Can you tell me a success story in treatment of low back pain due to sacralization l5?

There are many: I would suggest you see a spin specialist to ask what are truly your options for relief. The sacralization is not really the issue its something else, facet joints, disk herniation, tears in the disks, muscles issues... Either way, i recommend seeing fellowship trained spine/pain specialist to address your concerns.

Rarely the problem: A sacralized L5 segement suggests that this level is fused with the sacrum. This means there is no motion at the disc so should not cause pain. In some people, they can have a pseudo-articulation (or false joint) form where L5 and s1 are still connected. This can be a pain generator but can be tough to treat. A diagnostic injection can help determine if this where the pain is coming from.

Yes Many: Sacralization of the L5 is not generally the only problem you may have. Often times the spinal levels above them cause more problems, however I would suggest seeing a spine/pain fellowship trained physician who can address your real concerns and educate you on what to do for relief and what you may be able to do to maintain relief as well.