Travelling Before and After
Hip or Knee Replacement

The Short Answer

Hip and knee replacement surgery, like any major lower-limb operation, temporarily increases your risk of developing a blood clot in the leg — known as a deep vein thrombosis, or DVT. Long flights independently increase that same risk. Combining the two too closely is what surgeons most want patients to avoid.

Why Travel and Joint Surgery Don't Mix Easily

Three things happen when you sit still for several hours on a plane. Blood flow in the legs slows. Cabin air is dry, which thickens the blood. And the cramped seating position kinks the veins behind the knee. Together, these create the conditions for a blood clot to form in the deep veins of the leg.

In a healthy person, the absolute risk on any single flight is small — perhaps 1 in 1,000 for a flight over four hours. But after major orthopaedic surgery, the body's clotting system is already activated as part of the natural healing response. Adding a long flight on top of that compounds the risk significantly. This is why anchoring the timing of travel around your surgery date matters more than most patients realise.

Travelling Before Your Operation

This is the half of the question that is often overlooked. Patients tend to assume that the risks lie entirely on the post-operative side — but the evidence suggests otherwise.

Recent research has shown that patients who travel by air shortly before lower-limb joint replacement have an increased risk of developing a blood clot afterwards — even when the flight itself is relatively short. One study found the risk of post-operative venous thromboembolism was nearly three times higher in patients who flew to hospital, compared with those who travelled by land. The likely explanation is that the pre-operative flight starts the clotting process, and the surgery then amplifies it.

For this reason, Mr Hussain advises against any long-haul flight (more than four hours) within four weeks of your scheduled surgery date. This advice aligns with that of the Royal Orthopaedic Hospital, where many of his patients are operated on.

If you must travel before surgery

If a long-haul trip is unavoidable in the run-up to your operation, the same in-flight precautions used by post-operative patients apply:

• Wear properly fitted compression (flight) socks throughout the journey
• Walk the cabin at least once an hour and perform regular ankle pumps in your seat
• Drink water frequently; avoid alcohol and caffeine
• Keep your legs uncrossed and your clothing loose
• Tell Mr Hussain about your travel plans so any individual risk factors can be considered

Travelling After Your Operation

The early post-operative period carries the highest risk of clot formation. To protect against this, all hip and knee replacement patients are prescribed a course of anticoagulation — usually aspirin, a low-molecular-weight heparin, or a direct oral anticoagulant such as rivaroxaban.

This explains why even the earliest "safe to fly" advice tends to start at around four weeks post-operatively — by that point, most patients have completed their thromboprophylaxis course and the highest-risk window has passed.

Beyond four weeks, the timing depends on the individual patient. Mr Hussain typically recommends waiting between four weeks and three months before a long-haul flight, with the exact timing decided according to:

• How well your wound has healed
• How mobile you are and how comfortably you can walk through an airport
• Your overall fitness and any other medical conditions
• Whether you have a personal or family history of clotting
• The duration and complexity of the trip

Shorter post-operative journeys

Driving short distances is usually possible from around four to six weeks after surgery, once you can sit comfortably, react quickly enough to brake in an emergency, and are no longer taking strong painkillers. Long car journeys carry the same DVT considerations as flights — the same precautions apply: regular breaks, hydration, leg movement.

Practical Checklist for Any Long Journey

Whether you are travelling before or after your operation, the same fundamentals reduce your risk of complications:

• Tell Mr Hussain about your travel plans before booking
• Wear well-fitted compression socks for the duration of the journey
• Walk around at least once an hour, or do ankle pumps in your seat if you cannot stand
• Drink water steadily; avoid alcohol
• Keep clothing loose and avoid crossing your legs for long periods
• Inform your travel insurer about your recent or upcoming surgery
• Carry a copy of your operation note or implant card if travelling internationally
• Look up the nearest hospital at your destination — peace of mind costs nothing

Will My New Joint Set Off Airport Metal Detectors?

Almost certainly, yes. Modern hip and knee implants contain enough metal — typically titanium, cobalt-chrome, or stainless steel — to trigger most airport security scanners.

This is not a problem in practice. Joint replacements are now so common that airport security staff handle this dozens of times a day. You will be asked to step aside, a hand-held wand will be passed over the area, and you will be on your way within a minute or two. There is no longer any need for a doctor's letter or implant card for security purposes — although carrying details of your implant is still useful for medical reasons.

Speak to Mr Hussain About Your Travel Plans

Travel timing should be part of your pre-operative discussion. If you are planning a holiday, family visit, or business trip in the weeks before or after your surgery, raise it during your consultation. Mr Hussain will give you advice tailored to your individual circumstances rather than a blanket rule.