OBJECTIVE: To examine whether the addition of either electroacupuncture or interferential electrotherapy to shoulder exercises would be more effective in the management of frozen shoulder. DESIGN: A double-blinded, randomized, controlled trial. METHODS: A total of 70 subjects were randomly allocated to receive either: (i) electroacupuncture plus exercise; (ii) interferential electrotherapy plus exercise; or (iii) no treatment (the control group). Subjects in groups (i) and (ii) received 10 sessions of the respective treatment, while the control group received no treatment for 4 weeks. Each subject's score on the Constant Murley Assessment and visual analogue scale were recorded at baseline, post-treatment session and subsequent follow-up sessions. RESULTS: In both the electroacupuncture and interferential electrotherapy groups, the Constant Murley Assessment score increased and the visual analogue scale score decreased significantly (both p < 0.001). No significant change was found in any outcome of the control group, and no significant difference was found between the 2 intervention groups (all p > 0.05). The observed improvement was well maintained in both intervention groups at least until the 6-month follow-up session. CONCLUSION: Either electroacupuncture or interferential electrotherapy in combination with shoulder exercises is effective in treating frozen shoulder patients. However, no significant difference was found between these types of treatment.

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