Pain is the most common reason for a GP appointment — not surprisingly, given that up to a half of all Britons live with daily pain. Following the advice of pain specialist and sufferer Dr Helena Miranda on Saturday, today the Mail launches a series of essential expert guides to tackling common problems — back pain, migraine, headache and, here, arthritis — to help stop pain ruling your life. Osteoarthritis need not be the end of the world — or a stellar tennis career. In January, after years of pain, three-time Grand Slam tennis champion Andy Murray had surgery to...