TABLE 2.
Culture results of study subjects with PJI
| Patient group | Sample no. | Result for cultures froma:
|
|||||
|---|---|---|---|---|---|---|---|
| Synovial fluid | Periprosthetic tissue
|
Sonicate fluid
|
|||||
| Organism | Organism | No. positive/ no. taken | CFU/g tissueb | Organism | CFU/ml sonicatec | ||
| Subjects who received | 1 | ND | Corynebacterium sp. | 2/4 | 4 | Corynebacterium sp. | 250 |
| antimicrobial therapy | 2 | CNS | CNS | 1/3 | >200 | CNS | >2,000 |
| before surgery | 3 | CNS | CNS | 6/6 | 11 | CNS | >2,000 |
| 4 | ND | CNS | 3/3 | 2 | CNS | >2,000 | |
| 5 | ND | Corynebacterium sp. | 1/3 | 5 | Neg | 0 | |
| 6 | Neg | S. aureus | 1/3 | 38 | Neg | 0 | |
| 7 | Neg | Neg | 0/5 | 0 | Neg | 0 | |
| 8 | S. aureus | S. aureus | 3/3 | >200 | S. aureus | >2,000 | |
| 9 | Neg | CNS | 4/4 | 9 | CNS | 150 | |
| 10 | S. aureus | S. aureus | 1/3 | 36 | S. aureus | >2,000 | |
| 11 | ND | Neg | 0/4 | 0 | Neg | 0 | |
| 12 | ND | Neg | 0/3 | 0 | NF-GNB | 850 | |
| 13 | ND | Neg | 0/3 | 0 | Neg | 0 | |
| Subjects who did not receive antimicrobial therapy before surgery | 14 | CNS | CNS | 3/3 | 20 | CNS | >2,000 |
| 15 | VGS | Neg | 0/3 | 0 | VGS | >2,000 | |
| 16 | CNS | CNS | 3/4 | 2 | CNS | 750 | |
| 17 | S. aureus | S. aureus | 3/3 | >200 | S. aureus | >2,000 | |
| 18 | CNS | Neg | 0/2 | 0 | CNS | >2,000 | |
| 19 | CNS | CNS | 3/3 | ND | CNS | >2,000 | |
| 20 | CNS | CNS | 3/3 | 17 | CNS | >2,000 | |
| 21 | CNS | CNS | 3/3 | >200 | CNS | >2,000 | |
| 22 | S. aureus | S. aureus | 3/3 | >200 | S. aureus | 110 | |
| 23 | Neg | CNS | 1/3 | 2 | CNS | 16 | |
| 24 | ND | CNS | 3/4 | 50 | CNS | >2,000 | |
a
Abbreviations: Neg, negative; CNS, coagulase-negative Staphylococcus sp.; VGS, viridans group Streptococcus sp.; NF-GNB, nonfermenting gram-negative bacillus; ND, not done.
b
Mean CFU per gram of periprosthetic tissue.
c
Mean CFU per ml of sonicate fluid.