Yes, you can have an MRI with most hip replacements, but you must tell the MRI technician beforehand

Most modern hip replacements are MRI-safe, meaning the magnetic field used in an MRI scanner will not damage them or cause them to move. However, some older implants and certain materials are not safe in an MRI machine. The critical step is telling the MRI facility about your hip replacement before you arrive — ideally when you schedule the appointment. The facility will need to know the exact type and brand of your implant to clear you for the scan.

If you do not have documentation of your implant, your surgeon's office can provide it. Many people receive an implant card at discharge that lists the manufacturer and model number. If you cannot find that card, call the surgeon or the hospital where you had the replacement and ask for your operative report or implant information sheet.

Key Takeaways

  • Most hip replacements manufactured in the last 15 years are MRI-safe, but the MRI facility must verify your specific implant before scheduling.
  • You need the exact brand and model of your hip replacement — your surgeon's office can provide this from your operative report if you have lost your implant card.
  • Always disclose your hip replacement when scheduling an MRI, not when you arrive at the facility.
  • Some older implants and certain materials like cobalt-chromium may require a different type of imaging, such as CT scan or ultrasound.

Why the MRI facility needs to know your implant details

MRI machines use a powerful magnetic field to create images of soft tissue inside your body. That magnetic field can interact with metal in unpredictable ways. With a hip replacement, the concern is not usually that the implant will be pulled out of your body — modern implants are firmly attached to bone — but that the magnetic field could heat the metal or cause it to move slightly, damaging surrounding tissue or causing pain.

Different manufacturers use different materials and designs. Some implants are made entirely of non-magnetic materials like ceramic or plastic. Others contain metals that are non-magnetic but still conduct electricity, which can cause heating. A few older implants contain ferromagnetic metals that respond strongly to magnetic fields. The MRI facility has access to databases listing which implants are safe at standard MRI field strengths (usually 1.5 or 3 Tesla) and which are not.

What happens if your implant is not MRI-safe

If your hip replacement is not cleared for MRI, the facility will not perform the scan. This is not a permanent barrier — it means you will need a different imaging method. Your doctor can order a CT scan instead, which uses X-rays rather than magnetic fields and works with any implant. CT scans are very good at showing bone and can detect many of the same problems an MRI would. Ultrasound is another option for some conditions, though it has limitations.

If your implant is very old and you do not have documentation, the MRI facility may ask you to get an X-ray of the hip first. The X-ray can sometimes help identify the implant type, though not always. In that case, your surgeon may need to review your old medical records or contact the hospital where you had the surgery.

How to prepare for an MRI with a hip replacement

When you call to schedule the MRI, tell the scheduler that you have a hip replacement. They will ask for the manufacturer and model number. Have your implant card or operative report ready. If you do not have either, ask if you can call back once you have obtained the information from your surgeon's office — do not guess or give incomplete information.

On the day of your appointment, arrive early and bring any documentation you have. Tell the MRI technician again that you have a hip replacement, even though you already told the scheduler. The technician will review your implant information and may ask you additional questions about when you had the surgery and whether you have had any problems with the implant since then.

Wear comfortable, metal-free clothing. Remove all metal objects — jewelry, watches, glasses, hearing aids, and anything else with metal — before entering the MRI room. Metal objects can interfere with the scan or become dangerous in the magnetic field.

What to expect during the scan

An MRI scan takes 30 to 60 minutes depending on what area is being imaged and how many images the radiologist needs. You will lie still on a table that slides into a tube-shaped machine. The machine makes loud knocking and buzzing sounds — this is normal. You can ask for earplugs or headphones to reduce the noise.

If you have a hip replacement, the scan may take slightly longer because the technician may need to use special techniques to reduce artifacts — blurry areas caused by the metal in the implant. This does not mean anything is wrong; it is just part of the standard process. The technician can see and hear you the whole time and will stop the scan if you need them to.

Implants that are usually safe versus those that may not be

Most hip replacements from major manufacturers like Stryker, Zimmer Biomet, DePuy Synthes, and Smith & Nephew are MRI-safe at standard field strengths. Implants made primarily of titanium, cobalt-chromium alloys, or ceramic are generally safe. Implants from the 1990s and early 2000s are often safe, though documentation may be harder to find.

Older implants, especially those from the 1980s or earlier, may not be MRI-safe. Some custom or experimental implants may also have restrictions. If your implant is from a smaller or now-defunct manufacturer, the MRI facility may not have information about it in their database. In that case, your surgeon may be able to contact the manufacturer directly or provide a letter stating whether the implant is safe.

What to do if you cannot find your implant information

Start by calling the surgeon's office where you had the replacement. Ask for your operative report or implant information sheet. These documents are part of your medical record and the office is required to provide them, usually within a few business days. If the surgeon has retired or the practice has closed, contact the hospital where the surgery took place and ask for your discharge summary.

If you had the surgery many years ago and records are not easily available, ask the MRI facility whether they can proceed with a CT scan instead while you track down the information. Do not delay medical imaging you need while searching for documentation — a CT scan is a safe alternative that can answer most of the same questions.

Frequently Asked Questions

Will the MRI damage my hip replacement?

No, if your implant is cleared as MRI-safe. The MRI facility will not perform the scan unless they have confirmed your specific implant is safe at the field strength they use. The risk of damage is very low with modern implants.

Can I have an MRI of my hip if I have a replacement?

Yes, in most cases. The MRI can image the soft tissue around the implant — muscles, tendons, and cartilage — though the metal in the implant itself will show up as a dark area. This is usually enough for your doctor to see what they need to see.

What if I did not tell the MRI facility about my hip replacement?

Tell them as soon as you remember, even if you are already at the facility. The technician will not proceed with the scan until they have verified your implant information. It is better to delay the scan than to risk an unsafe MRI.

How long does it take to get cleared for an MRI with a hip replacement?

If you have your implant information ready, the facility can usually clear you within a few minutes. If you need to obtain documentation from your surgeon, allow a few business days. Plan ahead when scheduling your MRI.

Is a CT scan as good as an MRI if I cannot have an MRI?

A CT scan is very good at showing bone and can detect fractures, loosening, and some soft tissue problems. It is not quite as detailed for soft tissue like muscles and tendons, but it is a reliable alternative and works with any implant.