For a general overview of what’s out there, visit the website of NIAMS: the National Institute of Arthritis and Musculoskeletal and Skin Diseases. It’s one of the research institutes of the National Institutes of Health. Click here to get a decent overview of options and issues. It’s not perfect—it’s possibly influenced by the FDA, an agency that is very much under the thumb of pharmaceutical companies and device manufacturers—but a it’s decent source to start with.