Table 3 Univariate and multivariate analysis to verify the correlation and predictive power for a higher risk of acetabular erosion after BHA

Age (year)

58.1 ± 2.4

47.9 ± 11.2

< 0.001

0.774 (0.687 to 0.871)

< 0.001

0.787 (0.631 to 0.981)

0.033

Gender (male/female)

22/47

29/16

0.024

2.408 (1.117 to 5.195)

0.025

0.851 (0.149 to 4.859)

0.856

BMI (kg/m²)

20.7 ± 1.3

24.0 ± 3.1

< 0.001

2.400 (1.684 to 3.421)

< 0.001

1.903 (1.331 to 2.722)

< 0.001

<18.5

4

1

18.-24.9

66

22

≥25

3

18

BMD (T-score)

-1.5 ± 0.5

-1.5 ± 1.4

0.781

1.070 (0.781 to 1.593)

0.741

Cause for BHA

 FNF

62

24

< 0.001

7.750 (2.919 to 20.579)

< 0.001

4.390 (0.161 to 11.558)

0.380

 ONFH

1

19

< 0.001

9.692 (6.327 to 39.290)

< 0.001

15.093 (0.237 to 96.508)

0.200

 PathF

4

0

0.152

 N/A

0.999

 ITF

2

2

0.647

1.558 (0.221 to 11.479)

0.663

 Underlying disease

 Diabetes

12

15

0.050

2.375 (0.987 to 5.717)

0.054

 Dislipidaemia

0

2

0.154

 N/A

0.999

 Hypertension

13

16

0.045

2.377 (1.007 to 5.607)

0.048

2.950 (0.676 to 12.870)

0.150

 CVA

0

1

0.395

 N/A

1.000

 Cardiac Dz

1

3

0.299

4.875 (0.489 to 48.235)

0.177

 Pulmonary Dz

0

4

0.022

 N/A

0.999

 Hepatobiliary Dz

0

2

0.154

 N/A

0.999

 Kidney Dz

2

1

1.000

1.313 (0.116 to 14.925)

0.826

 Cancer

3

2

1.000

1.023 (0.164 to 6.379)

0.980

 RA

0

3

0.059

 N/A

0.999

 Head size (mm)

46.0 ± 3.1

48.2 ± 3.1

< 0.001

1.258 (1.102 to 1.436)

0.001

1.153 (0.889 to 1.494)

0.282

 Postoperative LLD (mm)

0.5 ± 2.7

0.6 ± 1.5

0.656

0.914 (0.887 to 1.015)

0.798