Fig. 4From: Cerebral mechanism of opposing needling for managing acute pain after unilateral total knee arthroplasty: study protocol for a randomized, sham-controlled clinical trialDifference in the needles and acupuncture depth between the electroacupuncture and sham electroacupuncture groups. The tip of the pragmatic placebo needle (left) is blunt. The needle will be inserted into a sterile adhesive pad without puncturing the skin. The regular acupuncture needles (right) will be inserted into the skin of the corresponding acupoints through a sterile adhesiveBack to article page