Predictors of Septic Wrist: A Dual-Center 10-Year Review of Risk Factors.

Expeditious and accurate diagnosis of septic wrist arthritis is essential to prevent further cartilage damage, systemic infection, osteomyelitis, and loss of limb. There is limited literature on the incidence and clinical factors that are predictive of septic wrist arthritis. We aimed to investigate the incidence of septic wrist arthritis and identify risk factors and laboratory values associated with septic wrist arthritis. Data were collected on adult patients presenting with a painful, swollen wrist to two level 1 urban hospitals from 2004 to 2014. Demographics, comorbidities, and laboratory values of patients who had wrist aspiration were collected. There was an overall incidence of 0.4%. Increased synovial white blood cells (WBC), being febrile, positive blood cultures, and smoking were significantly associated with septic wrist arthritis on univariate analysis. Synovial WBC was also found to be significant on multivariate analysis. A synovial WBC of 87,750 cells/µL had an optimal sensitivity and specificity of 73% and 86%, respectively, for diagnosing septic wrist arthritis. Synovial WBC can be a useful diagnostic tool for septic wrist arthritis. In addition, positive blood cultures, being febrile, and smoking history can help predict septic wrist arthritis in patients with presenting with painful, swollen wrists.