Lateral knee pain MENISCI: There is abnormal signal and morphology of the posterior horn of the medial meniscus at and near its root indicating complex tearing and fragmentation. As a result, there is mild medial extrusion of the body of the meniscus into the medial gutter. These changes are superimposed upon additional increased signal within the meniscus representing intrasubstance degeneration. Furthermore, there is vertically oriented abnormal signal at the junction of the body and posterior horn of the meniscus which extends to the tibial articular surface, representing an additional small tear.The lateral meniscus is intact.ARTICULAR CARTILAGE AND BONE: There is moderate degenerative articular cartilage loss with areas of full-thickness loss along both the medial and lateral patellar facets. There is associated underlying subchondral cystic change. Focal degeneration of the articular cartilage of the medial facet of the femoral trochlea is also noted inferiorly.There is partial thickness articular cartilage loss of the medial femoral condyle anterior to the posterior horn of the medial meniscus. There is focal full-thickness degeneration of the weightbearing portions of the medial tibial plateau with associated underlying degenerative marrow signal.There is thinning of the articular cartilage of the lateral femoral condyle at the level of the anterior horn of the meniscus. Otherwise the cartilage of the lateral compartment is preserved.LIGAMENTS: There is slightly increased signal of the ACL representing mucoid degeneration with extension of this abnormal signal to the ACL insertion on the tibial plateau. The ACL and remaining ligamentous structures are intact. EXTENSOR MECHANISM: There are enthesopathic changes of the quadriceps tendon upon the superior aspect of the patella. The extensor mechanism is otherwise intact.ADDITIONAL
1. Intact lateral meniscus.2. Medial meniscal tears as described above.3. Articular cartilage loss and degeneration of the medial and patellofemoral compartments further detailed above.4. Small joint effusion and Baker's cyst. 5. Mucoid degeneration of the ACL with other findings described above.