18-year-old female with left knee pain history of left ACL reconstruction, lateral meniscal repair and partial medial meniscectomy. Evaluate for failed ACL reconstruction. MENISCI: Note is made of branching linear increased signal abnormality traversing the posterior horn of the lateral meniscus which extends to the femoral and tibial articular surface which fills with intra articular gadolinium, consistent with a complex tear. Additionally, there is a horizontal component which fills with intra-articular gadolinium which extends into the body of the meniscus also consistent with re-tearing. The anterior horn appears intact. No gadolinium filled defects are identified within the medial meniscus to suggest a re-tear. There is deformity and increased signal abnormality within the body as well as the posterior horn of the medial meniscus near its root which extends to the tibial and femoral articular surfaces, which may represent post-surgical changes from prior meniscectomy versus prior tearing of the meniscus, appearing similar to the prior study.ARTICULAR CARTILAGE AND BONE: Note is made of osseous tunnels within the distal femur and proximal tibia consistent with prior ACL graft repair. Note is made of trace bone marrow edema type signal abnormality within the posterior aspect of the lateral tibial plateau which may represent a contusion.LIGAMENTS: There is complete rupture of the ACL graft. The PCL is buckled but appears intact. The medial and lateral collateral ligament appear intact.EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
1. Findings consistent with rupture of the ACL graft.2. Findings consistent with a complex re-tear of the posterior horn of the lateral meniscus.3. Findings consistent with postsurgical changes of prior medial meniscectomy, without evidence of a gadolinium-filled defect to confirm a re-tear.4. Bone marrow edema within the posterior aspect of the lateral tibial plateau consistent with a contusion.