TABLE 3.
Comparison of diagnostic effectiveness for PJI between sonicate fluid cultures with Bactec bottles and synovial fluid cultures with Bactec bottles
| Culture type | PJI (no. [%]) (n = 50) | AF (no. [%]) (n = 60) | Sensitivity (% [95% CI])a | Specificity (% [95% CI]) | PPV (% [95% CI]) | NPV (% [95% CI]) |
|---|---|---|---|---|---|---|
| Sonicate fluid | 44 (88) | 8 (13) | 88 (76–95) | 87 (75–94) | 85 (72–93) | 90 (79–96) |
| Synovial fluid | 32 (64) | 1 (2) | 64 (49–77) | 98 (91–100) | 97 (84–100) | 77 (66–86) |
| P | <0.001 | 0.016 | 0.009 | 0.032 | 0.144 | 0.068 |
a
CI, confidence interval; PPV, positive predictive value; NPV, negative predictive value.