Fig. 6From: Ultrasound-guided percutaneous peripheral nerve stimulation for analgesia following total knee arthroplasty: a prospective feasibility studyThe therapeutic window and the ability to preferentially activate the targeted large nerve fibers—without activating non-targeted pain or motor neurons—increases as the distance between the electrode and the nerve increases (illustration used with permission from Brian M. Ilfeld, MD, MS)Back to article page