Can You Use Red Light Therapy With Metal Implants, Joint Replacements, or a Pacemaker?

Short answer: red light therapy is generally considered safe to use if you have metal implants, joint replacements, plates, or screws — light does not heat metal the way diathermy or an MRI does. Implanted electronic devices like a pacemaker, defibrillator, or medication pump are a different story: don't treat directly over the device, and ask your cardiologist first.

This question comes up constantly, and for good reason. If you've had a knee replaced or a wrist plated back together, you've probably been handed a list of things to avoid — MRI precautions, airport security cards, "tell your dentist about the hardware." It's reasonable to wonder whether a red light panel belongs on that list too.

Here's the honest version, plus how to use a device sensibly if you do have hardware.

Does red light therapy interfere with metal implants?

No — and the reason is worth understanding, because it clears up most of the confusion.

The therapies that carry real metal-implant warnings are ones that induce heat or current in metal: shortwave diathermy, microwave diathermy, and MRI. Those use electromagnetic energy at frequencies that metal readily absorbs, which can heat the implant or shift it. That's why your surgeon gave you a card.

Red and near-infrared light works differently. It's visible and near-visible light in the 600–900nm range, and it's absorbed by cells in your skin and the tissue just beneath it — the working depth is measured in millimeters to a couple of centimeters, not inches. A titanium knee component sitting several centimeters down simply isn't receiving meaningful light. The light is doing its work in the skin, fascia, and superficial muscle above the hardware.

Put plainly: a red light panel is closer in category to sitting in front of a bright lamp than to an MRI magnet.

Is red light therapy safe after a knee or hip replacement?

Once your incision has healed and your surgeon has cleared you for normal activity, most people can use a red light device over a replaced joint without issue. Some of the more interesting research in this space has actually been done on joint replacement patients.

A three-arm randomized trial published in Arthroplasty Today compared low-level laser therapy and light therapy against a control group after total knee replacement, and reported better range of motion and less swelling in the light-treated groups at several follow-up points. A separate randomized clinical trial looking at photobiomodulation after knee arthroplasty reported reduced swelling markers and better early walking distance in the treated group.

These were clinic-administered protocols, not at-home consumer devices, and the trials were small. So the fair reading is: light exposure over surgical hardware was well tolerated in these settings and researchers found it worth studying further — not that a home device replicates a supervised post-op protocol. Talk to your surgeon or physical therapist about timing, especially in the first few weeks after surgery when the incision is still closing.

What about a pacemaker, defibrillator, or implanted pump?

This is the one place to be genuinely cautious. Implanted electronic devices — pacemakers, ICDs, insulin pumps, neurostimulators — are a different category from inert metal hardware, because they contain circuitry and a battery.

The practical guidance most manufacturers and clinicians give is straightforward: don't apply a light therapy device directly over an implanted electronic device, and check with the cardiologist or specialist who manages it before starting. That isn't because there's a documented pattern of LED light disrupting pacemakers — the concern is mostly about local heat near the device pocket and the general principle of not aiming energy at implanted electronics.

Using a device on your knee or foot when your pacemaker is in your chest is a very different question from shining a panel at your upper chest. Bring it up at your next appointment; it's a quick conversation.

What about dental implants, plates, screws, and rods?

Same logic as joint replacements. Titanium dental implants, spinal rods, ankle plates, and fixation screws are inert metal — they don't respond to red or near-infrared light the way they respond to an MRI field. Light therapy is actually used routinely in dental settings for post-procedure comfort.

The one caveat that applies to everyone, hardware or not: don't use a device over an area with an active infection, an open surgical wound, or a suspicious skin lesion without asking a clinician first.

Which AWA device makes sense if you have hardware?

Match the device to where the hardware is, not to the hardware itself:

• Replaced or plated knee, shoulder, elbow, or lower back — the Red Light Therapy Belt ($119.99) wraps around the joint so the LEDs stay in contact while you sit or move around.
• Hip hardware, or several areas at once — a panel gives you broader coverage. The FX300 ($199.99) is the compact, targeted option; the FX500 ($269.99) is the full-body flagship if you're treating hips, back, and shoulders in the same session.
• Wrist, ankle, or hand plates and screws — the handheld device ($199.99) with dual 660nm and 850nm output lets you work small areas precisely.
• Fused or pinned feet and toes — the Red Light Therapy Slippers ($199.99) hold the light against the whole foot without you having to hold anything.

You can browse everything in the wearables collection or see the full red light therapy range.

How should you actually use it around hardware?

Nothing exotic — the same sensible approach that applies to anyone:

1. Start short. Ten minutes per area, three to five times a week, is a reasonable starting point. More is not better. Researchers describe photobiomodulation as having a biphasic dose response — a moderate dose tends to outperform a very large one.
2. Skin contact or close range. Wearables sit against you; with a panel, follow the distance guidance that came with it.
3. Watch the skin, not the metal. If an area gets warm, pink, or uncomfortable, shorten the session. Scarred skin over hardware can be more sensitive than the skin around it.
4. Give it weeks, not days. Most people who notice a difference in stiffness or soreness describe it building over three to six weeks of consistent use.

When should you skip it and call your doctor?

Ask first if you have an implanted electronic device, if you're within the early post-surgical window, if the joint is red, hot, or swelling in a new way (that can signal infection around hardware and needs attention, not light), or if you're on a medication that increases light sensitivity. We wrote more about that last one in our guide to red light therapy and photosensitizing medications.

Frequently asked questions

Can red light therapy heat up or move a metal implant?

No. Red and near-infrared light doesn't induce current or meaningful heat in metal, and it doesn't penetrate deeply enough to reach an implant sitting centimeters below the skin. The warmth you feel is at the skin surface.

Do I need to tell my surgeon I'm using red light therapy?

It's worth mentioning, especially if you're still in active rehab. Your surgeon or physical therapist may have an opinion on timing relative to your recovery plan, and they know your specific hardware.

Is it safe to use red light therapy over a surgical scar?

Once the incision is fully closed and healed, yes — scar tissue is a common area people target. While the wound is still healing, ask your surgical team first.

Can I use red light therapy if I have a pacemaker but the pain is in my knee?

Treating a body area far from the device is a much lower-concern scenario than treating over the chest, but this is still a question for your cardiologist rather than one to settle from an article.

Are these devices FSA or HSA eligible?

Yes — AWA's red light therapy devices are FSA/HSA eligible, and you can pay with your benefits card at checkout. Our step-by-step guide to using an FSA or HSA walks through how it works, and you can browse the FSA/HSA eligible collection.

Does hardware make red light therapy less effective?

Not in any way that's been demonstrated. The light is working in the tissue above the implant — the muscle, fascia, and skin that are usually the source of post-surgical stiffness and soreness anyway.

Having hardware in your body doesn't put red light therapy off-limits. It just means being thoughtful about where you point it and, if there's electronics involved, making one phone call before you start.

Lights on, pain off.

This article is for general education and is not medical advice. Red light therapy devices are intended for general wellness and are not intended to diagnose, treat, cure, or prevent any disease. Always check with a qualified healthcare provider before starting a new therapy.