Subchondral fracture line consistent with subchondral insufficiency fracture in the load-bearing area of the medial tibial with bone marrow oedema that extends into the subchondral cortical bone. There is also extrusion of the medial meniscus that shows degenerative features of the posterior horn. Small amount of joint effusion accompanies. The cruciate ligaments, collateral ligaments, and external meniscus are normal.