Table 2.
Characteristics during and after surgery for patients according to treatment*,†
| Variable | Cemented | Uncemented | Mean difference or relative risk (95% CI) | p Value |
|---|---|---|---|---|
| Perioperative details | ||||
| Time from admission to surgery (hours) | 21.9 (18.3) (n = 112) | 19.1 (14.4) (n = 108) | 2.8‡ (−1.6–7.1) | 0.22 |
| Duration of surgery (minutes) | 82.6 (19.8) (n = 112) | 70.2 (19.3) (n = 108) | 12.4‡ (7.2–17.6) | < 0.001 |
| Length of surgical incision (cm) | 14.1 (2.72) (n = 100) | 13.6 (2.60) (n = 97) | 0.47‡ (−0.28–1.22) | 0.22 |
| Main surgeons > 3 years’ experience with procedure | 72 (64%) (n = 112) | 60 (56%) (n = 108) | 0.86 (0.70–1.08) | 0.22 |
| Intraoperative blood loss (mL) | 390 (183.7) (n = 111) | 300 (171.9) (n = 108) | 89‡ (42–137) | < 0.001 |
| Postoperative drainage blood loss (mL) | 220 (147.3) (n = 105) | 233 (157.3) (n = 101) | 12.5‡ (−54.4–29.3) | 0.56 |
| Total blood loss (mL) | 598 (278) (n = 111) | 521 (265) (n = 107) | 77‡ (4.6–149.6) | 0.037 |
| Hospital stay | ||||
| Received blood transfusion while admitted | 47 (42%) (n = 111) | 36 (34%) (n = 106) | 0.80 (0.57–1.13) | 0.21 |
| Hospital stay (days) | 7.8 (4.11) (n = 109) | 8.4 (9.02) (n = 106) | 0.62‡ (−2.49–1.26) | 0.52 |
| Mortality§ | ||||
| Within 7 days | 3 (3%) (n = 108) | 4 (4%) (n = 105) | 1.37 (0.31–5.98) | 0.72 |
| Within 30 days | 4 (4%) (n = 108) | 8 (8%) (n = 105) | 2.06 (0.64–6.63) | 0.25 |
| Within 90 days | 13 (12%) (n = 108) | 15 (14%) (n = 105) | 1.19 (0.59–2.37) | 0.69 |
| Within 12 months | 20 (19%) (n = 108) | 30 (29%) (n = 105) | 1.54 (0.94–2.54) | 0.11 |
| Within 24 months | 32 (30%) (n = 108) | 36 (34%) (n = 105) | 1.16 (0.78–1.72) | 0.56 |
*Number (n) varies because some information was missing for some patients; †values are expressed as mean, with standard deviation in parentheses, or as number of hips, with percentage in parentheses; ‡mean difference; §seven patients were included with both hips and are included only with their first hip in the mortality analyses; only one of these patients died during the study period (both hips in the uncemented group) and would not have influenced the significance of the analyses; 95% CI = 95% confidence interval.