Where does it come from?
Sciatica is defined as pain beginning in the back, radiating into the buttock and into the leg. Is the leg pain originating in the spine (rarely higher)? Is the leg pain orginating in the pelvis? Is the leg pain orginiating in the leg?

Sciatica Origins
Spine
Pelvis
Leg

Is the leg pain really sciatica or is there another cause that is not nerve but mimicks the pain of sciatica?