A patient presents with a recent history of respiratory or urinary tract infection, antalgia, fever, and pain that disrupts sleep. This presentation most likely suggests which condition?

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Fever with spinal pain after a recent infection points to an infectious process in the spine, most classically vertebral osteomyelitis. When bacteria spread hematogenously from a urinary or respiratory tract infection, they can seed the vertebral bodies, causing localized pain, tenderness, and antalgia as the spine is moved. The fever and pain that wakes the patient at night are common because the inflammatory process is active, and systemic signs often accompany it.

This pattern distinguishes it from degenerative disc disease and disc herniation, which tend to be mechanical in nature and lack fever or recent infection. Ankylosing spondylitis causes inflammatory back pain and stiffness but usually in younger individuals and without a recent infectious history or fever.