This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Orthopaedics
[{'content': 'MC comp. of # talus is - \nSelect and explain. \nA. Avascular necrosis, B. Nonunion, C. Osteoarthritis of ankle joint, D. Osteoarthritis of subtalar joint', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Most of the guides have given AVN as the most common complications of talus fracture. They are wrong.\nA most common complication of talus fracture is subtalar joint arthritis. Read following statements : -\n"Subtalar and ankle arthritis is a common complication of talar neck fractures, with an incidence ranging from 47 to 97%. Subtalar arthritis has been reported in up to 50% of cases and ankle arthritis in 33% of cases".\n"The overall incidence of AVN ranges between 19 and 69%".\n"Delayed union, nonunion and malunion of the talus are relatively rare. Delayed union is reported in 13% and non-union is noted in 4%".', 'role': 'assistant'}]