Feigenbaum’s published results are 70% have improvement. Be careful comparing these because the improvement that Feigenbaum publishes is in ANY symptom. So if you’re sitting better but everything else is the same then you are classified as part of the 70% good outcome. You might ask them what they mean by good outcome. Usually the primary goal of the surgery is to stop progression of the disease. Some also get symptomatic improvement of varying degrees. It will depend on how long you’ve had the condition, any other spine/neuro conditions, and your general health.