18-year-old male with pain. History of previous ACL reconstruction. Evaluate for chondral injury. MENISCI: The medial meniscus appears intact. The lateral meniscus appears intact.ARTICULAR CARTILAGE AND BONE: The articular cartilage of the medial tibiofemoral compartment appears intact. There is a focal partial thickness articular cartilage cleft/fissure within the posterior aspect of the lateral tibial plateau, beneath the posterior horn of the meniscus. The articular cartilage of the lateral tibiofemoral compartment otherwise appears intact. No full-thickness or near full-thickness articular cartilage defects are identified. There is increased bone marrow signal abnormality within the patella which may reflect postsurgical change. There is increased signal abnormality within the posterior aspect of the lateral tibial plateau which may reflect bone contusion from prior injury.LIGAMENTS: The cruciate and collateral ligaments appear intact. Note is made of postsurgical changes of prior ACL graft reconstruction. The graft appears intact. There is decreased signal abnormality along the anterior aspect of the ACL graft which appears most consistent with anterior arthrofibrosis versus synovitis.EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
1. Findings consistent with prior ACL graft reconstruction. The graft appears intact. Signal abnormality along the anterior aspect of the ACL graft likely represents anterior arthrofibrosis versus a synovitis.2. Focal partial thickness articular cartilage cleft/fissure along the lateral tibiofemoral compartment as described above.3. Small joint effusion.