Low intensity pulsed Ultrasound therapy versus dry needling for inactivation of myofascial trigger points: Randomized Clinical Study

Abstract

Objectives: This study aims to compare between the effect of low intensity pulsed ultrasound (US) therapy and dry needling in the treatment of myofascial pain syndrome. Patients and methods: Twenty patients with myofascial pain syndrome were included in this prospective, comparative study. Patients were randomized into two groups as US group (n=10) and dry needle group (n=10). Low intensity pulsed ultrasound was applied 3 times per week for 5 minutes in each session for 4 weeks in the US group. Each trigger point exposed to 12 sessions over 4 weeks. In dry needle group ,3 treatment sessions a week for 4 weeks; each session took 50 seconds. Treatment effectiveness was evaluated with Visual Analog Scale (VAS), pain pressure threshold using algometer, and maximum interincisal opening (MIO). These parameters in both groups were evaluated at baseline, 2 weeks, and 3 months postoperative. Results: The treatment results demonstrated insignificant difference between both groups regarding VAS throughout the study. Pain Pressure Threshold of dry needle group was significantly higher than ultrasound group at base line and 2 weeks postoperative. MIO in ultrasound group was significantly higher than dry needle group after 3 months postoperative. Conclusion: In myofascial pain syndrome, the effect of low intensity pulsed ultrasound and dry needle are the same in reducing pain at rest. Both treatments elevate pain pressure threshold after 3 months, and ultrasound improved maximum mouth opening better than dry needle after 3 months.