Table 1.
Intra-lineage pairwise single-nucleotide polymorphism Demographic and clinical characteristics of 62 consecutive patients with prosthetic joint infections caused by coagulase-negative staphylococci
| Characteristics | Total (%) |
|---|---|
| Median age (IQR), year | 68.6 (60.5 − 77.5) |
| No. of female patients | 28 (45) |
| Arthroplasty | |
| Hip | 38 (61) |
| Knee | 21 (34) |
| Other: elbow (n = 1), shoulder (n = 2) | 3 (5) |
| Reason for primary arthroplasty | |
| Osteoarthritis | 36 (60) |
| Fracture or trauma | 15 (32) |
| Rheumatoid arthritis | 11 (8) |
| IDSA PJI criteria | |
| Identical organism identified with two separate cultures | 62 (100) |
| Presence of sinus tract | 9 (15) |
| Visible purulence at implant site | 52 (84) |
| Surgical procedure | 62 (100) |
| Debridement and implant retention | 21 (34) |
| Revision (one-stage exchange) | 6 (10) |
| Resection (two-stage exchange or resection) | 35 (56) |
| Type of revision | |
| Primary | 35 (56) |
| Secondary | 27 (44) |
| Timing from prosthesis implanted to surgery (month) | |
| Early onset (< 3) | 37 (60) |
| Delayed onset (3 to 12) | 11 (18) |
| Late onset (> 12) | 14 (22) |
| Hospitalisation in previous year | |
| Yes | 36 (58) |
| No | 26 (42) |
| Failure of 2-year follow-up | |
| Yes | 15 (24) |
| No | 47 (76) |
IQR inter-quartile range, PJI prosthetic joint infection, IDSA Infectious Disease Society of America