https://www.nice.org.uk/guidance/cg173/chapter/1-recommendat...
http://pathways.nice.org.uk/pathways/low-back-pain-early-man...
http://pathways.nice.org.uk/pathways/opioids-for-pain-relief...
(There's lots on NICE. That's the organisation that assesses effectiveness and cost effectiveness of treatments, and makes recommendations about whether they should be used in English National Health Service. I guess this is one of the "death panels" we have in this country.)
BBC Radio Four have a programme called Inside Health. They had an episode on the benefits of exercise, including exercise as a treatment for arthritis pain. Sadly, BBC geoblock some programmes. (I have no idea which ones either.) http://www.bbc.co.uk/programmes/b06vkg24