Explained
Shortwave Diathermy (SWD)
In short
Shortwave diathermy uses high-frequency electromagnetic energy to heat tissue several centimetres below the skin, deeper than a hot pack reaches. It is used for chronic joint stiffness and muscle spasm, and works best as preparation for movement and exercise.
Shortwave diathermy applies high-frequency electromagnetic waves to produce heat within the tissue itself, rather than conducting heat inwards from the surface. That lets it warm structures several centimetres deep — deeper than a hot pack can reach.
What it is used for
Chronic joint stiffness, muscle spasm, and deep-seated aching in areas such as the hip, lower back and shoulder. Sessions typically last fifteen to twenty minutes.
What it feels like
A comfortable deep warmth. You should feel warmth, never heat that is uncomfortable — the setting is reduced if it becomes so.
The honest position
It provides symptomatic relief and makes tissue more amenable to stretching and movement afterwards. It does not resolve the underlying problem, and it is most useful applied immediately before hands-on treatment and exercise rather than as a standalone session.
When it is avoided
This modality has more contraindications than most, and they matter:
- Any metal implant in the treatment area, including joint replacements and fixation plates
- Pacemakers and implanted electronic devices
- Pregnancy
- Active infection, bleeding, or malignancy in the area
- Areas of impaired sensation, where a burn could go unnoticed
- Contact lenses if treating the head area
We screen for all of these, and we ask specifically about implants before treating.
Is this right for you?
Whether a technique helps depends on your diagnosis. An assessment tells you what will actually work for your problem.
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