Electrotherapy can be used to provide pain relief in a range of conditions including osteoarthritis. Although Transcutaneous Electrical Nerve Stimulation (TENS) was recommended as an intervention to consider in NICE Osteoarthritis guideline CG177 it is not thought to be widely used within the NHS. TENS is available over the counter, however, so may be recommended by NHS healthcare professionals. Reviewing and updating the evidence again may help determine whether electrotherapy should be recommended as part of NHS treatment.