Always do physical therapy first... do it and stick with it. Surgery should be your last resort.
I've had a pretty severe L4/L5 disk rupture before, at times in my life my left leg would go numb and the muscle atrophied and shrunk to half the size.
Chiropractors were a waste of time and money. Exercise, back and abdomen strengthening and stretching is what gets you back on your feet and functional.
Fusing two vertebrae has a downside of putting extra strain on the adjoining disks and may increase the chance of a rupture there.
victor809 wrote: