Trigger Point Injection for Myofascial Pain Syndrome of the Low Back: A Partially Blinded Three-Arm Randomized...

Area of Science:

• Emergency Medicine
• Pain Management
• Musculoskeletal Conditions

Background:

• Low back pain is a frequent emergency department complaint, often linked to myofascial pain syndrome.
• Trigger point injections (TPIs) show efficacy for various pain conditions, but evidence for myofascial low back pain, especially functional outcomes, is limited.

Purpose of the Study:

• To compare the efficacy of TPIs plus standard therapy versus standard therapy alone for treating low back pain.
• To evaluate both pain reduction and functional outcomes in patients receiving TPIs.

Main Methods:

• A partially blinded, 3-arm randomized controlled trial involving 180 adults with low back pain and trigger points.
• Participants received either standard therapy alone or TPIs (bupivacaine or normal saline) with standard therapy.
• Primary outcome: pain change on a visual analog scale (VAS) at 30-60 minutes; Secondary outcomes: functional changes via Modified Oswestry Disability Index (MODI).

Main Results:

• All groups showed pain reduction at 30 minutes.
• No statistically significant difference in pain reduction or functional improvement was observed between TPIs (bupivacaine or saline) and standard therapy alone at 30-60 minutes or 60-72 hours.
• No serious adverse events were reported.

Conclusions:

• Trigger point injections provided no additional benefit over standard therapy alone for managing low back pain in the emergency department setting.
• Further research may be needed to explore alternative or adjunct treatments for myofascial low back pain.