Table 4.
Predictive factors for failure with corresponding hazard ratios
| Category | Parameter | Hazard ratio† (95% confidence interval) | p value | Adjusted hazard ratioǂ (95% confidence interval) | p value |
|---|---|---|---|---|---|
| Demographic factors | Age > 40 years | 4.9 (4.0–5.8) | < 0.001 | 5.9 (4.8–7.1) | 0.002 |
| Weight > 100 kg | 4.6 (3.3–5.9) | 0.019 | |||
| Body mass index > 30 kg/m2 | 5.1 (3.6–6.6) | 0.033 | 5.5 (3.9–7.2) | 0.041 | |
| Preoperative radiographic factors | Anterior femoral coverage < 15%* | 4.3 (3.2–5.4) | < 0.001 | ||
| Osteoarthritis ≥ Tönnis Grade 1 | 6.2 (5.2–7.2) | < 0.001 | |||
| Postoperative factors related to surgical accuracy | LCEA < 22° or > 32°* | 5.4 (4.3–6.5) | 0.003 | 5.4 (4.2–6.6) | 0.006 |
| AI < 3° or > 13°* | 5.3 (3.7–6.9) | 0.037 | |||
| Extrusion index < 18% or > 28%* | 5.6 (4.5–6.7) | 0.002 | |||
| Total femoral coverage < 72% or > 83%* | 3.1 (2.1–4.1) | 0.029 | |||
| Anterior femoral coverage < 15%* | 3.7 (2.4–4.9) | 0.038 | |||
| Posterior femoral coverage < 34%* | 3.4 (2.4–4.3) | 0.011 | 4.8 (3.7–5.9) | 0.006 |
* Under- or overcoverage defined by Tannast et al. [37]; †univariate analysis; ǂmultivariate analysis; LCEA = lateral center-edge angle; AI = acetabular index.