Table 3.

Sonication fluid cultures compared with the presence of clinical signs of infection in revision arthroplasty surgery cases

	Total cohort (n = 252)	Early revision (n = 48)	Late revision (n = 204)
Sensitivity	0.47	0.42	0.50
95% CI	0.35–0.59	0.25–0.61	0.34–0.66
Specificity	0.99	1.0	0.99
95% CI	0.96–1.00	0.78–1.0	0.9–1.00
Positive predictive value	0.95	1.0	0.91
Negative predictive value	0.81	0.44	0.88
Positive likelihood ratio	41	a	41
Negative likelihood ratio	0.54	0.58	0.51

^aerror due to impossibility of calculation with reference to a specificity of 1.00.