BACKGROUND: Hyperthermia has been introduced as a physical therapy modality for soft tissue injuries. HYPOTHESIS: The authors tested the null hypothesis that there are no short-term differences after the use of hyperthermia, ultrasound, and exercises for tendinopathy of the supraspinatus tendon. STUDY DESIGN: Randomized controlled trial; level of evidence, 1. METHODS: The authors studied 37 athletes (29 men, 8 women; mean age 26.7 +/- 5.8 years; range 19 to 43 years) with supraspinatus tendinopathy who had had symptoms between 3 and 6 months. Subjects were randomly assigned to 3 groups. Group A (n = 14) received hyperthermia at 434 MHz. Group B (n = 12) received continuous ultrasound at 1 MHz at an intensity of 2.0 w/cm(2) 3 times a week. Group C (n = 11) undertook exercises, consisting of pendular swinging and stretching exercises 5 minutes twice a day every day. All interventions were undertaken for 4 weeks. Subjects were evaluated at baseline, immediately on completion of treatment, and at 6 weeks after the end of the intervention using mean pain score for pain at night, during movement, and at rest on a visual analog scale; pain on resisted movement and painful arc on active abduction between 40 degrees and 120 degrees on a 4-point scale; and Constant score. RESULTS: Patients who received hyperthermia experienced significantly better pain relief than did patients receiving ultrasound or exercises: group A, 5.96 to 1.2 (p = 0.03); group B, 6.3 to 5.15 (p = 0.10); group C, 6.1 to 4.9 (p = 0.09). CONCLUSION: Hyperthermia at 434 MHz appears safe and effective in the short term for the management of supraspinatus tendinopathy.

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