Most common cause of chronic osteomyelitis: (A) Staphylococcus aureus, (B) Streptococcus pyogenes, (C) Mycobacterium tuberculosis, (D) Staphylococcus epidermidis
Answer is A. Chronic osteomyelitis is nearly always a sequel to acute osteomyelitisOccasionally infection is subacute or chronic from the beginningAs with acute osteomyelitis, the most common causative organism is staphylococcus areus(Refer: Mohindra's Fundamentals of Ohopedics, 2nd edition, pg no. 283, 284)