Transcutaneous Tibial Neuro-stimulation to Improve Voiding Dysfunction in Multiple Sclerosis.

Inclusion Criteria: * Patient with a diagnosis of multiple sclerosis * Patient with bladder-sphincter dyssinergia * Patient using clean intermittent self-catheterization as exclusive bladder management * Patient who has given written consent * Socially insured patient * Patient willing to comply with all study procedures and study duration Exclusion Criteria: * Patient with other associated neurological pathology * Patient with an Expanded Disability Status Scale (EDSS) score ≥ 6 * Patient with recurrent urinary tract infections (\> 3 episodes / year) * Patient with uncontrolled overactive bladder * Patient with uncontrolled detrusor hyperactivity * Patient with a bladder compliance disorder * Patient with tibial neuro-stimulation in the last 3 months * Patient treated with a sacral neuro-modulation * Patient who has received an intradermal injection of botulinum toxin A within the last 9 -months Patient who received alpha-blocker treatment within the last month Patient with benign prostatic hypertrophy (prostate volume \> 40 cc) - Last ultrasound scan \< 6 months. Patient with one or more bladder diverticulum(s) Patient with unilateral or bilateral renal Patient with unilateral or bilateral vesico-ureteral reflux Patient with impaired renal function (GFR according to CKD-EPI \< 60 ml/min/1.73m2) Patient with a metallic prosthesis on the lower limb Patient with a Pacemaker Pregnant patient