Osteoarticular tuberculosis is often misdiagnosed as other disease because of a rare incidence and nonspecific clinical and radiographic presentation. Therefore, it is important to know clinical and radiographic presentations of osteoarticular tuberculosis and to diagnose in early phase. Especially, fistula formation is one of the most important clinical features which suspects osteoarticular tuberculosis. We report a case of ankle tuberculosis to be misdiagnosed as subtalar osteoarthritis and performed subtalar arthrodesis.