In my team outpatients we have two spinal classes that my staff use Swiss balls in. Alow efforet class working on core stablity and a more aerobic one. I also use Swiss balls in my OA knee School to encourage patients with asscociated LBP to develop core stablity. we find most of our patients buy their own balls, very popular. we are doing an audit of the classses using a Roland Morris Questionarire before and after, to assess the outcome. Would be interested if you have used any outcome measurements