Fig. 1From: Attenuated serum vasoactive intestinal peptide concentrations are correlated with disease severity of non-traumatic osteonecrosis of femoral headA Comparison of serum VIP levels between non-traumatic ONFH and healthy control. B Comparison of serum VIP levels among steroid-induced group, alcohol-induced group, and idiopathic group. C Comparison of serum VIP levels between femoral head pre-collapse ONFH patients and femoral collapse ONFH patientsBack to article page