- Qualifies for primary Total Ankle Replacement (TAR) per the surgeon and has a diagnosis of one of the following: primary arthritis (e.g. degenerative disease), secondary arthritis (e.g. post-traumatic, avascular necrosis, if minimally 2/3 of the talus is preserved), or systemic arthritis of the ankle (e.g. rheumatoid arthritis, hemochromatosis).