Introduction: The osteoarthrosis is incurable, one of the most incapacitating disease around the world and your prevalence is increasing every year. The main consequences of this disease is pain and loss of functionality as a result of biomechanical limitations coming from articular inflammation. Among the variability of therapeutic resources, we propose MatPilates like a no drug intervention, that probably will contribute for a decrease in the symptoms of this disease.

Objective: It is hypothesized that MatPilates is a method capable of decrease pain and increase functionality in elderly woman with osteoarthrosis.

Methods: This study is a randomized double blind clinical trial, in which the volunteer need be in between 60 and 69 years old. Will be formed of two groups: MatPilates Group (MG) and Control Group (CG), and the ideal "n" will be calculated in a pilot study.

Inclusion Criteria:

• Bilateral osteoarthritis
• Body mass index (BMI) between 25 and 34,9 (WHO, 2000)
• Mini mental state examination score, with cutoff score of 18 (illiterate) and 24 (literate) (BRUCKI et al. 2003; LOURENÇO e VERAS, 2006)
• Unassisted gait (no wheelchair, no walking stick, no crutches or no walker)
• No history of neurologic disease
• No other physical activity
• Never practiced Pilates

Exclusion Criteria:

• Change in habitual drug's program during the study
• Join in other physical activity during the study
• Refuse to wear suitable clothing

The one who assess the patients in the beginning and in the final moment (investigator) not know in what group the patient is. As the investigator that will do the statistic (outcome assessor).