Part of Total knee replacement rehab
Driving after a knee replacement: the two tests, and who decides
Warning signs, and when to get help
How soon can you drive after a knee replacement?
When your surgical team says the knee can stop the car, and not on the week the calendar reaches. Driving after a knee replacement turns on two things you can actually check: whether you could brake hard and fast enough to stop in an emergency, and whether you are off the medicines that affect your driving.
If what you want tonight is the short version, it is the checklist of reasons to wait longer at the foot of this page. Any one item on it is an answer on its own, and reading nothing else here costs you nothing.
Two sources put a number on it, and both of them attach a condition to the number. The NHS, in its advice on recovering from a knee replacement, says to wait at least 6 weeks after a total knee replacement, or 3 weeks after a partial one, and to check with your doctor that you are fit to drive. OrthoInfo, writing for the American Academy of Orthopaedic Surgeons, says most people resume driving approximately 4 to 6 weeks after surgery, and describes the point as the knee bending enough that you can get in and sit comfortably in your car, with muscle control that provides an adequate reaction time for braking and acceleration.
The NHS figure does something almost nobody points out, and it is the single most useful fact on this subject. It is not one number. A partial knee replacement carries a shorter wait than a total one in that same advice, which matters because plenty of people have had a partial, were handed the leaflet for a total, and are counting to the wrong week. A partial replacement is a different operation and the rest of its plan may be quite different too, so take your own figure from your own team and from the leaflet they gave you. Partial compared with total knee replacement sets out how the two operations differ, and the main knee replacement program explains where partial and revision surgery sit in all of this.
One thing settles the question before any of the above. Your surgical team's instruction comes first, and nothing on this page overrides it. They know what was done inside your knee, whether anything beyond a standard replacement was repaired on the way, whether any limit on weight through the leg still stands, and whether there is a reason particular to you to wait longer. A page can tell you what the published advice says. It cannot see your knee.
And if you are still getting about on crutches or a frame, the question has not reached you yet. That belongs with how long you use a walker, frame or stick. Somebody who needs two hands on an aid to cross a room is not ready to be in charge of a car.
The two tests that matter more than the week number
Both tests are about function, and both are the sort of thing a physiotherapist or physical therapist can watch rather than guess at.
The first is the emergency stop. That is the whole reason the right knee gets any special attention. The second is medicines, with a clinical half and a legal half, and it is covered further down this page.
The first test really measures how quickly and how hard the front of the thigh can fire, because that is what drives your foot into the brake pedal and holds it there. Comfort is not the same measure and recovers on its own schedule, so a knee that feels fine sitting still can be nowhere near ready. The exercises that build that specific quality are the ones your team will already have given you, and ours are quad sets, short arc quads and seated knee extension. How many, how often and how hard belongs to the program itself and to your own team rather than to this page, and your physio or physical therapist will adjust it to your knee and your stage.
There is a reason that particular quality is the slow one to come back. The front of the thigh is the muscle a surgeon has to work past to reach the joint, and it is also the muscle that drives your foot into the brake pedal. Measured in 20 patients about a month after a first knee replacement, quadriceps strength was down 62% on what it had been before the operation, and most of that was the muscle failing to switch on fully rather than wasting away: failure of voluntary activation contributed nearly twice as much as loss of muscle bulk (Mizner and colleagues, 2005). Pain during the test explained surprisingly little of it. That last finding is the one to take to the car, because it means a knee that is not hurting much can still be a long way from being able to stand on a brake pedal.
The second thing the pedals ask for is bend, and it is easy to miss until you try. You need enough movement to get the leg into the footwell, to sit with the knee flexed for the length of the journey, and to move the foot between pedals without lifting the whole leg. Heel slides and sit to stand are the two that show you where that bend has got to, and OrthoInfo describes the usual expectation as bending the knee sufficiently to climb stairs and get in and out of a car.
A practical way to use all of this: take the two tests to your six week check-up as questions rather than waiting to be told. The exercises for weeks 2 to 6 covers what that appointment is for, and the exercises for weeks 6 to 12 covers the strength work that carries on well past it.
