Hi there

One of the main issues with spinal surgery is that it attempts to treat a symptom rather than a cause.
The spine is held up, and in alignment, by muscles and if one of those muscles malfunctions and foreshortens it can pull the spine out of its proper alignment.

To give you an exsample:
The quadriceps in the front of the upper leg pull the front of the pelvis in a forward and downward direction. The hamstrings in the back of the upper leg pull the back of the pelvis in a downward direction.

Muscles work antagonistic, which means one needs to turn off and the opposing muscle needs to turn on.
If the quads are in under energy, they pull the pelvis down continually and this means the hamstrings can not pull back and the pelvis increases its forward angle from a normal 8° to an abnormal 12°.

The pelvis supports the sacrum on which the spine rests. This will also increase in angle, causing a misalignment between S1 and L5.
You can do all sorts of operations on this but the weak muscle that caused the issue in the first place, is still a weak muscle and continues to pull the pelvis out of alignment, this time stressing the segment above the surgically corrected one, and so on.

After the first surgery you can expect 85% mobility, after the second one, a possible 50%, after which, if you are smart, you give up on your primary or secondary, or even tertiary surgeon, and he on you.

The whole issue can be corrected by a competent Kinesiologist, who will test about 45 muscles in an initial assesment, correct as he goes, and if he find muscles that are under energised, he will find out what causes the weakness , or see a chiropractor trained in Applied Kinesiology who will do the same thing and correct any spinal impingements he finds.

All this can be done for less than $200.
Look up Kinesiology on the net, or ICAk, which stands for International college of Applied Kinesiologist. There you'll find addresses to your nearest professional practitioner.

Good luck

Kinetico