Nerves can also be overstretched if having to accommodate a herniated disc or bony growth. The symptoms will be the same as for pinched nerves, with transmission problems. If a nerve is stretched and breaks then the nerve may be able to grow back, assuming that the insulation remains intact. If a nerve is cut then the end farthest from the spinal cord dies. The nerve may, in some cases, grow back very slowly from the root end down the intact insulation until it reaches a receptor again. This can take years and will only occur if the insulation has not also been cut. If a nerve and the insulation are cut then the nerve fibers can sometimes grow into a ball at the severed end forming scar tissue referred to as a neuroma. Neuromas can be extremely painful as this sensitive ball of nerve fibers can cause an electrical sensation when the area is touched.
Kenalog in blood - Derby et al. "Size and aggregation of corticosteroids used for epidural injections"
Before the injection procedure begins, topical anesthesia is applied to the skin. Next, in order to prevent healthy nerve roots from being exposed to too much medication, the physician will use imaging technology such as fluoroscopy to guide the insertion of the needle and to confirm its correct placement in the epidural space. In addition, contrast dye is typically injected in order to observe where the medication will be administered and to ensure that it will be properly distributed throughout the targets areas. The administration of steroids and an anesthetic such as Lidocaine directly onto the nerves roots results in dramatic or complete pain relief. The steroid decreases inflammation, while the anesthetic disrupts pain signal transmission.