We cannot make any definite statements on the efficacy and clinical usefulness of electrotherapy modalities for neck pain. Since the quality of evidence is low or very low, we are uncertain about the estimate of the effect. Further research is very likely to change both the estimate of effect and our confidence in the results. Current evidence for PEMF, rMS, and TENS shows that these modalities might be more effective than placebo but not other interventions. Funding bias should be considered, especially in PEMF studies.  Galvanic current, iontophoresis, electric muscle stimulation(EMS), and static magnetic field did not reduce pain or disability. Future trials on these interventions should have larger patient samples and include more precise standardization and description of all treatment characteristics.
Treatment of acute cervical pain--a comparative group study.
Thirty patients with acute cervical pain were randomized into 3 groups and treated with neck collar, transcutaneous nerve stimulation, or manual therapy. The improvement was rapid in all groups, but the restoration of the cervical mobility was significantly more rapid in the transcutaneous nerve stimulation group. Some of the patients with manual therapy treatment had remarkably quick symptom reduction, although this was not significantly better than the collar alone. It is concluded that transcutaneous nerve stimulation is a valuable pain reducer and gives a more rapid restoration of cervical mobility in acute cervical pain.