Table 1.
Demographic data on patients in the unilateral and staged bilateral TKA groups
| Variable | Unilateral TKA group (n = 53) |
Bilateral TKA group (n = 100) |
P value |
|---|---|---|---|
| Age (years) | 71.3(range, 55–84; SD, 6.3) | 71.5 (range, 53–84; SD, 6.4) | 0.891 |
| Proportion of female patients | 45 (84.9)* | 85 (85)* | 0.988 |
| BMI (kg/m2) | 26.9 (range, 20.9–44.8; SD, 4.1) | 27.2 (range, 18.6–36; SD, 3.7) | 0.684 |
| Proportion undergoing general anesthesia | 45 (84.9)* | 95 (95)* | 0.063 |
| Operation time (min) | 95.4 (range, 66–175; SD, 19) | 91.2 (range, 43–140; SD, 16.2) | 0.159 |
| Length of hospital stay (days) | 13.9 (range, 8–23; SD 2.7) | 20.7 (range, 11–32; SD 3.9) | < 0.001 |
| Number of comorbiditiesa | 1.4 (range, 0–5; SD, 1.0) | 1.3 (range, 0–4; SD, 1.1) | 0.331 |
Data are presented as means or numbers of patients. Ranges, standard deviations, and proportions* are shown in parentheses. Abbreviations = TKA Total knee arthroplasty, BMI Body mass index, SD standard deviation
aComorbidities include previous venous thromboembolism, varicose vein and previous operation on the leg, which are the major risk factors for deep vein thrombosis