TABLE 3.
Comparison between sonication fluid culture and periprosthetic tissue culturea
| Culture type | Sensitivityb |
Specificityc |
Positive predictive value |
Negative 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 fluid | 90.4 (113/125) | 83.9–94.4 | 90.9 (50/55) | 80.4–96 | 95.8 (113/118) | 90.6–98.2 | 80.6 (50/62) | 68.2–87.7 |
| Tissue | 56.8 (71/125) | 47.6–65.3 | 96.4 (53/55) | 87.7–99.6 | 97.3 (71/73) | 90.7–99.2 | 49.7 (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).