Fig. 2From: Decreased serum MMP-9 levels in patients with nontraumatic osteonecrosis of the femoral headA Comparison of serum MMP-9 and TIMP-1 levels between ONFH patients and healthy controls. B Comparison of serum APN levels among different steroid use, alcohol use, and idiopathic groups. C Comparison of the MMP-9/TIMP-1 ratio between ONFH patients and healthy controls. Data are expressed as the mean ± SD. NS, p > 0.05; *p < 0.05Back to article page