Some types of back surgery are far more predictable in terms of alleviating a patient’s symptoms than others. For instance, a discectomy (or microdiscectomy) for a lumbar disc herniation that is causing leg pain is a very predictable operation. However, a discectomy for a lumbar disc herniation that is causing lower back pain is far less likely to be successful. A spine fusion for spinal instability (e.g. spondylolisthesis) is a relatively predictable operation. However, a fusion surgery for multi-level lumbar degenerative disc disease is far less likely to be successful in reducing a patient’s pain after surgery. Therefore, the best way to avoid a spine surgery that leads to an unsuccessful result is to stick to operations that have a high degree of success and to make sure that an anatomic lesion that is amenable to surgical correction is identified preoperatively.