To evaluate the effectiveness of the method Proprioceptive Neuromuscular Facilitation (PNF) as physical therapy approach to the reduction of pain and improvement in functional performance and quality of life in women with knee osteoarthritis.

Patients will be divided into two groups: group perform proprioceptive neuromuscular facilitation and other group submit performing resistance exercises.

Inclusion Criteria:

• Women;
• Age between 50 and 80 years;
• Clinical diagnosis of Osteoarthritis of knees ;
• Patients with presence of at least 90 ° range of motion of knee flexion ;
• Do not practitioners of physical exercise and physical therapy during the period of participation in the survey

Exclusion Criteria:

• Diagnosis of other rheumatological and neurological diseases ;
• orthopedic surgery History in the lower limbs ;
• Individuals with muscle strength of the lower limbs <3 ;
• Cognitive impairment or neurological disease that compromises the understanding and implementation of the Protocol (Mini Mental State Examination <18 for the illiterate and <24 for others);
• Body mass index ≥ 30.0 (obesity , according to the World Health Organization ) .
• Individuals classified as physical activity level "very active" by the IPAQ (International Physical Activity Questionnaire ) .