Table 1 Clinical and microbiological characteristics of all study cases
PJI1 (n = 40) | AF2 (n = 40) | |
|---|---|---|
Median patient age, yr (range) | 75 (46–89) | 72 (50–93) |
No. (%) of females | 18 (45) | 24 (57) |
Site of arthroplasty (no. [%]) | ||
Hip | 20 (50) | 20 (50) |
Knee | 20 (50) | 20 (50) |
Type of surgery (no. [%]) | ||
Explantation of the entire joint prosthesis | 25 (62) | 19 (47) |
Explantation of prosthesis components (femoral, acetabular, tibial, inlay) | 14 (35) | 18 (45) |
Debridement and prosthesis retention | 1 (3) | 3 (8) |
Patients with major diagnostic criteria for PJI* (no./total no. [%]) | ||
≥ 2 positive cultures | 32/35 (91) | 0 |
≥ 2 positive cultures + Presence of sinus tract | 2/35 (6) | 0 |
Negative culture + Presence of sinus tract | 1/35 (3) | 0 |
Average number of positive samples per patient/ Average total number of samples per patient | 3.5/4.5 | 0/4.5 |
Patients with negative major criteria and minor pre- and intraoperative scoring based diagnostic criteria for PJI* (no./total no. [%]) | ||
Score ≥ 6 (infected) | 5/5 (100) | 0 |
Score 4–5 (inconclusive) | 0 | 0 |
Score ≤ 3 (not infected) | 0 | 40 |