text: what is the arthritis index? i have arthritis in my left hip.  it gets bad and then other days it gets better.  is it weather related? different health articles claim weather has nothing to do with arthritis...my opinion says they are probably right. they have determined that mild exercising helps (every day) and moving around is good treatment. i would say the arthritis index may have to do with pain or range of motion...go to webmd and type in arthritis index  thanks