Table 1.
The demographic characteristics of PJI patients included in this study
| characteristic | Polymicrobial | Monomicrobial | P value |
|---|---|---|---|
| PJI n = 64 | PJI n = 158 | ||
| Age (years)* | 63.5 (38–74) | 66 (36–82) | 0.012 |
| Knees, n (%) | 24 (37.5%) | 94 (59.5%) | 0.003 |
| Male, n (%) | 27 (42.2%) | 70, (44.9%) | 0.773 |
| Body Mass Index*(Kg/m2) | 25.6 (18.4–33.3) | 25.3 (15.6–48.6) | 0.637 |
| Sinus tract, n (%) | 31 (48.4%) | 17 (10.8%) | < 0.001 |
| CRP * (mg/dL) | 1.26(0.3–5.6) | 3.37(0.07–20.9) | 0.385 |
| ESR * (mm/h) | 44(8–123) | 51 (4–111) | 0.489 |
| Previous revisions, n (%) | 30 (46.9%) | 43(27.2%) | 0.005 |
| PJI | 25(83.3%) | 31(72.1%) | |
| Aseptic loosening | 4(13.33%) | 2(4.6%) | |
| Dislocation | 0 | 1(2.3%) | |
| Periprosthetic fracture | 0 | 2(4.6%) | |
| Other reasons | 1(3.33%) | 7(16.3%) | |
| Acute PJI** | 9(14.1%) | 20(12.7%) | 0.779 |
| Synovial fluid polymorphonuclear neutrophils (%) * | 63(70–96) | 64(3–98) | 0.923 |
| Synovial fluid white blood-cell count (cells/mL) * | 10,600(260–66,400) | 15,440(300–102,580) | 0.907 |
* Values were given as medians with the range in the parentheses
** Acute PJI: the PJI occurred with first postoperative month