Many, especially the elderly, suffer from back pain due to spinal stenosis. Classically, these patients all too often receive pain therapy in the form of epidural infiltration therapy (PRIT = peripheral radical infiltration therapy, Rasz catheter, etc.).
A research group from Philadelphia, USA has now found that the group of patients who had received such syringe therapy before a stenosis operation performed overall had a significantly worse surgical result than the group of patients who was never infiltrated or received spray therapy.
Here you can find the detailed report Spine Journal Februar 2013