Common subgroups of low back pain of IVD origin include lumbar disc herniation, internal disc disruption (IDD), and degenerative disc disease (DDD). DDD also contributes to the pathogenesis of secondary spinal disorders such as spinal stenosis and degenerative spondylolisthesis. Lumbar Canal stenosis is a progressive degenerative disorder of the spine most frequently causing morbidity in middle aged and elderly. The diagnosis is essentially clinical and only supported by radiological investigations. The natural course of spinal stenosis is that a substantial proportion of patients do not automatically deteriorate and will remain unchanged or even improved by nonoperative treatment. Ultimately, patient desire combined with failure of conservative treatment with physical therapy, activity modification, medication, and steroid injections drives the decision for operative treatment. Proper patient selection is critical to achieving a good outcome with spinal stenosis surgery. The ideal patient has symptoms of neurogenic claudication, which includes pain, numbness, and paresthesias in the posterolateral legs and thighs associated with prolonged walking or with activities causing back extension such as walking up stairs. In properly selected patients, there is a significant improvement in symptoms and ODI score over a follow–up of 9 months, the maximum improvement occurring upto 3 months post–surgery. Age less than 65 years, duration of symptoms less than 12 months, lower number of levels involved were positively correlated with better post–op results. Thus it can be concluded that predictors of clinical and neurological recovery in operated cases of degenerative lumbo–sacral spine disorders are age of the patient, duration of symptoms and number of intervertebral levels involved.