To achieve the proposed objectives it will be performed a randomized, triple-blind (patients, therapists, outcome assessors), placebo-controlled trial, with voluntary patients with chronic knee pain. Eighty-six patients will be randomly allocated to two treatment groups: 1. Active Multi Radiance Medical® Super Pulsed Laser or Placebo Multi Radiance Medical® Super Pulsed Laser. The patients will be treated by a blinded therapist.
Treatment administration will be performed 3 times a week, for four consecutive weeks, yielding 12 treatments (each treatment administration one to two days apart).
The outcomes will be obtained at the stabilization phase, baseline (pre-procedure), end of treatment and one week after the conclusion of treatment.
The data will be collected by a blinded assessor. The statistical analysis will follow the intention-to-treat principles.
The project was also approved by the Research Ethics Committee from Universidade Nove de Julho, under the number 5.332.202. Board Affiliation: Comissão Nacional de Ética em Pesquisa (CONEP) Phone: +55113385-9010 - Email: comitedeetica@uninove.br Address: Vergueiro nº 235/249. Liberdade, Sao Paulo, Sao Paulo, Brazil.
The investigators will analyze: degree of pain, levels of prostaglandin E2, subjective knee evaluation, patient satisfaction, blinded efficacy and adverse events.