Figure 1: Effect of Epimedium extract and icariin on rat sciatic functional index (SFI). At week 2 and week 4, the SFI values are significantly better in rats of the Epimedium group than those of the control group. Moreover, the icariin group is better than the control group. At week 8, the sciatic functional index was not significantly different among the control, Epimedium extract and icariin groups. , the Epimedium group versus the control group; , the icariin group versus the control group ( ).