Unusual Presentation of Tuberculosis of Subtalar Joint

INTRODUCTION: A case of seronegative variety of subtalar joint arthritis was treated with subtalar joint fusion surgery. In spite of perfect execution of surgery, fusion did not occur. It was only at a revision surgery that case could be diagnosed as a case of tuberculosis of subtalar joint. CASE REPORT: Elderly female was operated for seronegative subtalar joint arthritis with fusion plus primary bone grafting. Fusion did not progress in spite of every added efforts such as extended immobilization, calcium supplements, and antibiotic therapy. Revision surgery was undertaken considering the reason of failure being a low-grade infection. At a revision surgery, case was diagnosed as a case of tuberculosis of subtalar joint, a very rare presentation. Fusion succeeded just with addition of antituberculous therapy supported with short-term immobilization. CONCLUSION: Tuberculosis of the foot and ankle joints, though are rare, they can mimic like many other disorders. In developing countries, a high index of suspicion is warranted to early diagnose it.