Osteonecrosis of the Talus

Osteonecrosis of the talus (ONT) refers to the death of osteocytes and subsequent structural changes leading to talus collapse and secondary ankle joint osteoarthritis. ONT is a rarer disease than osteonecrosis of the femoral head (ONFH); however, it is a significant clinical challenge with an uncertain long-term prognosis [1, 2]. In this chapter, we review ONT, describing incidence and etiology, blood supply, clinical presentation, diagnostic imaging, classification, and treatment.