Fig. 5From: Ultrasound-guided percutaneous peripheral nerve stimulation for analgesia following total knee arthroplasty: a prospective feasibility studyA small-diameter (0.2Â mm) open-coiled, helical electrical lead with an anchoring wire (MicroLead, SPR Therapeutics, LLC, Cleveland, OH; figure used with permission from Brian M. Ilfeld, MD, MS)Back to article page