Table 6 Linear regression analyses for associations of variables with postoperative modified Harris Hip Score
| Â | Univariable | Multivariable | ||||||
|---|---|---|---|---|---|---|---|---|
βa | (95% CI) | p-value | βa | (95% CI) | p-value | |||
Age | -0.1 | (-0.2 | – -0.1) |  < 0.001 | -0.1 | (-0.2 | – -0.1) |  < 0.001 |
Body mass index (BMI) | -0.5 | (-0.7 | – -0.4) |  < 0.001 | -0.5 | (-0.7 | – -0.4) |  < 0.001 |
Sex: male | 3.0 | (1.5 | – 4.6) |  < 0.001 | 3.0 | (1.5 | – 4.6) |  < 0.001 |
Charnley comorbidity classification | ||||||||
 A | REF |  |  |  | REF |  |  |  |
 B | -0.5 | (-2.2 | – 1.2) | 0.585 | -0.4 | (-2.1 | –1.3) | 0.649 |
 C | -2.0 | (-4.7 | – 0.7) | 0.145 | -1.4 | (-4.1 | –1.3) | 0.308 |
Surgical indication | ||||||||
 Avascular necrosis | -0.4 | (-4.2 | – 3.3) | 0.826 | -0.4 | (-4.2 | – 3.3) | 0.826 |
 Primary OA | REF |  |  |  | REF |  |  |  |
 Rapidly destructive OA | -3.7 | (-7.5 | – 0.1) | 0.056 | -3.7 | (-7.5 | – 0.1) | 0.056 |
Rheumatoid arthritisa | ||||||||
 Secondary OA due to acetabular protrusio | -1.8 | (-6.9 | – 3.3) | 0.484 | -1.8 | (-6.9 | – 3.3) | 0.484 |
 Secondary OA due to hip dysplasia | -1.9 | (-5.3 | – 1.6) | 0.287 | -1.9 | (-5.3 | – 1.6) | 0.287 |
Stem implanted: shortened | 2.1 | (0.5 | – 3.6) | 0.010 | 2.1 | (0.5 | – 3.6) | 0.010 |
Preoperative canal calcar ratio (CCR) | -6.4 | (-15.0 | – 2.3) | 0.148 | -3.5 | (-15.6 | –8.7) | 0.574 |
Preoperative cortical thickness index (CTI) | 7.8 | (-1.9 | – 17.6) | 0.114 | 4.5 | (-9.6 | –18.7) | 0.529 |
Preoperative Dorr classification | ||||||||
 A | REF |  |  |  | REF |  |  |  |
 B | -0.8 | (-2.5 | – 1.0) | 0.382 | -0.7 | (-2.5 | –1.2) | 0.463 |
 C | -0.3 | (-3.1 | – 2.4) | 0.808 | -0.3 | (-3.2 | –2.7) | 0.867 |
Preoperative femoral offset | 0.1 | (0.0 | – 0.2) | 0.022 | 0.1 | (0.0 | – 0.2) | 0.022 |
Preoperative limb length discrepancy (LLD) | 0.1 | (-0.1 | – 0.2) | 0.438 | 0.1 | (-0.1 | – 0.2) | 0.438 |