TRIGGER POINT INJECTIONS
Useful for the muscle. Not an answer to why the muscle is behaving that way.
They can break a painful cycle in a genuinely tight band of muscle, and they are among the most over-used procedures in pain medicine because they are easy to do and easy to repeat.
What they are
A trigger point is a discrete, palpable, exquisitely tender band within a muscle that reproduces a person’s familiar pain when pressed. The injection places a small volume of local anesthetic, sometimes with dry needling of the band itself, to interrupt the contracted segment.
The mechanism is mechanical and neurological rather than anti-inflammatory. Needling disrupts the taut band; the anesthetic interrupts the pain-spasm loop long enough for normal movement to be reintroduced.
When they are reasonable
- A clearly palpable, reproducible trigger point that recreates your specific pain.
- Myofascial pain that has not responded to manual therapy and movement work.
- As an adjunct that opens a window for rehabilitation, with the rehabilitation actually scheduled.
- As a diagnostic step where it is unclear how much of the pain is muscular.
When they are not
As a standing monthly appointment with no endpoint. As a substitute for identifying the joint, disc or nerve the muscle is guarding. And as the entire treatment plan for someone whose examination has never been done properly.
Muscles rarely become painful without a reason. Persistent trigger points in the lumbar paraspinals are frequently secondary to a facet joint or a sacroiliac joint doing something the muscle is trying to protect. Inject the muscle and you get relief that lasts until the guarding restarts, which is not failure of the injection so much as failure of the reasoning behind it. Why muscles guard.
If you have had more than a few rounds without lasting change, the useful next step is not another round. It is a diagnostic look at what the muscle is protecting. When injections stop working.
What to expect
- The band is located by palpation and you confirm it reproduces your pain.
- A fine needle, local anesthetic, no sedation. A brief twitch response is common and is a good sign the band was engaged.
- Soreness for a day or two afterward, sometimes more than before.
- Move within the window. The point is to reintroduce normal motion while the band is quiet; without that it simply retightens.
Risks
Low. Soreness, bruising, and rarely infection. In the thoracic region, and in thin patients, needle depth matters because of the pleura — a real if uncommon consideration that belongs in the consent conversation rather than a reassurance.
Common questions
How long does relief last?
Days to a few weeks typically. Longer when the underlying driver has been addressed alongside; shorter when it has not.
Is dry needling the same thing?
Similar mechanism without the anesthetic. Evidence for the two is broadly comparable and the choice is often practical.
How many can I have?
There is no fixed number and no course here. Each is a decision based on what the previous one achieved, and a series with no lasting change is a signal to change the plan.
Related reading
Worth doing once with a plan attached
If a trigger point injection is the whole plan rather than part of one, ask what it is opening a window for.
12174 Natural Bridge Rd, Suite 301
St. Louis, MO 63044
At DePaul Hospital on Natural Bridge Road, inside the I-270 and I-70 interchange, on the west side of the airport.
Sources
- Lehn C et al. Trigger Point Injection for Low Back Pain. American family physician, 2023. PubMed 37440745
- Lajeunesse MD et al. Trigger Point Injection for Myofascial Pain Syndrome of the Low Back: A Partially Blinded Three-Arm Randomized Controlled Trial. Annals of emergency medicine, 2025. PubMed 40531073
- Debrosse M et al. Trigger point injection therapies for chronic myofascial neck and back pain: A systematic review. Interventional pain medicine, 2022. PubMed 39238525
- Cashin AG et al. Efficacy, acceptability, and safety of muscle relaxants for adults with non-specific low back pain: systematic review and meta-analysis. BMJ (Clinical research ed.), 2021. PubMed 34233900