Table 5.
Association of risk factors with knee infection, revision and death 1 year after total knee arthroplasty
| Risk factor | OR (95% CI) | ||
|---|---|---|---|
| Infection | Revision | Death | |
| Year of surgery | 1.0 (1.0 to 1.0) | 1.0 (1.0 to 1.0) | 1.0 (0.9 to 1.0) |
| Blood transfusion | 1.6 (1.1 to 2.4) | 1.5 (1.0 to 2.5) | 1.1 (0.7 to 1.8) |
| Diabetes with complications | 1.0 (0.8 to 1.4) | 1.1 (0.8 to 1.5) | 0.8 (0.5 to 1.3) |
| Diabetes without complications | 1.0 (0.5 to 1.8) | 1.0 (0.5 to 2.0) | 1.1 (0.5 to 2.2) |
| Hypertension | 1.3 (1.0 to 1.7) | 1.1 (0.8 to 1.4) | 1.3 (0.9 to 1.9) |
| Myocardial infarction | 1.4 (0.5 to 4.0) | 1.0 (0.2 to 4.3) | 6.8 (3.3 to 14.0) |
| Congestive heart failure | 1.2 (0.6 to 2.4) | 1.9 (0.9 to 3.8) | 2.9 (1.7 to 5.1) |
| Ischemic heart disease | 0.9 (0.6 to 1.3) | 0.7 (0.5 to 1.2) | 0.9 (0.5 to 1.4) |
| Osteoporosis | 1.1 (0.7 to 1.7) | 1.1 (0.7 to 1.8) | 0.8 (0.5 to 1.5) |
| Peripheral vascular disease | 1.1 (0.5 to 2.4) | 1.7 (0.8 to 3.7) | 1.5 (0.7 to 3.3) |
| Cerebrovascular accident | 1.6 (0.9 to 3.0) | 1.3 (0.6 to 2.8) | 2.2 (1.2 to 4.2) |
| Dementia | 0.7 (0.1 to 4.9) | 0* | 0.5 (0.1 to 4.1) |
| Chronic obstructive pulmonary disease | 1.3 (1.0 to 1.8) | 0.9 (0.6 to 1.3) | 1.3 (0.9 to 2.0) |
| Rheumatologic disease | 1.3 (0.9 to 2.1) | 0.9 (0.5 to 1.6) | 2.0 (1.1 to 3.4) |
| Peptic ulcer | 1.2 (0.5 to 2.8) | 0.6 (0.1 to 2.3) | 1.5 (0.6 to 3.6) |
| Mild liver disease | 4.0 (1.8 to 8.5) | 2.0 (0.7 to 5.8) | 5.5 (2.2 to 13.8) |
| Paraparesis/hemiparesis | 1.9 (0.4 to 8.3) | 1.1 (0.1 to 8.9) | 0.6 (0.1 to 5.9) |
| Renal disease | 1.1 (0.5 to 2.3) | 1.3 (0.6 to 2.7) | 2.5 (1.3 to 4.8) |
| Cancer | 1.0 (0.6 to 1.6) | 1.1 (0.7 to 1.8) | 1.7 (1.0 to 2.7) |
| Moderate to severe liver disease | 1.0 (0.2 to 5.1) | 2.1 (0.4 to 11.4) | 1.5 (0.2 to 8.9) |
| Metastatic disease | 2.0 (0.7 to 5.8) | 2.1 (0.7 to 6.4) | 4.5 (1.8 to 11.0) |
| Median household income | 1.0 (1.0 to 1.0) | 1.0 (1.0 to 1.0) | 1.0 (1.0 to 1.0) |
| Age 60–69 yr | 0.8 (0.6 to 1.1) | 0.8 (0.6 to 1.0) | 1.7 (0.9 to 3.2) |
| Age 70–79 yr | 0.6 (0.4 to 0.8) | 0.4 (0.3 to 0.6) | 2.4 (1.3 to 4.6) |
| Age ≥ 80 yr | 0.6 (0.3 to 0.9) | 0.3 (0.1 to 0.5) | 6.6 (3.4 to 12.9) |
| Female sex | 0.7 (0.6 to 0.9) | 0.7 (0.5 to 0.9) | 0.8 (0.6 to 1.1) |
| Centre B | 0.8 (0.5 to 1.2) | 0.9 (0.5 to 1.4) | 0.8 (0.4 to 1.5) |
| Centre C | 1.0 (0.7 to 1.3) | 1.1 (0.8 to 1.6) | 1.1 (0.7 to 1.8) |
| Centre D | 0.3 (0.2 to 0.6) | 0.8 (0.5 to 1.3) | 2.0 (1.2 to 3.3) |
| Centre E | 0.9 (0.7 to 1.3) | 0.9 (0.6 to 1.3) | 0.9 (0.6 to 1.5) |
CI = confidence interval; OR = odds ratio.
*
The number of incidents was insufficient to calculate the odds ratio of corresponding complications.