Some patients report pain relief within the first few hours after the injection, but pain may return later that day as the local anesthetic wears off. Longer-term relief is obtained when this kind of procedure is performed in conjunction with some form of manual therapy, such as osteopathic or chiropractic manipulation or physical therapy measures.
How long the pain relief lasts varies person to person. For some, the relief lasts several months or longer. If the treatment works for you, you can have periodic injections to stay pain-free.