Metal Implants, Plates and Joint Replacements — During Radiation Therapy

Yes. A metal implant is not a reason to be refused radiation therapy. Hip and knee replacements, spinal rods, plates, screws, dental implants and surgical clips are all common in people who need radiotherapy, and treatment teams plan around them every week. The implant does change how the beam travels through you, so your radiation oncologist and medical physicist adjust the plan — different beam angles, a planning CT reconstructed to reduce metal streaks, and a corrected density value for the metal itself. What does not change is your eligibility. Tell your team about every piece of metal in your body before your planning scan, and bring the operation note or implant card if you have one.

No. Metal implants do not heat up, spark, melt or burn during radiation therapy. Radiotherapy uses high-energy X-ray beams, and those beams pass through metal without warming it in any way you could feel. The heating warning you may have read about belongs to MRI scanning, which uses strong magnets and radiofrequency energy — completely different physics. You will feel nothing at all from the beam during a session, over an implant or anywhere else. If the skin above your implant sits inside the treatment field it can become sore or pink like any treated skin, but that is a normal skin reaction to the dose, not the metal getting hot.

Yes, and both effects are expected and corrected. Dense metal absorbs more radiation than tissue, so it casts a partial shadow beyond it, and it scatters a little extra dose back into the tissue immediately in front of it. Neither effect is a surprise to your team. Medical physicists measure and model these changes before a single beam is switched on, and professional guidance on planning radiotherapy around metal prostheses has existed for years. The usual fix is simple: choose beam angles that do not pass through the metal at all. Modern planning techniques give many angles to work with, so the target still receives its planned dose.

The plan changes; your eligibility does not. If you are having pelvic radiotherapy with one or both hips replaced, your planning CT is reconstructed using metal-artefact reduction so the anatomy near the prosthesis stays visible. The physicist then assigns a corrected density to the metal, because standard CT numbers do not extend that far. Finally, beam angles that would fire straight through the prosthesis are excluded from the plan. The result is a plan built for your anatomy, intended to deliver the planned dose to the target while sparing healthy tissue. Your radiotherapy is delivered at an NABH-accredited partner centre; CION Cancer Clinics coordinates your plan, your oncology team and your care throughout.

No. External beam radiation therapy leaves nothing radioactive behind — not in your tissue and not in your implant. The beam stops the instant the machine is switched off, in the same way a room goes dark when a bulb is switched off. You can hold your grandchild, sleep beside your partner and share a meal on the evening of every session. The only radiotherapy treatments that involve genuine radioactivity are permanent seed implants and radioiodine therapy, and even then the radioactivity comes from the treatment itself, never from your plate, screw or joint replacement.

They need a specific plan, and that is why dental review comes before radiotherapy for head and neck cancers. Metal in the mouth scatters a small amount of extra dose back into the soft tissue touching it, which can make mouth soreness worse in that exact spot. The standard answer is not to remove sound implants. Your team may make a custom mouth spacer or stent that holds the cheek and tongue slightly away from the metal during each session, and your dentist may treat any active decay first. Follow the written mouth-care routine your team gives you, and tell them early if soreness is building faster on one side.