Table 5.
Predictive factors for failure with corresponding hazard ratios
| Category | Parameter | Hazard ratio† (95% confidence interval) | p value | Adjusted hazard ratio‡ (95% confidence interval) | p value |
|---|---|---|---|---|---|
| Demographic factors | Age > 40 years | 5.6 (4.6–6.7) | < 0.001 | 11.8 (10.6–13.0) | < 0.001 |
| Weight > 90 kg | 3.4 (2.2–4.6) | 0.05 | |||
| BMI > 25 kg/m2 | 4.4 (3.0–5.7) | 0.03 | |||
| Preoperative radiographic factors | Anterior femoral coverage < 15% | 4.9 (3.6–6.3) | 0.02 | ||
| Osteoarthritis ≥ 1 | 3.9 (2.9–4.9) | 0.001 | |||
| Postoperative factors related to surgical accuracy | LCE angle < 22°* | 5.7 (4.6–7.0) | 0.004 | ||
| AI > 14°* [46] | 6.6 (5.4–7.8) | 0.001 | 6.1 (5.0–7.2) | 0.001 | |
| Extrusion index > 28%* [28] | 11.5 (10.0–13.0) | 0.002 | |||
| Total femoral coverage < 72%* | 4.9 (3.5–6.1) | 0.02 | 6.1 (4.9–7.4) | 0.004 | |
| Anterior femoral coverage < 13%* | 3.6 (2.5–4.7) | 0.02 | |||
| Posterior femoral coverage < 34%* | 3.8 (2.6–5.0) | 0.03 |
* Undercoverage defined by Tannast et al. [40]; †univariate analysis; ‡multivariate analysis; BMI = body mass index; LCE = lateral center-edge angle; AI = acetabular index.