51-year-old male with pain and swelling. Evaluate for MCL or ACL injury. MENISCI: No significant abnormality noted.ARTICULAR CARTILAGE AND BONE: There is bone marrow reactive change along the lateral femoral condyle and posterior lateral tibial plateau consistent with pivot shift bone contusions. There is a full-thickness articular cartilage fissure along the lateral facet of the patella. There is underlying bone marrow reactive change within the patella. There is also a focal full-thickness articular cartilage defect and delamination along the lateral aspect of the medial femoral condyle.LIGAMENTS: There is increased signal within the proximal fibers of the superficial and deep bands of the MCL suggestive of partial thickness tearing of the MCL. There is a small amount of fluid within the MCL bursa. There is complete disruption of the proximal fibers of the ACL. The PCL appears intact.EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
Rupture of the proximal fibers of the ACL with partial thickness tearing of the MCL and full-thickness articular cartilage defects. Other findings as described above.