Efficacy and Safety of Acupuncture for Degenerative Lumbar Spinal Stenosis

Shenshu (BL23), Dachangshu (BL25), Weizhong (BL40), Chengshan (BL57), Taixi (KI3) acupoints will be used. For bilateral Dachangshu (BL 25), the needle will be inserted vertically at approximately 40-70 mm until participants got a electric shock feeling downward to calves, then the needle should be elevated up 2 mm, without rotating or lifting. For other four acupoints (BL23, BL40, BL57, KI3), they will be inserted 10 to 15 mm in depth with three times light amplitude rotation and lift to induce a sensation of soreness. The manipulations will be performed 3 times in total during 1 session (every 10 min). There are 24 treatment sessions after baseline, 3 times a week, and the patients will undergo a 30-min treatment each session.

Acupuncturists will use blunt tip needles (Huatuo, Suzhou, China) that cannot penetrate skin and stimulate deep tissues, and the thrusting and twisting motions will be used by acupuncturists to simulate the treatment and blind the patients. Each placebo needle consists of four parts: needle handle, needle body, blunt tip and adhesive pad. The chosen of acupoints, treatment duration, and frequency of sessions will be the same as the acupuncture group. To guarantee blinding, the investigators will make appointments with each participant on alternate days to prevent crosstalk among groups.