Table 2.
Incidence and prevalence of risk factors in infected cases and noninfected control subjects in hip hemiarthroplasties
| Suspected risk factor for infection | Hemiarthroplasties | ||
|---|---|---|---|
| Infected cases (N = 23) | Noninfected control subjects (N = 100) | “p” Value | |
| Age (years) (mean ± SD) | 81 ± 7 | 84 ± 7 | 0.049 |
| Female/male | 22/1 | 77/23 | 0.042 |
| Previous surgery | 2 (9%) | 0 (0%) | 0.003 |
| Obesity | 2 (9%) | 1 (1%) | 0.031 |
| Diabetes | 6 (26%) | 18 (18%) | 0.378 |
| Rheumatoid arthritis | 1 (4%) | 1 (1%) | 0.252 |
| Liver disease | 1 (4%) | 5 (5%) | 0.896 |
| Corticoid therapy | 3 (13%) | 2 (2%) | 0.016 |
| Immunosuppressive therapy | 1 (4%) | 0 (0%) | 0.036 |
| Tuberculosis | 0 (0%) | 4 (4%) | 0.329 |
| Thalassemia | 1 (4%) | 3 (3%) | 0.630 |
| Preoperative leukocyte count (cells/ml) (mean ± SD) | 10,202 ± 3966 | 9748 ± 3062 | 0.546 |
| Length of surgery (minutes) | 90 ± 36 | 69 ± 18 | 0.000 |
| Inadequate AB prophylaxis | 3 (12%) | 1 (1%) | 0.016 |
| Haematocrit loss (% of total blood volume occupied by red blood cells) (mean ± SD) | 10.7 ± 4.4 | 10.0 ± 3.9 | 0.456 |
| Blood transfusion | 15 (68%) | 57 (57%) | 0.334 |
| Volume transfused (ml) (mean ± SD) | 865 ± 695 | 615 ± 570 | 0.079 |
| Intraoperative periprosthetic fractures | 1 (4%) | 3 (3%) | 0.742 |
| Persistent secretion | 17 (85%) | 6 (6%) | 0.000 |
| Hematoma | 6 (27%) | 1 (1%) | 0.000 |
| Dislocation | 6 (27%) | 3 (3%) | 0.000 |
| Reoperation | 1 (4%) | 1 (1%) | 0.252 |
| Cutaneous infection | 7 (30%) | 8 (8%) | 0.003 |
| Urinary infection | 9 (39%) | 17 (17%) | 0.019 |
| Abdominal infection | 4 (17%) | 3 (3%) | 0.007 |
| Pneumonia | 4 (17%) | 9 (9%) | 0.238 |
| Oral/dental infection | 0 (0%) | 1 (1%) | 0.630 |
SD = standard deviation.