Focal Microvibration and Chronic Lumbosacral Radicular Pain

The goal of this clinical trial is to investigate the effectiveness of focal microvibration on patients affected by chronic lumbosacral radicular pain. The main question\[s\] it aims to answer are: * Can focal microvibration improve pain in this patient population? * Can focal microvibration improve quality of life in these patients? Participants will attach to their skin four little devices (10x20x0,5mm) delivering focal microvibration in the painful area according to researchers indications for 6 hours/day every day except Thursday and Sunday. Researchers will compare patients treated with focal microvibration to patients treated with a sham device and to patients treated with standard pharmacological therapy.