Diathermy Therapy
Shortwave diathermy uses electromagnetic energy to deliver controlled thermal or nonthermal treatment to a selected area. At Sunridge, it is considered for a specific pain, mobility or rehabilitation goal—not offered as a one-size-fits-all treatment.
Before treatment, the team reviews the diagnosis, location of symptoms, implanted devices, sensation and circulation, prior procedures and the outcome that would make therapy worthwhile.
That is exactly what the first conversation is for. Tell us where the problem is, how long it has been present and what you have tried. We will help determine whether a diathermy evaluation or another Sunridge service makes more sense.
Speak With Our Patient Care Team
Tell us where you feel pain or stiffness, how it affects movement and what you have already tried. We will help you plan the right next step.
- Pain location, diagnosis and prior imaging are reviewed
- Implanted devices and other safety factors are screened
- Questions before scheduling are always welcome
On This Page
What Shortwave Diathermy Is
Shortwave diathermy is a physical-medicine treatment that applies radiofrequency electromagnetic energy through an applicator positioned over or near the body. Depending on the device and settings, treatment may be designed to produce comfortable deep heating or deliver pulsed energy with little perceptible heat.
Thermal treatment
Continuous or higher-average-power delivery can warm deeper tissues. The clinical goal may involve short-term pain relief, reduced stiffness or preparation for movement and rehabilitation.
Pulsed, nonthermal treatment
Lower-average-power pulsed devices are intended to deliver electromagnetic energy without meaningful tissue heating. FDA device classifications describe selected nonthermal systems for pain treatment.
Who May Be a Candidate
Diathermy may be considered when a clinician identifies a musculoskeletal or rehabilitation problem for which a controlled physical modality could support pain relief, movement or participation in a larger care plan.
Joint pain and stiffness
Research most often examines knee osteoarthritis, where diathermy is typically combined with education and exercise rather than used alone.
Persistent soft-tissue discomfort
A clinician may consider local treatment after examining the painful area and excluding injuries or medical problems that need another approach.
Limited movement
When pain or stiffness interferes with rehabilitation, treatment may be timed before guided mobility or strengthening work.
A need for non-drug support
Some patients want a noninvasive option that can be measured by changes in pain, range of motion, activity or function.
Diathermy is not a substitute for diagnosing a fracture, infection, blood clot, progressive neurologic deficit or other urgent cause of pain. If symptoms have changed suddenly, the evaluation comes before the treatment.
What a Diathermy Treatment May Feel Like
Treatment is performed with the patient positioned comfortably and the target area accessible. The applicator is placed according to the device instructions and prescribed treatment area. Thermal protocols may create a mild, comfortable warmth; some pulsed protocols create little or no heat.
- The team confirms the treatment area and completes device-safety screening
- Jewelry or removable metal near the area may need to be removed
- The patient is asked about warmth, discomfort, numbness or unexpected sensations
- Treatment time and settings follow the clinical goal and device instructions
- Response is tracked by pain, mobility, function and tolerance—not by sensation alone
You should be able to communicate with the clinician throughout the session. Report excessive heat, pain, dizziness, tingling or any unusual sensation immediately.
What the Research Shows
Clinical research on shortwave diathermy is mixed and depends on the condition, device settings, comparison treatment and whether exercise is included. A multicenter randomized trial in knee osteoarthritis found that physical-therapy modalities, including shortwave diathermy, could add pain-related benefit within a package that also included exercise and education. Other placebo-controlled research found no clear between-group advantage for pulsed shortwave treatment.
A 2020 randomized placebo-controlled trial also studied shortwave diathermy as an addition to exercise in knee osteoarthritis. More recent comparative research found improvement in several outcomes when shortwave diathermy was paired with exercise, although high-intensity laser performed better on several measures. These results support careful, goal-based use—not a claim that diathermy cures arthritis or replaces movement-based rehabilitation.
