Objective. Pulsed electromagnetic fields (PEMF) have shown therapeutic benefit in painful osteoarthritis, osteonecrosis, osteoporosis, and wound healing. The aim of this study was to evaluate the effects of pulsed electromagnetic fields in the treatment of patients with osteoarthritis or anterior disk displacement without reduction, who suffered from pain in the temporomandibular joint (TMJ) and/or limited jaw mobility. Methods. A randomized, double blinded trial of 9 one-hour active PEMF treatment vs. placebo treatment in a total of 23 patients (18 women, 5 men, 18-84 years range of age, mean age 42.82 ± 15 years) with craniomandibular disorders (CMD) was conducted. Subjective data were evaluated using visual analog scale (VAS), objective data were recorded by calibrated examiners before treatment (baseline), directly after the 9th treatment, 6 weeks and 4 months after completion of treatment. Results. Matched pair Wilcoxon-test showed significant changes between baseline and four months follow-up observation regarding the subjective data pain intensity, pain frequency, and active mouth opening for all patients regardeless of the treatment. Changes from baseline to 4 months follow-up included: pain intensity from 54% to 33% of VAS (p=0.001), frequency of pain from 53% to 29% of VAS (p=0.001), extend of maximal mouth opening from 39mm to 42mm (p=0.01). Significant differences were found between active PEMF treatment vs. placebo treatment regarding pain intensity (p=0.003) and pain frequency (p=0.005). Patients of the placebo group claimed greater pain reduction than those of the active treatment group. Conclusion. Since no specific PEMF related therapeutical effect could be detected in patients with osteoarthritis or anterior disk displacement without reduction, it cannot be recommended as a treatment option for patients with such diagnoses.

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