When would a doc recommend spine fusion surgery?

Teo reasons: Spinal instability and deformity progressive these two indications are not controversial or part of a recionstruction that requires support and stillness forl long term success.

Several reasons: To treat an unstable or potentially unstable spine fracture. For certain deformities ie. Scoliosis that may have become large or show they will progress to be large need fusions. Certain instabilities that occur that can be treated most of the time nonop but occasionally need fusion since they don't respond. Sometimes during a spine surgery for other issues a lot of bone removed & fusion needed.