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Comparison of High-Power Pain Threshold Ultrasound Therapy With Local Injection in the Treatment of Active Myofascial Trigger Points of the Upper Trapezius Muscle

      Abstract

      Unalan H, Majlesi J, Aydin FY, Palamar D. Comparison of high-power pain threshold ultrasound therapy with local ınjection in the treatment of active myofascial trigger points of the upper trapezius muscle.

      Objective

      To compare the effects of high-power pain threshold ultrasound (HPPTUS) therapy and local anesthetic injection on pain and active cervical lateral bending in patients with active myofascial trigger points (MTrPs) of the upper trapezius muscle.

      Design

      Randomized single-blinded controlled trial.

      Setting

      Physical medicine and rehabilitation department of university hospital.

      Participants

      Subjects (N=49) who had active MTrPs of the upper trapezius muscle.

      Interventions

      HPPTUS or trigger point injection (TrP).

      Main Outcome Measures

      Visual analog scale, range of motion (ROM) of the cervical spine, and total length of treatments.

      Results

      All patients in both groups improved significantly in terms of pain and ROM, but there was no statistically significant difference between groups. Mean numbers of therapy sessions were 1 and 1.5 in the local injection and HPPTUS groups, respectively.

      Conclusions

      We failed to show differences between the HPPTUS technique and TrP injection in the treatment of active MTrPs of the upper trapezius muscle. The HPPTUS technique can be used as an effective alternative to TrP injection in the treatment of myofascial pain syndrome.

      Key Words

      List of Abbreviations:

      CI (confidence interval), HPPTUS (high-power pain threshold ultrasound), ITT (intention to treat), LTR (local twitch response), MPS (myofascial pain syndrome), MTrP (myofascial trigger point), NSAID (nonsteroidal anti-inflammatory drug), PPT (pain pressure threshold), RCT (randomized controlled trial), ROM (range of motion), TENS (transcutaneous electrical nerve stimulation), TrP (trigger point), US (ultrasound), VAS (visual analog scale)
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