Table 2.
Outcomes compared between cemented versus AMA groups before and after PS matching.
| Outcomes before and after PS matching | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Before PS matching | After PS matching | Relative risk (95% CI) | NNT (95% CI) | |||||||||
| Cemented | AMA | p value | Cemented | AMA | p value | |||||||
| 146 cases | 304 cases | 128 cases | 128 cases | |||||||||
| Mean | n or (range, SD) | Mean | n or (range, SD) | Mean | n or (range, SD) | Mean | n or (range, SD) | |||||
| Duration of Surgery | 69.1 mins | (21–171, 23.6) | 53.7 mins | (20–135, 21.4) | 0.000 | 67.7 mins | (21–139, 22.5) | 56.1 mins | (21–135, 21.6) | 0.000 | ||
| General anaesthesia | 26.7% | 36 | 17.4% | 53 | 0.022 | 25.8% | 33 | 18.0% | 23 | 0.131 | ||
| Received blood transfusion | 35.6% | 52 | 38.2% | 116 | 0.602 | 35.9% | 46 | 32.0% | 41 | 0.510 | ||
| Died at 1 month | 2.1% | 3 | 3% | 9 | 0.577 | 2.3% | 3 | 0.0% | 0 | 0.082 | ||
| Died at 3 months | 4.8% | 7 | 7.9% | 24 | 0.225 | 4.7% | 6 | 3.1% | 4 | 0.521 | ||
| Died at 6 months | 8.2% | 12 | 11.8% | 36 | 0.244 | 8.6% | 11 | 8.6% | 11 | 1.000 | ||
| Died at 12 months | 12.3% | 18 | 19.1% | 58 | 0.074 | 12.5% | 16 | 15.6% | 20 | 0.474 | ||
| Total length of stay (mean, SD) | 29.3 days | (2–292, 26.9) | 29.6 days | (5–130, 16.8) | 0.880 | 29.8 days | (2–292, 28.4) | 31.8 days | (12–130, 18.0) | 0.508 | ||
|
| ||||||||||||
| Fulfill clinical analysis criteria | 88.4% | 129 | 86.5% | 263 | 0.585 | 88.3% | 113 | 91.4% | 117 | 0.410 | ||
|
| ||||||||||||
| post-op functional walker | 83.7% | 108 | 74.9% | 197 | 0.053 | 81.4% | 92 | 80.3% | 94 | 0.868 | ||
| post-op recreational walker | 21.7% | 28 | 5.3% | 14 | 0.000 | 15.9% | 18 | 9.4% | 11 | 0.165 | ||
| Unable to maintain walking function | 42.6% | 55 | 44.9% | 118 | 0.746 | 45.1% | 51 | 49.6% | 58 | 0.512 | ||
| post-op thigh pain | 6.2% | 8 | 22.4% | 59 | 0.000 | 7.1% | 8 | 24.8% | 29 | 0.000 | 3.50 (1.67–7.33) | 5.6 (3.7–11.8) |
|
| ||||||||||||
| Fulfill complication analysis criteria | 80.1 | 117 | 81.3 | 247 | 0.779 | 79.7% | 102 | 82.0% | 105 | 0.635 | ||
|
| ||||||||||||
| Cracks from attempted AMA | 4.3% | 5 | 4.9% | 5 | ||||||||
| Complications | 4.3% | 5 | 21.9% | 54 | 0.000 | 4.9% | 5 | 21.9% | 23 | 0.000 | 4.47 (1.77–11.30) | 5.9 (3.8–12.5) |
| Loosening | 2.6% | 3 | 23.1% | 57 | 0.000 | 2.9% | 3 | 24.8% | 26 | 0.000 | 8.42 (2.63–26.95) | 4.6 (3.2–7.8) |
| Loosening before 1 year | 2.6% | 3 | 21.9% | 54 | 0.000 | 2.9% | 3 | 22.9% | 24 | 0.000 | 7.77 (2.41–25.01) | 5.0 (3.5–9.0) |
| Revision surgeries | 3.4% | 4 | 6.9% | 17 | 0.233 | 3.9% | 4 | 7.6% | 8 | 0.374 | ||
| Intraoperative crack | 0.9% | 1 | 5.3% | 13 | 0.043 | 1.0% | 1 | 6.7% | 7 | 0.065 | ||
| Dislocations | 0.9% | 1 | 3.2% | 8 | 0.282 | 1.0% | 1 | 3.8% | 4 | 0.369 | ||
| Infections | 0.9% | 1 | 2.8% | 7 | 0.445 | 1.0% | 1 | 2.9% | 3 | 0.621 | ||
| Traumatic periprosthetic fractures | 0.9% | 1 | 1.2% | 3 | 1.000 | 1.0% | 1 | 0.0% | 0 | 0.493 | ||
NNT: number needed to treat.
Double sided Fisher's exact test for dichotomous variables.
Two-tailed Independent sampled t-test for continuous variables.