Which signs would prompt evaluation for spinal infection (osteomyelitis or discitis) in a patient with back pain?

Which signs would prompt evaluation for spinal infection (osteomyelitis or discitis) in a patient with back pain?

• A. Fever, localized spinal tenderness, recent bacteremia, IV drug use, elevated inflammatory markers.
• B. No fever, general malaise.
• C. Only back stiffness.
• D. Fever with systemic symptoms only.

Answer: (A)

Red flags for spinal infection show up when back pain is accompanied by fever and focal spinal tenderness. This combination points toward an infectious process in the vertebrae or intervertebral disc, especially when there are risk factors like recent bacteremia or IV drug use, which raise the likelihood of hematogenous spread to the spine. Elevated inflammatory markers such as ESR or CRP further support an infectious cause and help distinguish it from simple mechanical back pain. Without fever or without focal tenderness, back pain alone is much less specific for infection, and the scenario with fever plus systemic symptoms only, without localizing spinal signs, is also less likely to indicate a spinal infection. Together, fever, localized spinal tenderness, recent bacteremia or IV drug use, and elevated inflammatory markers are the signs that should prompt evaluation for osteomyelitis or discitis.