Prolotherapy Trigger Point Injections for Myofascial Pain: What the Research Shows
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By Dr. Jeffrey Peng, MD · Published March 5, 2026 · 5 min read
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Myofascial pain syndrome is one of the most common and frustrating musculoskeletal conditions encountered in clinical practice. Characterized by painful trigger points within taut bands of skeletal muscle, it can significantly diminish quality of life and prove remarkably difficult to manage. Clinicians have long relied on a multimodal approach — combining heat therapy, cardiovascular and resistance exercise, stretching, and soft tissue techniques such as foam rolling or acupressure — to address persistent symptoms.
For patients whose pain persists despite these conservative measures, trigger point injections offer a more targeted intervention. A growing body of evidence suggests that adding dextrose solution — the basis of prolotherapy — to these injections may significantly improve outcomes. Two recent clinical studies examined whether dextrose prolotherapy trigger point injections can meaningfully reduce pain in patients with refractory myofascial pain syndrome.
What Is Myofascial Pain Syndrome and the Energy Crisis Hypothesis?
Myofascial pain syndrome develops when trigger points — hyperirritable nodules within taut bands of muscle — become a source of chronic, localized, and sometimes referred pain. The prevailing explanation for why these trigger points persist is known as the energy crisis hypothesis.
In brief, a trigger point restricts local blood flow to the muscle. This reduced perfusion alters the biochemical environment within the tissue, creating a chemical imbalance that promotes sustained muscle fiber contracture. The contracture further compresses local blood vessels, perpetuating the cycle of ischemia, abnormal chemistry, and spasm. This self-reinforcing loop — often referred to as the trigger point pain cycle — is why myofascial pain can become so persistent and difficult to break.
How Does Prolotherapy Work for Trigger Points?
Prolotherapy involves the injection of a dextrose (sugar) solution into damaged or painful tissue. The proposed mechanism is that the dextrose stimulates a controlled local inflammatory response, which in turn activates the body's natural healing cascade — including the release of growth factors and inflammatory mediators that promote tissue repair and remodeling.
When applied to myofascial trigger points, this approach has a compelling theoretical rationale. By stimulating local inflammation and tissue remodeling, dextrose injections may help correct the biochemical imbalance within the muscle and terminate the sustained fiber contractures that drive the energy crisis cycle. In essence, prolotherapy may offer a way to break the self-perpetuating loop of pain, contracture, and restricted blood flow that characterizes chronic myofascial pain.
Can Dextrose Injections Relieve Refractory Myofascial Pain?
The first study was a retrospective case series published in the Journal of the Chinese Medical Association that evaluated 45 patients with myofascial pain syndrome refractory to prior treatments (Chou et al., 2020). The investigators performed targeted, ultrasound-guided injections of 10 cc of 15% dextrose solution into the affected muscle fascicles and the perimysium between them. Injection sites spanned the upper extremities, lower extremities, and axial musculature.
The results were striking. The mean pretreatment visual analog scale (VAS) pain score was 7.0 out of 10, and at one month follow-up, the mean posttreatment score had dropped to 2.4 — representing an overall 65% reduction in pain severity. Eleven of the 45 patients (24%) reported complete resolution of their symptoms, and only 3 patients (7%) experienced no improvement or worsening. This means that approximately 93% of patients noted meaningful pain relief after a single dextrose prolotherapy injection. Importantly, no adverse reactions or complications were reported.
Does Prolotherapy Help Posterior Shoulder Myofascial Pain?
The second study, also published in the Journal of the Chinese Medical Association, focused specifically on 57 patients with chronic posterior shoulder myofascial pain (Lai et al., 2021). All participants had experienced pain for at least three months with a VAS score of at least 4 out of 10, and all had trigger points in the infraspinatus and/or teres minor muscles. Every patient had failed prior treatment with oral pain medications and physical therapy.
The clinicians performed ultrasound-guided perimysium dissection using 10 cc of 15% dextrose solution targeted to the affected muscles. The mean pretreatment VAS score was 7.2 out of 10, which decreased to 1.9 at four weeks after injection. Nineteen participants (33%) were completely pain-free after treatment, and only 6 patients (approximately 11%) did not experience any relief. Overall, about 89% of patients reported meaningful improvement. Only one patient required a second injection, and no complications — including infection, allergic reaction, or bleeding — were observed.
What Are the Limitations of the Current Evidence?
While these results are encouraging, it is important to interpret them within the context of their study design. Both investigations were retrospective case series without control groups, which means we cannot definitively attribute the improvements to the dextrose injections alone. The placebo effect, the mechanical disruption of the needle itself (sometimes called the "needling effect"), or natural history of the condition could all have contributed to the observed benefits.
Additionally, both studies reported outcomes at only four weeks of follow-up. While a one-month improvement can be truly life-changing for patients suffering from chronic pain, longer-term outcome data would be valuable to determine whether the benefits are sustained. Ideally, future randomized controlled trials with sham-injection control groups and extended follow-up periods will help clarify the true efficacy and durability of dextrose prolotherapy for myofascial trigger points.
Should You Consider Prolotherapy for Your Trigger Points?
Prolotherapy with dextrose injection is a promising treatment option for patients with refractory myofascial pain syndrome. The available evidence, while preliminary, suggests that ultrasound-guided dextrose injections can produce substantial pain relief in the majority of patients — with a favorable safety profile and low cost. Dextrose is inexpensive, widely available, and well-tolerated, making it an attractive option when other treatments have failed.
In my practice, I recommend a stepwise approach to myofascial pain: begin with heat, exercise (both cardiovascular and resistance training), targeted stretching, and soft tissue mobilization techniques. For patients who continue to experience significant symptoms despite these measures, trigger point injections with dextrose prolotherapy represent a reasonable next step. If you are dealing with persistent trigger point pain, this is a treatment worth discussing with your sports medicine provider.
References
1. Chou Y, Chiou HJ, Wang HK, Lai YC. Ultrasound-guided dextrose injection treatment for chronic myofascial pain syndrome: A retrospective case series. Journal of the Chinese Medical Association. 2020;83(9):876-879. doi:10.1097/JCMA.0000000000000339
2. Lai YC, Tsai SH, Chiou HJ. Ultrasound-guided dextrose solution perimysium dissection for posterior shoulder myofascial pain. Journal of the Chinese Medical Association. 2021;84(6):650-654. doi:10.1097/JCMA.0000000000000541
Medical Disclaimer: This content is for educational purposes only and does not substitute for the medical advice of a physician. Always consult your healthcare provider before beginning any new treatment program. The information presented reflects the opinion of Dr. Jeffrey Peng and does not represent the views of his employers or affiliated hospital systems.
