Infiltration is the diffusion or accumulation of substances not normal to it or in amounts in excess … As part of medical intervention, local anaesthetics may be injected at more than one point so as to infiltrate an area prior to a surgical procedure. Wound infiltration for surgery. Wound infiltration with local anaesthetics is a simple, effective and inexpensive means of providing good analgesia for a variety of surgical procedures without any major side-effects.
Rhizotomy is a surgical procedure to sever nerve roots in the spinal cord. The procedure effectively relieves chronic back pain and muscle spasms. For spinal joint pain, a facet rhizotomy may provide lasting low back pain relief by disabling the sensory nerve at the facet joint.