The emergency stop, and what the braking studies measured
This is the one part of the subject that has been measured properly, and it is worth knowing what was and was not measured.
The evidence comes from three places. A systematic review of nine prospective studies, 330 people in total, reported braking time returning to its pre-operative level by 2 weeks after a left total knee replacement and by 4 weeks after a right one (Hartman and colleagues, 2018). A meta-analysis of 19 studies in people having an elective primary hip or knee replacement for osteoarthritis found total brake response time back to baseline 4 weeks after a right total knee replacement (van der Velden and colleagues, 2017). And a driving simulator study of 30 people who had a right total knee replacement, average age 66, compared with 45 healthy controls whose average age was 32, found that the thing still lagging at three to four weeks was not reaction speed but the force they could put through the brake pedal, with everything back to its starting point at 6 weeks and the authors recommending a minimum wait of 6 weeks (Kirschbaum and colleagues, 2021).
Read those three together and a pattern shows up that is more useful than any of the individual weeks. Reaction time comes back early. Pedal force, the ability to actually stand on the brake, comes back later. A test that only times how fast you move your foot will say you are ready before you are. Put that next to what was measured in the thigh at about the same stage, the 62% above, and the shape of it is clear enough: a normal brake reaction time at four weeks is not evidence of a leg that can hold the pedal down.
It is worth knowing how hard that push actually is. In the same simulator study, the force those patients put through the pedal in an emergency stop averaged 614 newtons before their operation, roughly the weight of a 63 kg (138 lb) adult driven through one foot. Five days after surgery it had dropped to 411 newtons. At three weeks it was back up to 555 newtons and was still the one measure significantly below where they started, with reaction times by then no different from their own baseline. An emergency stop is a strength task before it is a reaction task, which is why it is the part of this question a surgical team wants to answer rather than a calendar.
There is a list of things those studies cannot tell you, and it changes how much weight the numbers deserve. The gearbox is the one variable that decides whether a left knee matters at all, and none of the three was built to answer it: the simulator study does not report whether its participants drove a manual or an automatic, and the two reviews pool their results by the side that was operated on rather than by gearbox. They measured in laboratories and simulators rather than in traffic. The simulator also left out the brake servo that a modern car has, which the authors list among their own limitations: they could not test how far a brake booster makes up for a weaker push, and they add that an emergency stop is by definition a fast and powerful movement. The simulator study's control group was more than thirty years younger than its patients, 32 against 66, and the authors say plainly that it was not matched for age or gender, so it cannot tell you what age contributes. Read that as the authors do rather than as a reason to discount their figure: the timings come from each patient measured against their own level before the operation, and the authors point out that holding patients up against a younger healthy group makes the test stricter, not kinder. They are studies of groups, so none of them is about you. And two of them produce figures shorter than the wait the NHS asks for, which is a reason to be careful about quoting them, not a reason to drive at two weeks. Where a laboratory measure and national advice disagree, take the more cautious one and let your team settle it.
Does it matter which knee it was, and does an automatic change things?
Yes to the first, and yes to the second, and the two answers are linked by one fact about cars.
The pedal layout is the same in every market this page is written for. Whether the car is left-hand drive, as in the United States and Canada, or right-hand drive, as in the UK, Australia and New Zealand, the brake and the accelerator sit under your right foot and the clutch, where there is one, sits under your left. The exception is a car with adapted controls, a hand-operated brake or a left-foot accelerator, where the question is which limb does which job and the answer comes from the people who fitted them. So a right knee replacement is the one standing between you and an emergency stop. A left knee replacement affects the clutch, which means it matters in a manual car and matters much less in an automatic.
That is not a loophole, and it is the part most likely to be misread. A left knee and an automatic gearbox remove one demand on the leg. They do not remove the rest: you still have to get into the car, sit for the journey, turn to look behind you, and be off the medicines. Nor do they shorten anything your own team has told you, and the NHS wait is not written as a right-knee wait.
