TABLE 3

Comparison between sonication fluid culture and periprosthetic tissue culturea

Culture typeSensitivitybSpecificitycPositive predictive valueNegative predictive value
% (no. detected/total no.)95% CI (%)% (no. detected/total no.)95% CI (%)% (no. detected/total no.)95% CI (%)% (no. detected/total no.)95% CI (%)
Sonication fluid90.4 (113/125)83.9–94.490.9 (50/55)80.4–9695.8 (113/118)90.6–98.280.6 (50/62)68.2–87.7
Tissue56.8 (71/125)47.6–65.396.4 (53/55)87.7–99.697.3 (71/73)90.7–99.249.7 (53/107)41.7–60.1
  • a Comparison is among all subjects of study (n =180).

  • b The sensitivities of different culture methods were compared by McNemar's test of paired proportions (P < 0.001).

  • c The specificity of different culture methods were compared by McNemar's test of paired proportions (P = 0.45).