Will your new hip or knee set off airport metal detectors?

Modern hip and knee implants are made of titanium and cobalt-chromium alloys — more than enough metal to trigger a walk-through metal detector. Knee replacements alarm almost every time; hip replacements alarm most of the time, depending on the implant and the detector's sensitivity. Smaller hardware such as screws and plates from fracture surgery may or may not register. Whether you alarm on a given day depends on the amount of metal, where it sits in your body, and how sensitively that particular detector is tuned — so don't be surprised if you alarm in one airport and walk through quietly in another.

Here is the part that surprises patients: it does not matter. Security officers screen travelers with joint replacements all day, every day — artificial hips and knees are among the most common reasons a detector alarms. The alarm triggers a short, standardized follow-up, usually a handheld wand or a targeted pat-down over the joint, and you are on your way. Plan for an extra minute or two, not an ordeal. And no — the screening equipment cannot damage, loosen, or deactivate your implant in any way.

You do not need documentation to fly with a joint replacement. TSA does not require a card, a doctor's letter, or medical records for internal implants — and no card exempts you from screening. Decades ago, implant ID cards were handed out with the expectation that showing one would wave you through; that has not been true for many years. If an alarm sounds, screening resolves it, paper does not.

Some patients still like carrying a card or a note in their phone for peace of mind, and that is perfectly fine — it just is not necessary at the checkpoint. Where a record of your implant genuinely matters is your medical care: knowing the exact implant you have helps any surgeon who treats you in the future, which is one reason we keep those details on file in our implant surveillance program.

Most standard security lanes now use millimeter-wave body scanners rather than metal detectors. These image the surface of the body, so your implant typically shows up as a highlighted region on the officer's screen over the hip or knee. The resolution is quick: a brief, targeted pat-down of that area, and you are cleared. Many patients find the scanner smoother than the walk-through detector because the officer can see exactly where to check.

One quirk worth knowing: expedited-screening lanes such as TSA PreCheck often use walk-through metal detectors rather than scanners. PreCheck still speeds up the rest of the process — shoes on, laptop stowed — but your implant will still alarm, and you may be redirected to a scanner or given a pat-down. You may also request private screening at any point, and you will never be asked to show your incision or undress at a checkpoint.

The same applies to sensor-equipped implants: a smart knee such as the Persona IQ goes through security exactly like any other joint replacement, and screening equipment does not affect the implant or its electronics.

The whole interaction goes best when you speak up first. Before you step through, tell the officer plainly: "I have a knee replacement on the left" — or wherever your implant is. That single sentence tells them what the alarm means and where to focus, and it turns the screening into a quick, predictable routine.

A little stage direction for the rest: after the alarm, you will usually be asked to step aside for a handheld wand or a brief pat-down over the joint. You stay clothed, the officer explains each step, and the whole thing typically takes well under a minute. Many patients feel a flicker of self-consciousness on the first trip after surgery — that fades fast once you see how unremarkable the routine is to the people running it. If standing in place is uncomfortable early in recovery, say so; you can ask for a chair or additional assistance during screening.

Screening procedures vary by country, but the pattern is the same worldwide: the detector alarms, you point to your hip or knee and say "joint replacement," and a quick secondary check resolves it. If you are traveling somewhere you do not speak the language, a translated phrase or a picture on your phone works fine. Allow extra time, stay relaxed, and remember that implants are just as common everywhere else as they are here. On multi-leg trips, expect to repeat the routine at every checkpoint — connecting through an international hub means going through screening again, so build the extra minutes into your connection rather than your stress level. If walking long terminal distances is still hard early in recovery, wheelchair or cart assistance can be arranged when you book; there is no prize for limping through an airport.

For patients across the islands, the same routine applies to interisland travel — many of Dr. Morton's patients fly between Honolulu and the neighbor islands for surgery and follow-up without a hitch. If you are considering traveling to Honolulu for surgery, our destination joint replacement program covers the whole journey, including when it is safe to fly home. And if you are still weighing surgery itself, that conversation starts with an orthopedic consultation.