Fig. 4From: Decreased serum MMP-9 levels in patients with nontraumatic osteonecrosis of the femoral headA Correlation of serum MMP-9 levels with VAS scores. B Correlation of the MMP-9/TIMP-1 ratio with VAS scores. C Correlation of serum MMP-9 levels with HHS scores. D Correlation of the MMP-9/TIMP-1 ratio with HHS scoresBack to article page