Figure 2

The points used in the trial. The lines refer to acupoints of ‘Liangqiu’ (ST34) and ‘Dubi’ (ST35) on the lateral side of the knee, and ‘Xuehai’ (SP10) and ‘Neixiyan’ (EX-LE5) on the medial side of the knee. The points lateral to the above four acupoints refer to non-acupoints.