Analgo-sedation is a modern anesthesia option that combines a local anesthestic (analgesia) with a tranquilizer (sedation). The patient is pain-free and sleepy, but does not lose consciousness and hence remains responsive. The procedure has fewer risks and side effects than general anesthesia. The really big advantage for disc surgery: The patient becomes alert when the surgeon comes too close to the nerve fibres. With this immediate feedback, nerve damage during surgery is almost completely excluded.