<prompt> A 60 year old man with history of long standing diabetes mellitus presents with painless, swollen right ankle joint. X-rays of the ankle show destroyed joint with large number of loose bodies. The most probable diagnosis is:Charcots jointCluttons jointOsteoarthritisRheumatoid arthritis  <response>: Ans. A. Charcots jointa. It is progressive destructive arthritis arising from loss of pain sensation and proprioceptionb. Joints lack normal reflex safeguard against abnormal stress injury.c. Causes- DM, Tabes dorsalis, Leprosy, syringomyelia, Myelomeningocele, Chronic alcoholism 