Trigger Point Injections
Trigger points are tight bands or knots that form when a muscle fails to relax after a contraction. These areas of pain and muscle spasm may develop due to acute trauma, overuse injuries or chronic muscular disorders. They usually occur in the upper back and shoulder muscles and may irritate adjacent nerves causing pain to radiate to the surrounding regions. Trigger point injections or TPI may contain an anesthetic, steroid or a combination of the two. They are administered to relieve pain and improve mobility.