People with hip and knee osteoarthritis are advised to wear " appropriate footwear " to minimise their pain. Does that mean heels are out? Does it matter if you wear runners or something a little stiffer? How about using insoles? Our research, including our latest clinical trial published today in Annals of Internal Medicine , provides some answers. We show that stable, more supportive shoes aren't necessarily the best option, despite what you might have heard. What is osteoarthritis?