Judy, I've had several clients with unsuccessful lumbar surgery, then later have their sciatica resolved with piriformis surgery. One ID'd it with a diagnostic injection. Others went to piriformis specialists. Any spine surgeon or pain management doctor SHOULD BE able to rule it in or out. Too many of them won't take this diagnosis seriously and don't consider it.
Ask your one of your docs. I've not done this, but I'm told that if you search youtube you'll find videos with instructions on how to sit and move to trigger piriformis syndrome (PS) if that is the problem.
Mark
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