Table 4 The hazard ratios for risk factors of conversion to THA for patients undergoing autologous or allogeneic fibular grafts

Surgical methods

Autologous fibular grafts

1.00 (reference)

1.00 (reference)

1.00 (reference)

1.00 (reference)

Allogeneic fibular grafts

1.624 (0.583–4.526)^†

1.77 (0.634–4.936)^†

1.897 (0.69–5.218)^†

1.716 (0.615–4.786)^†

Age

 ≤ 37 years

1.00 (reference)

 > 37 years

6.931 (1.996–24.074)*

BMI

 ≤ 24

1.00 (reference)

 > 24

2.249 (0.841–6.015)^†

ARCR stage

 Stage II

1.00 (reference)

 Stage III

0.823 (0.312–2.173)^†

Etiologies

 Glucocorticoid

0.881 (0.16–4.844)^†

 Alcoholic

2.817 (0.623–12.739)^†

 Traumatic

0.395 (0.052–3.003)^†

 Idiopathic

0.905 (0.119–6.891)^†