People with severe knee osteoarthritis who want to delay or can't undergo surgery have other options.
Unlike with a corticosteroid shot, which is injected into the joint, the anesthetic that is injected for a nerve block stays outside the joint. "We want to target nerves before they dive into the knee," says Dr. Bolash. "If I wanted to cut off electricity to your house, I wouldn't go around to every lamp. I would cut it off before it gets into the house."