Talar dome lesion what is a talar dome lesion the ankle joint is composed of the bottom of the tibia shin bone and the top of the talus ankle bone the top of the talus is dome shaped and is completely covered with cartilage a tough rubbery tissue that enables the ankle to move smoothly. The ankle is a complex joint consisting of the tibia talus and fibula bones the most common bone in the ankle to have cartilage injury is the talus the cartilage of the talus is like any other articular cartilage and is arranged similarly to that in other weight bearing joints it is thought that the ankle joint is less likely to develop degenerative osteoarthritis than the hip due to its . Osteochondral lesion of the talus cartilage damage of the ankle can occur from a traumatic fracture or ankle sprain when the bones in the ankle joint hit each other damaging the cartilage surface the initial pain may resolve but the pain often comes back during exercise with possible locking of the joint. Osteochondral lesions or osteochondritis dessicans can occur in any joint but are most common in the knee and ankle such lesions are a tear or fracture in the cartilage covering one of the bones in a joint the cartilage can be torn crushed or damaged and in rare cases a cyst can form in the cartilage. New mri techniques for studying the cartilage such as volumetric quantitative analysis dgemric mapping t1 rho mapping t2 mapping and mri using sodium 23 enable access to the microstructure and indirectly to fundamental characteristics of the ankle cartilage thereby improving the diagnosis and treatment of chondral and osteochondral
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