A couple of possible reasons may be:
1. The pain is coming from somewhere else and the injectant is being applied to the wrong area.
2. The injection is being performed in the right area, but the injectant is unable to get to the inflammation site because it is blocked by scar tissue, for some reason flows elsewhere or the injection somehow 'missed'.
3. The injectant may get to the area needed and may reduce inflammation, but the pain generators are so profound that they are not significantly impacted by the injection. (like when an amputee percieves pain in an foot that no longer exists.) Permanent nerve damage causing phantom pain?
|