CRP and infection: Pseudarthrosis caused by low-virulence bacteria is often presumed to be aseptic because of its delayed presentation and often normal inflammatory markers (blood counts, erythrocyte sedimentation rate [ESR], C-reactive protein [CRP]).5Because surgical site infection (SSI) requires a different surgical strategy (i.e., thorough debridement) and immediate start of antibiotic preoperatively, it is crucial to identify SSI prior to revision surgery.6Magnetic resonance imaging (MRI) is considered the gold standard imaging method when spinal infection is suspected.