Methods: Through a randomized controlled clinical trial with blind assessment and follow-up of six months. Fifty-Two participants were randomized into two groups: group orthosis and control, and made a night orthosis II and or III fingers, thermoplastic will be used as a treatment for participants orthosis group. The participants underwent four evaluations at time 0, 45 days, 90 days and 180 days after its inclusion in the study. The variables studied were: the visual analog scale of pain, grip and pinch strength, questionnaires Cochin and Australian/Canadian Hand Osteoarthritis Index and functional Pick-up test.