Evaluation of a Distraction-rotation Knee Unloader Brace in Patients With Medial Knee Osteoarthritis.

Inclusion Criteria: * Patient understanding simple order and able to give written consent. * Man or woman with age between 40 et 75 years * Unilateral medial symptomatic knee osteoarthritis, defined using the American College of Rheumatology classification * Radiologic grade II, III ou IV (Kellgren et Lawrence (KL) classification) * Medial knee compartment (Medial K\&L g rade higher than lateral K\&L grade * Knee pain \> 40/100 on visual analog scale and \<30/100 for the other * No change in medical treatment for at least 3 months. * Latest radiographic image \< 12 months before inclusion Exclusion Criteria: * Patient without healthcare insurance. * Inflammatory knee arthritis, * Indication of knee surgery * Pregnancy, breastfeeding * Associate neurologic or orthopaedic affection that interferes with gait analysis * Rapidly destructive arthritis. * Alzheimer's disease, Parkinson's disease, motor neuronal disorders * Patient under guardianship or tutelage