Clinical outcomes of two-stage revision for chronic periprosthetic joint infection of the knee: culture-negative versus culture-positive

Table 4 Clinical outcomes of the culture-negative group and the culture-positive group

	Culture-negative group (n = 57)	Culture-positive group (n = 79)	p value
Reoperation after first-stage surgery, n (%)	6 (10.5%)	20 (25.3%)	0.045
Failure to reimplant, n (%)	14 (24.6%)	25 (31.6%)	0.444
Duration from the first-stage to second-stage surgery, month	5.2 ± 4.2 (2–22)	5.9 ± 4.5 (2–24)	0.394
Reoperation^a after second-stage surgery, n (%)	5 (11.6%)	7 (13.0%)	1.0
Reinfection^b after second-stage surgery, n (%)	5 (13.9%)	6 (12.2%)	1.0
Mortality, n (%)	2 (3.5%)	3 (3.8%)	1.0
Failure rate^c, n (%)	19 (33.3%)	31 (39.2%)	0.589

Data are presented as means ± standard deviation (range) unless otherwise indicated. ^aComparison of the reoperation rate evaluated among the subjects who received the second-stage surgery (culture-negative group: 43 cases, culture-positive group: 54 cases); ^bComparison of the reoperation rate evaluated among the subjects who were followed up for more than 1 year after the second-stage surgery (culture-negative group: 36 cases, culture-positive group: 49 cases); ^cOne of the following conditions was defined as failure: failure to reimplant, infection-related or surgery-related death, or recurrence of periprosthetic joint infection after the reimplantation surgery

ISSN: 2234-2451