A 55-year-old man presents with severe low back pain that ha…
A 55-year-old man presents with severe low back pain that has progressively worsened over the past two weeks. He reports constant pain that is unrelieved by rest and is worse at night. The patient has a recent history of a urinary tract infection and has experienced intermittent fevers and chills. Physical examination reveals significant tenderness to palpation over the lumbar spinous processes, but no radicular symptoms. Which finding most strongly supports the suspicion of a lumbar spine infection?