Medial joint pain MENISCI: There is attenuation of the posterior horn of the medial meniscus which may reflect changes of prior partial meniscectomy versus chronic attritional tearing. There is branching intermediate signal of the posterior horn of the medial meniscus which extends to both the tibial and femoral articular surfaces compatible with tear although this could also represent residual intrasubstance degenerative signal following meniscectomy. We suspect there is at least undersurface tearing of the posterior horn, however. There is mild medial extrusion of the body of the medial meniscus which also appears attenuated. The anterior horn of the medial meniscus is intact.There is attenuation of the posterior horn of the lateral meniscus which again may reflect changes of prior partial meniscectomy or chronic attritional tearing. There is obliquely and vertically oriented intermediate signal within the posterior horn which extends to the tibial articular surface which we suspect represents undersurface tearing although could represent residual intrasubstance degenerative signal following partial meniscectomy.ARTICULAR CARTILAGE AND BONE: There is moderate to severe degeneration of the articular cartilage of the weightbearing portion of the medial femoral condyle posteriorly with areas of full-thickness cartilage loss. A small focus of degenerative subchondral signal intensity is seen within the medial tibial plateau with mild degeneration of the overlying articular cartilage. There is moderate degeneration of the articular cartilage of the lateral compartment with full-thickness cartilage loss along the lateral femoral condyle and lateral tibial plateau adjacent to the posterior horn of the lateral meniscus. There is moderate degeneration of the articular cartilage of the patellofemoral joint. There are tricompartmental osteophytes.LIGAMENTS: The patient has undergone ACL reconstruction. Graft fibers can be traced from the femoral interference screw to the tibial interference screw and the graft itself is slightly ill-defined with intermediate signal intensity representing degeneration. Additional adjacent intermediate-low signal intensity is thought to represent scarring. Degenerative signal intensity is also seen within the lateral collateral ligament proximally with the remaining major ligaments intact.EXTENSOR MECHANISM: No significant abnormality noted.ADDITIONAL
1. Medial and lateral meniscus abnormalities as described above likely represent a combination of postmeniscectomy changes and degenerative tearing.2. Surgical changes of ACL reconstruction with intact graft showing features of degeneration and adjacent scarring.3. Osteoarthritis further detailed above; loose body noted within a Baker's cyst.