Two situations sit outside that left and right logic altogether. If both knees were replaced at the same sitting, neither leg is the spare one and the side question does not help you, so ask your surgical team directly: none of the published waits was written for two new knees at once. And braking with the other foot is not a way around a new right knee. An emergency stop is a movement you have to already own rather than one to attempt for the first time when a car pulls out, and where a vehicle genuinely needs adapting, that is a matter for your licensing authority and for the people who fit the controls.
If you drive a manual, say so when you ask. The question "am I fit to drive" and the question "am I fit to work a clutch in stop-start traffic" can have different answers in the first weeks, and the second one will not get answered unless you raise it.
Being allowed is a separate question from being ready
A fit knee and permission to drive are two different things, decided by two different sets of people, and running them together is where readers get into trouble.
In England, Scotland and Wales, the DVLA guidance on assessing fitness to drive sets out who holds what. The agency is legally responsible for deciding whether somebody is medically unfit to drive, and its guidance states that it is for the patient to assure themselves that they are fit to drive. The duty to tell DVLA about an injury or illness likely to affect safe driving sits with the licence holder, and the guidance excepts some short-term conditions that are unlikely to continue beyond 3 months. Whether your own recovery falls inside that exception is not something a web page can decide for you, and DVLA is the body that answers it. The same guidance says that anyone unable to control their vehicle safely must not drive, which is the plain-English version of the whole subject.
Insurance is a separate matter again, and this is not a rule but a contract. Your policy is worded by your insurer and only they can tell you what it requires after surgery. Worth knowing: the NHS advice on recovering from a knee replacement does not mention insurance at all, so the question is genuinely unanswered by the clinical guidance and has to be asked directly. Call your insurer, tell them you have had a knee replacement, tell them what your surgeon or doctor has said about driving, and ask whether anything about your cover changes. Do that before the first drive rather than after a bad afternoon.
This page quotes the licensing position only for England, Scotland and Wales, because that is the one it could read at source. The same DVLA guidance names a different agency for Northern Ireland, the DVA, and the drug driving law quoted below does not cover Northern Ireland either. If you are in Northern Ireland, the United States, Canada, Australia or New Zealand, the rule where you live is set by your own licensing authority and this page does not attempt to state it. Ask them, and ask your insurer, in the same week you ask your surgical team.
Can you drive while you are still on painkillers?
Not on your own assessment of how the tablets are affecting you, and the question deserves more respect than it usually gets.
The clinical answer from OrthoInfo is reasonably clear, and it is a pair of conditions rather than a date. In most cases, it says, driving becomes safe once you have stopped taking opioid pain medication and your strength and reflexes have come back toward normal, with your doctor helping you decide when that is. That is a sensible pairing, because the medicines that take the edge off a new knee are often the ones that blunt the reactions you are relying on.
The legal answer in England, Scotland and Wales, from the gov.uk guidance on drugs and driving, is that it is illegal to drive with legal drugs in your body if it impairs your driving. The named list includes morphine and the opiate or opioid drugs, such as codeine, tramadol or fentanyl, and the guidance tells you to talk to your doctor about whether you should drive if you have been prescribed any of them. It also says you can drive if you have been prescribed them, have followed a healthcare professional's advice on how to take them, and they are not making you unfit to drive. The decisive words there are the last ones. Having a prescription is not the test; the effect on you is.
Timing catches people out twice over. The day you stop a painkiller is not automatically the day your reactions are back, so stopping the tablets in the morning and driving in the afternoon is not the plan. And a bad night's sleep on top of a medicine gets routinely underestimated, which is why a first drive after three broken nights is a poor choice whatever the tablets say.
Never stop or change a prescribed medicine on your own. If coming off a painkiller in order to drive is what you are thinking about, that is a conversation with the person who prescribed it, and it usually ends up being about pacing the drive rather than dropping the dose.
Before you drive: the passenger seat and the climb in
Most people are a passenger for weeks before they are a driver. The ride home from hospital is the first test of the only thing that limits a knee in a car: how far it bends, and how much room the leg has.
