42-year-old male with persistent left knee pain unresponsive to conservative therapy. MENISCI: There is a complex but predominantly horizontal tear of the posterior horn of the medial meniscus with branching signal abnormality which extends to both the tibial and femoral articular surfaces. The signal within portions of the tear approaches that of fluid, suggesting a relatively large and potentially unstable tear. The body and anterior horn of the medial meniscus appear intact. There is a small undersurface tear of the free edge of the body of the lateral meniscus. Blunting of the undersurface of the free edge of the posterior horn may represent an additional tear.ARTICULAR CARTILAGE AND BONE: There is a vertical fracture through the lateral aspect of the patella with clefts in the overlying articular cartilage. There is an additional cleft in the articular cartilage just lateral to the median eminence of the patella as well as superficial fraying of the articular cartilage of the medial facet of the patella. There is degeneration of the articular cartilage of the lateral tibial plateau beneath the posterior horn of the lateral meniscus. The articular cartilage of the medial compartment appears intact.LIGAMENTS: The cruciate and collateral ligaments appear intact. EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
1. Nondisplaced patellar fracture with adjacent soft tissue injury as described above.2. Medial and lateral meniscus tears.3. Cartilage defects/degeneration as described above.4. Moderate sized joint effusion.