Trigger point injections are used to treat painful areas of the muscle, of areas of the muscle with a “knot”. A knot in the muscle is known to be caused by a tight band of muscle that is unable to relax. Trigger points are often found in the muscle of the back and neck, however they may occur elsewhere in the body. A physician will perform trigger point injections using ultrasonic guidance to deliver a local anesthetic into the belly of the painful muscle. Trigger point injections can be performed with or without use of a corticosteroid. Relief of inflammation and pain may take three to five days, however maximum relief may take up to two weeks.
Here are download Trigger Point instructions.