A front seat slid all the way back, with the backrest eased off a little, gives the leg more room than the back of a small car. Getting in is easier backward: sit down onto the seat first with the leg out, then bring the leg in, rather than trying to lead with the knee. The NHS early advice asks you to avoid twisting the knee, and swinging the leg out of a footwell while the foot is still planted is that movement exactly, so move the whole leg and let your body follow it. The same precaution is the reason to mention turning in the seat to look behind you before your first drive rather than finding out about it at a junction. Longer journeys are worth breaking up, and that is not only a comfort matter. The deep vein thrombosis warning below names a long trip and a spell of being much less mobile than usual among the situations that raise clot risk after surgery, so a long drive in the early weeks deserves stops, ankle movement and a word with your team first.
Use the passenger trips as a rehearsal. Sit in the driver's seat on the drive and find out whether you can get the leg in, reach the pedals, and press the brake firmly without shifting your whole body to do it.
Set that up so the car cannot move. Level ground, parking brake on, in park or in neutral, engine off and the key out rather than turned, and not a car somebody else is about to drive off. Do not start the engine to make the pedal feel normal. With the engine off the pedal goes hard after the first press or two, because the servo that usually helps you is not working, which makes it a stiff test rather than an unfair one and is not evidence that your leg has got worse. That tells you something real, and it tells it to you in a parked car.
Making the first drive a small one
Treat it as a test rather than an errand, because that is what it is.
A short, familiar route in daylight, in good weather, on quiet roads, with somebody with you if that is possible at all. Nothing that commits you: no motorway, no school run, no appointment you have to get to, and no trip you cannot abandon halfway. Move the seat before you start the engine rather than at the first junction. Then see how the knee is the next morning, which is the honest judge of most things after this operation.
Plan the walk at the far end as well as the drive. A car park, a lift that is out of order and the walk back carrying something are all on the operated leg, and for the first few trips the driving is usually the easier half. Take the aid you are still using with you, even if you resent putting it in the boot.
If it goes well, build up the same way the rest of the recovery is built up, in steps you can stand to repeat. If it does not, that is information and not a setback, and it is the thing to report at your next appointment. The wider arc that all of this sits inside is on the recovery timeline week by week.
A note for anyone who has had both joints done, because the answer is not the same twice: driving after a hip replacement is a different page with different sources behind it, and a hip is not judged the way a knee is.
Reasons to wait longer, and what needs checking first
Some of these are reasons to delay a drive, and some are reasons to pick up the phone before you think about the car at all.
Wait, and ask again rather than deciding it yourself, if any one of these is true of you today. Any single one is an answer, however well all the others look.
- Your surgical team has not yet said you are fit to drive.
- A limit on how much weight the leg may take, a brace or splint, or any other restriction from your operation still stands.
- You still need a crutch or a stick to walk any distance.
- The knee will not bend enough to get into the car and sit comfortably.
- You cannot press the brake firmly without planning it first.
- You are still taking a medicine that affects your driving.
- You have not yet checked where you stand with your licensing authority and your insurer.
Some knee operations are not a standard first replacement, and for those the week numbers on this page do not apply at all. Ask your surgeon about yours specifically if it was a revision, meaning a second or later replacement of the same knee; if the tendon mechanism at the front of the knee was repaired, or the piece of bone that the kneecap tendon pulls on was cut and fixed back to get into a stiff knee; if a broken bone was fixed at the same time, or the replacement was done because of a fracture rather than because of arthritis; or if you are still in a brace or splint that limits how far the knee bends. In each of those the brake pedal pulls on the exact thing that is healing, and the only person who knows what it can take yet is the surgeon who did it.
Two of these feel minor and are not, so they get their own paragraph. A knee that gives way or feels unstable is not a knee to be in charge of a car with, and the warning line below asks for that to be raised within a few days rather than at your next routine appointment. And anything that affects the foot itself, a foot that drags, catches or slaps down, or new numbness or tingling in the lower leg or foot beyond the numb patch around your scar, needs medical advice the same day, because the foot is what works the pedals.
