Male 53 years old. Evaluate for ACL re-rupture in a patent with left knee pain, positive Lachman and instability. MENISCI: There is attenuation of the anterior horn of the medial meniscus that may reflect prior partial meniscectomy. This appears similar to the prior study and we see no discrete meniscal tear.ARTICULAR CARTILAGE AND BONE: There is bone marrow edema within the lateral tibial plateau posteriorly and within the lateral femoral condyle above the anterior horn of the lateral meniscus representing bone contusions. Linear low signal intensity seen within the lateral femoral condyle edema on the T1 coronal sequence may represent a nondisplaced subchondral fracture but this is equivocal. There is also edema within the medial tibial plateau posteriorly with a nondisplaced fracture extending obliquely through the posterior lip of the medial tibial plateau.There is full-thickness degeneration of the articular cartilage of the femoral trochlea centrally. Mild heterogeneity of the articular cartilage of the patella as well as the lateral tibial plateau represents relatively mild cartilage degeneration.LIGAMENTS: Again seen are surgical changes of prior ACL reconstruction; however the graft has ruptured. The PCL, MCL and lateral collateral ligament complex are intact. EXTENSOR MECHANISM: The extensor mechanism is intact.ADDITIONAL
1.Rupture of ACL graft.2.Bone contusions as described above as well as a nondisplaced fracture through the posterior lip of the medial tibial plateau.3.Other findings as above.