Knee pain, prior medial meniscectomy MENISCI: Again seen is attenuation of the body and posterior horn of the medial meniscus that likely represents a combination of prior partial meniscectomy and chronic degenerative tearing. The more discrete linear tears seen on the prior exam are not as evident on the current study and there appears to be further loss of tissue along the free edge of the body of the meniscus which could represent interval partial meniscectomy or progression of attritional tearing. The anterior horn of the medial meniscus appears intact although a small cyst is seen anterior to it.There is globular intrasubstance signal within the anterior horn of the lateral meniscus representing mucoid degeneration but this is similar to the prior exam. The body and posterior horn of the lateral meniscus appear intact.ARTICULAR CARTILAGE AND BONE: There has been progression of osteoarthritis of the medial compartment with regions of full-thickness cartilage loss along the medial aspect of the medial femoral condyle and new subchondral cyst formation. There is full-thickness fissuring of the articular cartilage of the patella and femoral trochlea centrally which is new from the prior exam. The articular cartilage of the lateral femoral condyle subjectively appears thinned but we see no fluid-filled full-thickness defect. Small cysts are identified within the intercondylar eminence of the tibia which are likely degenerative in nature. There are small tricompartmental osteophytes.LIGAMENTS: The ACL is thickened and ill-defined with increased signal intensity likely representing severe mucoid degeneration with prominent cruciate ganglia proximally. This appears progressed from the prior exam with new partial thickness tearing of the distal fibers of the ACL. The PCL, MCL, and LCL are intact.EXTENSOR MECHANISM: No significant abnormality noted.ADDITIONAL
1. Medial meniscal abnormalities further detailed above which likely represent a combination of prior meniscectomy changes and progression of chronic degenerative tearing. Intrasubstance degeneration of the lateral meniscus appears similar to the prior exam.2. Progression of osteoarthritis of the medial and patellofemoral compartments.3. Progression of mucoid degeneration of the ACL with new partial-thickness tearing of the distal fibers.