15-year-old male with swelling. Status post ACL reconstruction. MENISCI: There is increased linear branching signal abnormality within the posterior horn of the medial meniscus which extends to involve the body and anterior horn of the meniscus and extends to the tibial and femoral articular surfaces indicating complex tearing. Some of these findings may represent prior tearing or be postoperative in etiology, although this is difficult to ascertain without prior examinations for comparison. There is also increased signal abnormality within the anterior horn medial meniscus which extends to the femoral articular surface consistent with fraying/tearing.There is increased signal abnormality within the posterior horn of the lateral meniscus which extends to the tibial articular surface consistent with undersurface fraying/tearing.ARTICULAR CARTILAGE AND BONE: The lateral compartment appears relatively spared. There is focal partial-thickness articular cartilage degeneration along the medial facet of the patella with a tiny foci of underlying subchondral signal abnormality. Note is made of postsurgical changes consistent with prior ACL graft repair.LIGAMENTS: Postsurgical changes from prior ACL graft repair. There is increased signal abnormality within the graft likely related to revascularization. The fibers of the graft appear intact. The PCL appears intact. The medial and lateral collateral ligaments appear intact. EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
1. Postsurgical changes of prior ACL graft repair as described above. 2. Complex tearing of the medial meniscus and articular cartilage degeneration of the patellofemoral compartment as described above. 3. Small joint effusion.