<qa>  What is the outcome of the patients 2 years after referral?The purpose of this study is to answer the following questions: 1 What is the proportion of patients operated upon after referral to surgical evaluation with positive MRI findings, persistent low back pain, and poor outcome following non-operative treatment? 2 What was the outcome in these patients 2 years following referral? 3 Where any baseline variables predictive of good or poor postsurgical outcome? 4 Where there any difference in outcome in patients with or without surgery? 