This therapy has been used to treat pain and edema in soft tissue for over 60 years. The technology stemmed from radio frequency (RF) diathermy, which utilized a continuous electromagnetic field to produce heat in soft tissue.
A moving – or resonating – magnetic field can create currents without heating and thus directly alter cellular signaling. It has been firmly established that tissues including blood, muscle, ligaments, bone and cartilage respond to biophysical input, including electrical and electromagnetic fields. New studies show that with the proper field intensity and frequency, treatment with PEMF appears to be disease-modifying. The stimulation of TGFβ may be a mechanism by which PEMF favorably affects cartilage homeostasis. Through calcium-calmodulin-dependent pathways, PEMF may also increase nitric oxide activity.
Also on the show, family physician Dr. William Pawluk discussed the OrthoCor Active Knee System. This is an FDA-approved device that combines PEMF energy and thermal therapy to increase circulation and thus reduce swelling, relieve chronic pain and arthritis, as well as improve range of motion. The device’s technology consists of a cuff that surrounds the knee. It has a coil and heat pods that send magnetic pulses and heat through the injured tissue. Patients can walk while the OrthoCor device is in operation. OrthoCor sells its products through orthopedic clinics, physicians and health care practitioners.
Dr. Pawluk also introduced a small, disposable PEMF device called Acti-Patch by Bioelectronics Corp. In Canada, ActiPatch is a Class II device and is sold over-the-counter. Health Canada has approved it for relief of musculoskeletal pain. It is not FDA-approved for musculoskeletal pain, so the efficacy of these patches is still unclear. It may have some benefit with superficial pain and edema.
1. Markov MS. Expanding use of pulsed electromagnetic field therapies. Electromagn Biol Med. 2007;26(3):257-74.
2. Nelson F, et al., The use of a specific pulsed electromagnetic field (PEMF) in treating early knee osteoarthritis. Trans 56th Annual Orthopaedic Research Society Meeting, New Orleans, LA (2010), p. 1034.
3. Pilla, et al., Electromagnetic fields as first messenger in biological signaling: Application to calmodulin-dependent signaling in tissue repair, Biochim. Biophys. Acta (2011), 2011 Oct 8;1810(12):1236-1245.
4. Rosch P, et al., Bioelectromagnetic medicine. New York: Marcel Dekker, 2004.
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