Table 2.
Univariate analysis of all variables investigated as predictors of failure in two-stage reimplantation
| Variables | All patients N = 52 (100%) | Success N = 47 (90.4%) | Failure N = 5 (9.6%) | p |
|---|---|---|---|---|
| Spacer type | ||||
| Premade Vancomycin-Gentamicin with stem | 26 (50) | 24 (51.1) | 2 (40) | 0.829 |
| Premade Vancomycin-Gentamicin without stem | 19 (36.5) | 16 (34) | 3 (60) | |
| Premade Gentamicin | 1 (1.9) | 1 (2.1) | 0 | |
| Self-made static spacer | 6 (11.5) | 6 (12.8) | 0 | |
| PJI-causing microorganisms | ||||
| Gram positive | 27 (51.9) | 24 (51.1) | 3 (60) | 0.402 |
| Gram negative | 11 (21.2) | 11 (23.4) | 0 | |
| Anaerobe | 10 (19.2) | 10 (21.3) | 0 | |
| Fungus | 0 | 0 | 0 | |
| Polymicrobial | 8 (15.4) | 8 (17) | 0 | 1 |
| First stage approach | ||||
| EMP | 27 (51.9) | 24 (51.1) | 3 (60) | 1 |
| TTO | 25 (48.1) | 23 (48.9) | 2 (40) | |
| Second stage approach | ||||
| EMP | 17 (32.7) | 13 (27.7) | 4 (80) | 0.034 |
| TTO | 35 (67.3) | 34 (72.3) | 1 (20) | |
| Type of failure | ||||
| Infection relapse (same bacteria) | 1 (1.9) | – | 1 (20) | – |
| Superinfection (different bacteria) | 4 (7.7) | – | 4 (80) | – |
| Kept the prosthesis at the end of the follow up | 48 (92.3) | 47 (100) | 1 (20) | < 0.001 |
EMP extensile medial parapatellar, TTO tibial tubercle osteotomy
Bold value indicates statistically significant p-values < 0.05