Please do NOT directly into a limb that has RSD!!! I had a nerve block injected directly into my leg that has RSD And it made me solo much worse and I was wheelchair bound for over a year!! Unfortunately, my PM Doctor didn't know at that time that you shouldn't inject directly into a limb affected by RSD at that time and it was only after I had the nerve block that my mum found an article on the internet stating that you should never inject into an RSD limb unless it is absolutely neccasary. I don't want to scare you but wanted to let you know about my experience and what my doctor said before you make any decisions. All the best and if you have any questions, please let me know.