Usefulness of CRP and ESR in predicting septic joints.

Objective: To determine whether erythrocyte sedimentation rate (ESR), C-reactive protein (CRP), or a combination of both was better in diagnosing a septic joint.

Methods: A retrospective chart review was done in all patients who had serum assays for ESR or CRP as well as joint fluid analysis over a two-year period. Based on lab and operative findings, patients (cohorts) were categorized as having normal, inflammatory, or septic joints.