Table 1 Overall demographic data
Characteristic | Culture-negative group | Culture-positive group | p value |
|---|---|---|---|
Number of knees | 57 | 79 | |
Sex, male:female, n | 14:43 | 16:63 | 0.676 |
Age, year | 72.4 ± 7.0 (59–88) | 71.1 ± 7.1 (56–86) | 0.375 |
Body mass index, kg/m2 | 25.2 ± 3.1 (20.4–32.6) | 25.9 ± 2.7 (19.6–32.4) | 0.175 |
Source of referral, internal/external, n | 15/42 | 35/44 | 0.047 |
ASA classification, 1/2/3/4, n | 4/34/18/1 | 6/47/26/0 | 0.845 |
Type of surgery Primary/revision, n | 53/4 | 70/9 | 0.557 |
Sinus tract, n | 7 (12.3%) | 19 (24.1%) | 0.121 |
Duration from the TKA and diagnosis of PJI, month | 36.0 ± 44.7 (2–240) | 38.8 ± 46.2 (2–216) | 0.829 |
Follow-up duration, month | 31.8 ± 22.9 (2–134) | 32.9 ± 22.9 (1–120) | 0.774 |
Prior use of antibiotics, n | 0.111 | ||
Yes | 41 (71.9%) | 43 (54.4%) | |
No | 9 (15.8%) | 22 (27.8%) | |
Unknown | 7 (12.3%) | 14 (17.7%) |