“…However, authors of a long-term follow-up study of patients having a course of injections failed to reveal a lasting benefit (beyond 3 years) in patients with degenerative disc disease, herniated discs, lumbar radicular pain, or spinal stenosis [8,9,20,49,60]. However, a two studies of patients with spinal stenosis [12,48] demonstrated a significant (P \ 0.05) improvement in short-term benefits (decreasing of pain, improvement of functional measures and lower operative rate) after ESI. In a study restricted to patients with symptomatic lumbar stenosis, Hoogmartens and Morelle [27] found that 48% of patients treated with ESI demonstrated functional improvement from their preinjection status approximately 2 years after treatment.…”