OBJECTIVE: The aim of this study was to compare the therapeutic efficacy of high-power pain threshold (HPPT) ultrasound therapy applied to the trigger points and dry needling (DN) in myofascial pain syndrome. DESIGN: Sixty-one patients were randomly assigned to an HPPT (n = 30) and dry needling (n = 31) groups. The primary outcome measures were the visual analog scale (VAS) and Neck Pain and Disability Scale (NPDS), both at 1 week and 4 weeks after treatment. The secondary outcome measures were the number of painful trigger points, range of the tragus-acromioclavicular joint, the Short Form-36, the Beck Depression Inventory, the Beck Anxiety Inventory, and sonoelastographic tests after a 1-week treatment. RESULTS: More improvement was seen in anxiety in the HPPT group (p < 0.05). However, no significant differences were found between the groups with regard to other parameters (p > 0.05). A decrease in tissue stiffness was only seen in the HPPT group (p < 0.05). Significant posttreatment improvements were seen on all clinical scales in both groups (p < 0.05). After a treatment period of 4 weeks, a significant improvement was also observed on the visual analog scale and NPDS (p < 0.05). CONCLUSIONS: Our study favors the efficacy of both treatment methods in myofascial pain syndrome. Although a significant decrease was shown in tissue stiffness with HPPT, neither of these treatments had an apparent superiority.

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