Assessing the Impact of Isokinetic Muscular Strengthening in Eccentric Mode in the Medical Treatment of Knee Osteoarthritis

Inclusion Criteria: * Patient male or female, age ranging from 40 to 70 years old * Patient suffering from one-sided knee O.A. regarding criteria of the American College of Rheumatology (A.C.R.), with radiologic score ranging from 2 to 3 according to the Kellgren \& Lawrence classification. * Patient receiving medical support * Patient that did not receive any infiltration on knee within two months before randomisation. * Patient free from any disease that could be a contraindication to the study treatment * Patient able to understand the protocol and willing to comply with its rules. * Patient willing to give consent. * Patient affiliated to the french social secu Exclusion Criteria: * Patient carrying prosthesis. * Patient suffering from inflammatory arthritis, or flare of arthritis. * Patient suffering from symptomatic patellofemoral osteoarthritis. * Patient suffering from cardio-vascular or pneumologic disease that could a contraindication to the study treatment. * Patient suffering from any pathology that could cause muscular weakness (myopathy, neuropathy, hemiplegia...)