Safety, Implanted Devices and When Not to Treat
Shortwave energy can interact dangerously with certain implanted electronic systems. FDA labeling for neurostimulators warns that diathermy can transfer energy through an implanted system, heat tissue near electrodes and cause severe injury—even when the implant is turned off.
Active implanted electronics
Pacemakers, implanted defibrillators, deep-brain stimulators, spinal-cord stimulators, vagus-nerve stimulators and similar systems require strict device-specific review. Some carry an absolute diathermy contraindication.
Metal and prior procedures
Tell the clinician about joint replacements, surgical hardware, clips, pumps, ports and any implanted or retained metal so the exact device instructions can be followed.
Sensation and circulation
Reduced ability to feel heat, impaired circulation or inability to communicate discomfort can increase risk and may change eligibility.
Other medical circumstances
Pregnancy, active infection, bleeding, suspected clot, fever, recent injury and treatment over a tumor or growth require physician review and device-specific guidance.
Safety rules differ between thermal and nonthermal devices. Sunridge screens against the instructions and contraindications for the actual system being used rather than relying on a generic checklist.
How Diathermy May Fit Into a Larger Care Plan
A physical modality is most useful when it helps the patient do something meaningful—walk more comfortably, tolerate therapeutic movement, reduce reliance on rescue measures or return to valued activity.
Clarify the pain generator
History, examination and existing imaging help determine whether the main issue is joint degeneration, muscle, tendon, nerve, instability or another source.
Pair relief with movement
When appropriate, the window after treatment can be used for mobility, strengthening, posture or gradual activity progression.
Compare treatment options
Depending on the diagnosis, Sunridge may discuss red light therapy, Prolozone therapy or other physician-directed care.
Measure the response
Symptoms, range of motion, walking, sleep and daily function help determine whether continued treatment is worthwhile.
Frequently Asked Questions
Is diathermy the same as a heating pad?
No. Shortwave diathermy uses electromagnetic energy and may affect deeper tissues depending on the device and settings. It requires screening and professional application.
Will I feel heat?
Thermal protocols may feel comfortably warm. Some pulsed, low-average-power protocols create little or no heat. Lack of heat does not mean the device is off.
How many treatments will I need?
There is no universal number. Frequency should be based on the diagnosis, goal, response and whether treatment is helping function. The plan should include a reassessment point.
Can I receive diathermy with a pacemaker or neurostimulator?
Do not assume it is safe. Certain implanted electronic systems carry explicit warnings or contraindications for diathermy. Tell Sunridge about every implant before scheduling treatment.
Does diathermy cure arthritis?
No. It may be considered for symptom relief or rehabilitation support in selected patients, but it does not reverse osteoarthritis and should not replace diagnosis, exercise or indicated medical treatment.
Can I call before deciding?
Yes. Call 1-800-923-7878 for an immediate conversation with the Patient Care Team. There is no obligation to schedule.
References
- U.S. Food and Drug Administration. Nonthermal shortwave therapy device classification.
- U.S. Food and Drug Administration. Neurostimulation-system contraindications for diathermy.
- Comparison of TENS, interferential currents and shortwave diathermy in knee osteoarthritis: multicenter randomized controlled trial.
- Pulsed shortwave diathermy for knee osteoarthritis: placebo-controlled double-blind clinical trial.
- Exercise combined with electrophysical modalities in knee osteoarthritis: randomized placebo-controlled trial.
- High-intensity laser and shortwave diathermy with exercise in knee osteoarthritis: randomized comparative study.
- Centers for Medicare & Medicaid Services. Diathermy Treatment National Coverage Determination.
This page is educational and does not replace a medical evaluation. Eligibility and contraindications depend on the diagnosis, treatment area, implanted devices and the instructions for the specific diathermy system.
Ask Whether Diathermy Belongs in Your Treatment Plan
Our Patient Care Team will listen, answer practical questions and help determine what records or imaging may be useful. Call now for an immediate response or use the form at the top of this page.