Journal
JOURNAL OF ARTHROPLASTY
Volume 23, Issue 1, Pages 65-68Publisher
CHURCHILL LIVINGSTONE INC MEDICAL PUBLISHERS
DOI: 10.1016/j.arth.2007.09.005
Keywords
periprosthetic infection; total knee arthroplasty; erythrocyte sedimentation rate; C-reactive protein
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The differential diagnosis of pain after total knee arthroplasty includes infection. Effective screening tools should have high sensitivity and are cost-effective. We evaluated 296 patients who underwent total knee revision at our institution. One hundred sixteen patients (39%) were classified as infected and 180 patients (61%) were considered noninfected. The mean erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP) of the infected patients were 85 mm/h and 110 mg/L, respectively. The mean ESR and CRP of the noninfected patients were 22 mm/h and 7 mg/L, respectively. Five patients (4%) in the infected group had both normal ESR and CRP. Infection was suspected in all 5 patients, and an organism was cultured in 4 of the 5 cases. Erythrocyte sedimentation rate and CRP, when used in combination, serve as a useful screening tool in patients with a painful total knee arthroplasty.
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