Which feature is most characteristic of chronic osteomyelitis?

Which feature is most characteristic of chronic osteomyelitis?

• A. Acute fever with systemic toxicity
• B. Draining sinus and sequestrum formation
• C. Rapid cross-bone remodeling
• D. No radiographic changes

Answer: (B)

Chronic osteomyelitis is best recognized by a draining sinus with sequestrum formation. The sequestrum is dead bone that becomes separated from healthy bone and is often surrounded by reactive new bone (involucrum). This combination reflects a long-standing infection in which blood supply is compromised and bacteria persist in necrotic tissue, driving chronic drainage through a sinus tract to the skin. Imaging typically shows the sequestrum and involucrum, which are classic signs of chronic disease. In contrast, acute osteomyelitis more commonly presents with fever and systemic toxicity, and rapid bone remodeling or absence of radiographic changes are not defining features of the chronic state.