 Material and method: it will be performed a prospective, controlled and randomized study eith a blind evaluator on patients with symptomatic knee osteoarthritis submitted to joint injection. A hundred patients suffering of symptomatic knee osteoarthritis coming from the outpatient area of Rheumatology Division of Federal University of Sao Paulo UNIFESP will be evaluated, 50 belonging to the intervention group reception and 50 to a control group. 