Table 5 Overview of the microorganisms detected in intraoperative biopsies (a minimum of three separate biopsies were performed) of all patients and the two groups defined according to the time-to-reimplantation cutoff of 94 days

Microorganism at first stage

 Patients with knee PJI, n

163

104

59

 CONS, n (%)

51 (31%)

33 (32%)

18 (31%)

 MRSE, n (%)

5 (3%)

2 (2%)

3 (5%)

 MSSA, n (%)

16 (10%)

11 (11%)

5 (8%)

 Gram-negative species, n (%)

9 (6%)

7 (7%)

2 (3%)

 Streptococcus species, n (%)

5 (3%)

1 (1%)

4 (7%)

 Enterococcus species, n (%)

5 (3%)

3 (3%)

2 (3%)

 Polymicrobial, n (%)

7 (4%)

4 (4%)

3 (5%)

 Other, n (%)

10 (6%)

9 (9%)

1 (2%)

 Culture negative, n (%)

55 (34%)

34 (33%)

21 (36%)

Microorganism at revision for reinfection

 Patients with a reinfection after two-stage exchange, n

37

16

21

 CONS, n (%)

5 (14%)

1 (5%)

4 (25%)

 MRSE, n (%)

4 (11%)

4 (20%)

0 (0%)

 MSSA, n (%)

4 (11%)

2 (10%)

2 (13%)

 MRSA, n (%)

1 (3%)

0 (0%)

1 (6%)

 Streptococcus species, n (%)

1 (3%)

0 (0%)

1 (6%)

 Enterobacter species, n (%)

1 (3%)

0 (0%)

1 (6%)

 Candida species, n (%)

1 (3%)

0 (0%)

1 (6%)

 Polymicrobial, n (%)

9 (24%)

3 (15%)

6 (38%)

 Other, n (%)

2 (5%)

0 (0%)

2 (13%)

 Culture negative, n (%)

9 (24%)

6 (30%)

3 (19%)