Dizziness or lightheadedness on standing that is new for you, or feeling faint during or after your exercises, also needs advice the same day, and nobody should be driving while that is unexplained. If you have a fall or a knock, even a small one, deal with that first and do not drive yourself to be seen. A leg that is swelling further from week to week instead of settling, rather than swelling that is simply still there, also needs advice the same day, and a long drive with the leg down is exactly the setting where that gets written off as the journey. Further out than any of this, pain in the knee that had settled and has come back, or pain that is worse month by month, is a review rather than an emergency, and the routine line below gives it the urgency it has. A knee that becomes hot, red or swollen at any time after the operation, even years later, is a same day call on its own, and a normal temperature is not an all clear either: OrthoInfo's page on infection after a joint replacement says fever is no longer considered a sign of an infection after a joint replacement, and that the signs can be as little as mild redness and swelling. The full set of warning signs below gives each one the urgency it needs, including the clot and bleeding lines that matter on a long journey.
For anyone wondering whether the exercise side of this is worth the trouble, NICE guideline NG157 on primary joint replacement puts rehabilitation on the day of surgery where possible and within 24 hours of it, asks for clear goals and a point of contact for advice and support where you are carrying on by yourself, and asks for supervised outpatient rehabilitation for people who are struggling with daily activities, who have ongoing functional problems with specific needs, or who are not meeting their goals on their own. If getting back to driving is one of your goals, say so, in those words, to the person running your rehabilitation. It is the kind of specific target that tends to get acted on.
This page is education rather than advice about your own knee. Your surgical team, your licensing authority and your insurer are the three that decide this between them, and all three will answer a direct question.
Related exercise programs
Warning signs
Get emergency help now
- Emergency: since your operation, you suddenly become short of breath, you get chest pain or pain in your upper back that may be worse when you breathe in, you cough up blood, your heart is beating very fast, or you faint. Call emergency services straight away, even if your leg looks normal. These can be signs of a blood clot in the lungs (pulmonary embolism).
- Emergency: after a fall or a knock, you cannot put weight on the leg, your knee or thigh is very painful, or the leg looks out of shape or shorter than the other. Go to an emergency department straight away, and do not drive yourself. If you cannot get up, call emergency services. A broken bone around a knee replacement is rare, but it needs treatment in hospital. If a smaller fall or knock leaves the knee newly painful, swollen or bruised, even if you can still walk on it and the leg looks normal, stop the exercises, go back to your crutches or sticks and keep your full weight off that leg, and get it checked by your surgical team the same day. A break in the bone around a new knee is not always obvious at first, and walking normally on one can move the broken ends apart.
Get help today
- Same day: a calf or thigh that is newly swollen or getting more swollen, warm, tender, red or darker than usual, has swollen veins that are sore to touch, or has a throbbing or cramping pain that does not fit your injury or condition, or that feels different from normal muscle soreness after exercise. This can be a sign of a blood clot (deep vein thrombosis), especially after surgery, an injury, time in a cast or boot, a long trip or a spell of being much less mobile than usual. Get medical advice the same day. If you are also short of breath or have chest pain, call emergency services.
- Same day: swelling in the operated leg that is increasing from week to week instead of settling, including swelling spreading into your calf, ankle or foot, pain in your leg or calf away from the wound, increasing pain in your calf, or tenderness or redness above or below your knee. Get medical advice the same day. Some swelling is expected for months after this operation, but OrthoInfo lists new or increasing swelling in the calf, ankle and foot, increasing calf pain, and tenderness or redness above or below the knee among its warning signs of a blood clot in the leg, and asks for them to be reported to your doctor rather than watched. Your clot risk does not end on the day your tablets or injections do. If you are also short of breath or have chest pain, call emergency services.
- Same day: you are taking tablets or having injections to lower your risk of a blood clot and you notice blood in your urine, black or bloody stools, bleeding gums, a nosebleed that goes on and on, bruising far beyond what the knock would explain, or you are being sick or coughing up blood. Get medical advice the same day, and do not stop the medicine on your own. Bleeding more easily is the known trade-off of these medicines (NHS), and the dose or the type may need looking at. Go to an emergency department if the bleeding will not stop, you feel faint, or you bang your head while you are taking it, even if you feel fine, because the NHS advises getting urgent advice after a head injury on medicine that thins your blood and only a hospital can scan for a bleed inside the head.
