Left knee pain, status post left knee arthroscopy/microfracture/partial meniscectomy. Assess for healing, reinjury. Evaluation of the knee is limited on some sequences due to patient motion artifact.MENISCI: The lateral meniscus appears intact. There is truncation of the posterior horn of the medial meniscus medial to its root attachment which I suspect reflects prior partial meniscectomy. However, the majority of the posterior horn of the medial meniscus (with the exception of its root) is replaced with intermediate signal intensity that is new when compared with the prior study. I suspect that this represents extensive degeneration and degenerative tearing of the posterior horn of the meniscus, although I see no discrete fluid-filled meniscal defect. There is also attenuation of the body of the medial meniscus, perhaps reflecting prior partial meniscectomy, with intrasubstance signal likely representing mucoid degeneration. There is slight medial extrusion of the body of the medial meniscus. The anterior horn of the medial meniscus appears normal.ARTICULAR CARTILAGE AND BONE: There is full-thickness degeneration of the articular cartilage along the weight-bearing portion of the medial femoral condyle above and anterior to the degenerated and torn posterior horn of the medial meniscus that appears more extensive on the current study than on the prior study. Signal abnormality in the underlying medial femoral condyle likely represents a combination of degenerative cysts and edema-like signal, and perhaps residual postoperative changes from prior microfracture. There is also full-thickness cartilage loss along the medial aspect of the medial tibial plateau which is new when compared with the prior study. The articular cartilage of the lateral compartment is unremarkable. There is mild subjective thinning of the articular cartilage of the patella compatible with mild degeneration, but I see no discrete fluid filled cartilage defect. There are small medial and patellofemoral compartment osteophytes. A lesion of the proximal tibial diaphysis is incompletely imaged on this study; please refer to the tibia/fibula MRI exam report dictated under a separate accession number.LIGAMENTS: The anterior cruciate ligament appears intact, but is thickened and of increased signal intensity indicating moderate mucoid degeneration. The posterior cruciate ligament is intact. The superficial fibers of the medial collateral ligament are intact. The lateral collateral ligament complex is intact. EXTENSOR MECHANISM: The quadriceps and patellar tendons are intact.ADDITIONAL
1.Progression of cartilage degeneration in the medial tibiofemoral compartment.2.Postoperative changes of the medial meniscus with new diffuse signal abnormality involving the posterior horn which I suspect represents extensive degeneration and degenerative tearing.3.Mucoid degeneration of the anterior cruciate ligament.4.Thin elongated Baker cyst containing intermediate signal intensity that I suspect represent synovitis and/or debris.5.Proximal tibial lesion incompletely imaged on this study; please refer to the tibia-fibula MRI exam report dictated under a separate accession number.