All it is is an injection of steroids around the nerve that is causing the pain. This "heals" the nerve endings causing you grief. It is not a permanent fix but may or may not give temporary relief. I have had lots of these in my back for pain. My Dad has had them in his shoulder. They tend to them as a pain relief where other methods have failed- physio etc. Steroids are immense healers and when given as an injection, have very few side effects as the dose is relatively small. It can "fix" the area, but does wear off after a few months. It can also take a few weeks to work. Sometimes it does not work at all. It's worth a try. Just make sure that you can really point to the precise place where it hurts, cos that's where they will do the injection. Get it wrong, and it's a waste of time! I think you can have up to 3 injections a year.