JointADventure: A Worksite Activity-Diet Intervention for Chronic Knee Pain

We will utilize a partnership with Blue Cross Blue Shield of Illinois (BCBSIL), a highly supportive wellness partner, with a strong history of investment in the health of its employees and subscribers. The combined Activity/Dietary (AD) intervention is administered by health professionals trained in motivational interviewing as healthy lifestyle coaches. Over the first 6 months, the coaches provide: * individualized counseling based on a comprehensive assessment of baseline clinical, functional and behavioral factors that are barriers to healthy physical activity and dietary behaviors * group education, the content of which is modeled after the highly successful Diabetes Prevention Program physical activity/dietary intervention, and customized for those with knee symptoms. Follow-up assessments continue for 6 additional months. Specific aims are to: 1. assess the feasibility of conducting a randomized controlled trial of the JointADventure intervention at this worksite 2. estimate the effectiveness of the intervention to decrease body weight, improve dietary habits, and increase objectively-measured physical activity 3. to improve objectively measured functional performance 4. to improve self-reported arthritis-specific and generic health status and health utility