Table 2.
Multivariable model analysis for hip survival after treated with bone grafting (FVFG) on ONFH
| Variables | Fragile Cox modela |
||
|---|---|---|---|
| β | Adjusted HR (95% CI) | Risk score | |
| Surgical age | |||
| ≤ 35 years | 1.0 (Ref) | 0 | |
| 36 – 50 years | 0.436b | 1.546 (1.105 – 2.163) | 1 |
| > 50 years | 0.927 | 2.526 (1.547 – 4.125) | 2 |
| Status of collapse | |||
| No collapsed | 1.0 (Ref) | 0 | |
| Collapsed < 2 mm | 0.459 | 1.583 (1.000 – 2.531) | 1 |
| Collapsed ≥ 2 mm | 0.769 | 2.158 (1.288 – 3.614) | 2 |
| Degeneration (moderate-to-severe) | 0.802 | 2.229 (1.160 – 4.285) | 2 |
| Size (> 30%) | 0.592 | 1.808 (1.201 – 2.723) | 1.5 |
| Hip involvement (bilateral ONFH) | 0.671 | 1.956 (1.400 – 2.733) | 1.5 |
| Physical tensity (moderate-to-high) | 0.601 | 1.823 (1.338 – 2.484) | 1.5 |
| Pre-HHS (< 70 points) | 0.589 | 1.802 (1.318 – 2.464) | 1.5 |
| Peri-smoking | 0.865 | 2.375 (1.255 – 4.496) | 2 |
a
From completed datasets of 1,179 hips.
b
Using the minimum β value as the scoring reference, and other values divided by the minimum β value to form a new risk score (based on the rounding principle).