ENDOSCOPIC ELECTRODE IMPLANTATION FOR ENHANCED STIMULATION OF THE HAMSTRING BRANCHES OF THE SCIATIC-NERVE IN PARALYZED SUBJECTS

Seven hamstring branches of the sciatic nerves in eight posterior thig hs of four paraplegics were implanted with electrodes endoscopically. Strong initial responses were obtained in each case on continuous elec trical stimulation. Three of the implants were removed immediately due to rapid decay in the response to stimulation; two had muscle power r educed to grade IV and two to grade III over 2-week period postoperati vely. We believe the reduction in strength was partly due to hematoma surrounding the electrode and partly due to migration of the electrode away from the target nerves. Further work needs to be done to improve the technique and implant designs to improve results. Due to the exce llent visual control it offers, this technique has the potential for a ccurate implantation of electrodes without massive exposures and its a ttendant morbidity.