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A double-blind clinical trial of low power pulsed shortwave therapy in the treatment of a soft tissue injury
Barker AT, Barlow PS, Porter J, Smith ME, Clifton S, Andrews L, O'Dowd WJ
Physiotherapy 1985 Dec;71(12):500-504
clinical trial
8/10 [Eligibility criteria: Yes; Random allocation: Yes; Concealed allocation: Yes; Baseline comparability: Yes; Blind subjects: Yes; Blind therapists: Yes; Blind assessors: No; Adequate follow-up: Yes; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

This paper describes the methodology and results of a double-blind trial to assess the efficacy of a commercial low power pulsed shortwave therapy machine in the treatment of lateral ligament sprains of the ankle. A total of 73 patients were randomly allocated to one of two groups and received treatment with a machine which was either functioning normally or was disabled. Their progress was assessed by means of goniometry, volumetric measurements, subjective pain sources and gait analysis. No difference between the two groups due to treatment with active as opposed to disabled machines was detected. The authors conclude by questioning whether such machines should be marketed without sound evidence of efficacy.

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