For the least complicated procedures, such as microdiscectomy, the predicted success rate is 90 percent or higher, reports Atlanta Spine Surgery. When the procedure is more complex, such as spinal fusion, the expected success rate lowers to 70 to 85 percent.
The success rate for spinal surgeries varies based on the accuracy of the diagnosis, the surgeon's experience, the patient's overall health and the definition of success used, reports the Atlantic Spine Center. Spinal surgery is an option when pain is persistent for more than two months and hasn't responded favorably to non-surgical treatments, according to Mayo Clinic. Spinal surgery is most successful in relieving arm and leg pain associated with back problems rather than back pain itself.