Effectiveness of PRP Pharmacopuncture for Chronic Neck Pain in Cervical Myofascial Syndrome of the Upper Trapezius

Participants in the PRP pharmacopuncture arm will receive a single administration of platelet-rich plasma (PRP) via intramuscular injection at acupuncture points corresponding to chronic neck pain in cervical myofascial syndrome in the upper trapezius muscle.

Participants in the placebo pharmacopuncture arm will receive a single administration of normal saline via intramuscular injection at acupuncture points corresponding to chronic neck pain in cervical myofascial syndrome in the upper trapezius muscle.