Table 2: Sensitivity and specificity of synovial fluid culture and synovial leukocyte count at interstage aspiration.

ThresholdSensitivitySpecificityPositive Predictive ValueNegative Predictive Value

culture positive0.0000.9890.0000.978
culture positive0.0341.0001.0000.541
4450 cells/μl0.500.8650.1670.970
3250 cells/μl0.3570.9290.8330.591

SFC: synovial fluid culture; SWBCC: synovial white blood cell count.