Check for ligamentous tear. Knee pain MENISCI: No significant abnormality noted.ARTICULAR CARTILAGE AND BONE: Mild thinning largely observed in the lateral femoral compartment with associated more moderate an irregular changes involving the undersurface of the patella. The patellar compartment also demonstrates associated subchondral cysts and focal full-thickness tear near the apex. Underlying patellar edema and more focal degenerative and edematous marrow changes are otherwise observed involving the tibial spines and mid plateau.LIGAMENTS: Collateral ligaments are intact as well as the PCL. The ACL however demonstrates diffuse increased signal and thickening representing a severe sprain given intact fibers are observed throughout (best appreciated on axial projection). Small immediately adjacent posterior periligamentous small cyst is observed (image 8 series 8). Retinaculum appears intact EXTENSOR MECHANISM: No significant abnormality noted.ADDITIONAL
Severe ACL sprain with otherwise scattered focal cartilaginous degenerative changes, see details provided. 