONAL
1. Partial tear of the proximal fibers of the ACL which may be subacute or chronic in etiology.2. Full-thickness articular cartilage fissure along the lateral facet of the patella. Edema within the superior aspect of Hoffa's fat pad. These findings can be seen in patellofemoral instability.