8/10. Joint Replacements. Hip replacements were first developed in the 1960s, changing the lives of those with hip arthritis. Knee replacement was harder to develop, but is now one of the most common operations in the UK. Dr Mark Porter examines the newest techniques in joint replacement as well as finding out what to expect after an operation and which joints could be replaced in the future. Producer Geraldine Fitzgerald Repeated tomorrow at 4.30pm