Bone cortical discontinuity at the posterior border of the right talus is a description of the condition of the talus on imaging. The causes of bone cortical discontinuity include fractures, bone tumors, tuberculosis, or bacterial infections, which is a pathological finding that requires aggressive diagnosis and treatment. Because the bone cortex is the dense bone around the periphery of the bone, the texture is relatively hard. 1. Fracture: after trauma, it may lead to bone discontinuity in the right talus injury, and it may also damage the tendons and ligaments around the talus. 2. Bone tumor: Bone tumor can cause local bone destruction, and tumor cells gradually erode the posterior border of the right talus, which can also cause pathological fracture, and further lead to corresponding images and clinical manifestations. 3. Tuberculosis: Tuberculosis bacteria is a specific infection, which can also lead to bone destruction of the right posterior border of the talus. This can be visualized as a cortical discontinuity of the right posterior border of the talus. 4. Bacterial infection: When bacteria enter the talus through the outside world or the bloodstream, they can cause bacterial inflammation of the talus, resulting in osteomyelitis of the talus, which can lead to bone destruction when the inflammation is severe. There is a discontinuity in the cortex of the right posterior border of the talus on the image. The presence of cortical discontinuity at the posterior margin of the talus requires prompt medical observation and standardized treatment under the guidance of the clinician after diagnosis of the condition.