Trigger Point Injections
Trigger Points and Trigger Point Injections
Trigger points are focal, hyperirritable spots or “knots” located in a tight band of skeletal muscle.
Trigger points produce pain locally and/or irritate the surrounding nerves causing referred pain
to other parts of the body. When pressure is applied over the trigger point, a twitch or jump
response is often elicited. Chronic repetitive use of the muscle or acute trauma can lead to the
development of a trigger point. Common areas where trigger points are found include: upper
trapezius, rhomboids, and lower back region. A series of 4-8 trigger point injections over a 4
week period, using a small amount of Lidocaine 1%, can be used to relieve pain and relax the
muscle. The risks of trigger point injections are minor and include: bruising, bleeding, infection,
and soreness at the injection site. Post-injection soreness is common, and to be expected in most
cases. After injections are performed the patient needs to remain active with stretching and
Alvarez, D.J. & Rockwell, P.G. (2002). Trigger Points: Diagnosis and Management. American
Family Physician, 65(4), 653-661.