Table 1.
Patient demographic and baseline data of 167 episodes
| Variables | All episodes (n = 167) |
|---|---|
| Female sex | 99 (59) |
| Median age, years (IQR) | 73 (63–78) |
| Affected joint | |
| Hip | 76 (46) |
| Knee | 91 (54) |
| Type of arthroplasty | |
| Primary prosthesis | 73 (44) |
| Revision prosthesis | 94 (56) |
| Classification according to occurrence of the infection | |
| Early (< 3 months) | 22/164 (14) |
| Delayed (> 3–24 months) | 63/164 (38) |
| Late (> 24 months) | 79/164 (48) |
| Mean time interval between last surgery and preoperative arthrocentesis, months (range) | 45.8 (0.1–284.8) |
| Patients with antimicrobial treatment | 49 (29) |
| At time of preoperative arthrocentesis | 6 (4) |
| At time of surgery | 21 (13) |
| At time of arthrocentesis and surgery | 22 (13) |
| Type of surgery | |
| Retention of prosthesis | 40 (24) |
| One- or two-stage exchange of prosthesis | 119 (71) |
| Diagnostic biopsy | 8 (5) |