Exercises, mobilization and manipulation are no doubt effective mean of treating musculoskeletal disorders but they are only one of the possible mean of treating the musculoskeletal problems. Clinicians having expertise in them are no doubt very enthusiastic in emphasizing their ways of treating them. But other aspects of dealing with musculoskeletal problem should also not be ignored or suppressed.
Here are some evidence based studies showing the efficacy of electrotherapy. But here also remember that electrotherapy is one of the possible way or mean of treating the disorders along with other means included in the management plan of the problem.
Efficacy of the Transcutaneous Electrical Nerve Stimulation for the Treatment of Chronic Low Back Pain: A Meta-Analysis.
Clinical effectiveness of commonly used electrotherapy modalities page 21
National practice guidelines for physical therapy in
patients with low back pain
Evidence In Practice -Is low-level laser therapy effective in the management of lateral epicondylitis?
Evidence for the treatment of shoulder disorders with physiotherapy modalities
Electrotherapy for neck disorders
Electrical stimulation for Pain
Self care techniques for acute episodes of Low back pain