Western blot analysis showed that ONFH patients in the traumatic ONFH group (P = 0.045), steroid-induced ONFH group (P < 0.001), and alcohol-induced ONFH group (P < 0.001) had significantly higher PPARγ protein expression than those in the femoral neck fracture group (Figures 2(a) and 2(b)). This evidence concerns the gene PPARG and femoral neck fracture.