- Same day: your wound becomes more red, hot, swollen or painful, starts to leak or ooze, is still leaking in the second week or has never stopped, has pus coming out of it or its edges start to come apart, or you have a high temperature or feel hot, cold or shivery. Contact your surgical team or get medical advice the same day. Redness can be harder to see on brown or black skin. If you feel very unwell, go to an emergency department. If you have a very high or very low temperature, shivering you cannot control, you are breathing very fast or finding it hard to breathe, you are confused or your speech is slurred, your skin, lips or tongue look blue, gray, pale or blotchy (on brown or black skin this can be easier to see on the palms of the hands or soles of the feet), or you have a rash that does not fade when you press it, call emergency services, as this can be sepsis.
- Same day: in the days or weeks after your operation you are getting more and more tired, breathless doing everyday things such as walking to the toilet or getting dressed, dizzy or lightheaded, your heart is racing, or your skin looks paler than usual. Contact your surgical team or get medical advice the same day. Tiredness and breathlessness that build up like this are not part of the usual recovery. Blood loss during and after a knee replacement can leave you short of red blood cells (anemia), which is treatable, and a slow bleed or an infection can show up the same way. If breathlessness comes on suddenly, or you get chest pain, call emergency services, as the emergency line above explains.
- Same day: since your operation, the redness, warmth, swelling or pain in your knee is not getting better or is getting worse, for example the knee pain keeps building both when you move and when you rest. Contact your surgical team or get medical advice the same day, as this can be a sign of infection around the new joint. If you feel very unwell, go to an emergency department.
- Same day: at any time after your operation, even years later, new pain in your new knee along with a high temperature or feeling hot, cold or shivery, or a knee that becomes hot, red or swollen, which counts on its own, with or without pain and with or without a temperature. Contact your surgical team or get medical advice the same day. A new joint can become infected long after the operation, and that needs treating quickly. A normal temperature is not an all clear: OrthoInfo says fever is no longer considered a sign of an infection after a joint replacement, that the signs can be as little as mild redness and swelling and sometimes there are none at all, and that increased pain or stiffness in a joint that had been working well is one of them. So do not wait for a temperature before you report new or increasing pain in your new knee to your surgical team.
- Same day: you suddenly cannot straighten your knee or lift your leg straight when you could before, often after a pop, a tearing feeling or a stumble, or you notice a dip just above or below your kneecap, or you suddenly cannot put weight on the leg, even without a fall. Keep your weight off it and contact your surgical team the same day. If you cannot reach them that day, go to an emergency department. A tendon at the front of the knee may have torn, and a repair works better when it is done soon.
- Same day: a leg or foot that is getting weaker, for example your foot drags, catches on the ground or slaps down when you walk (foot drop). Get medical advice the same day. Until it has been checked, use your walking aid, hold a rail on stairs and keep off uneven ground, because a foot that catches trips you and a fall onto a new knee can damage it. If the weakness is getting worse by the hour, go to an emergency department.
- Same day: new numbness, tingling or burning in your lower leg or foot, beyond the numb patch of skin around your scar. Contact your surgical team or get medical advice the same day. If it started after a fall or an injury, or your foot or toes turn cold, pale, blue or gray, call emergency services or go to an emergency department straight away, and do not drive yourself.
- Same day: dizziness, lightheadedness, blurred vision or feeling faint when you stand up that is new for you, does not pass within a minute or two, keeps happening, or has made you fall. Sit or lie down, and get medical advice the same day. This can be a drop in blood pressure on standing (postural hypotension), a type of low blood pressure, which the NHS lists among the causes of falls, and your doctor can check it. Tell them about your medicines, because some can cause it. If it does not settle within a few minutes of sitting or lying still, call emergency services. If you faint, call emergency services, even if you come round quickly, because the NHS says to call them when someone faints while exercising or is badly hurt, and a fall onto a new knee can damage it.
- Same day: dizziness or feeling faint during or after exercise, other than the brief lightheadedness as you stand up covered in the line above, without any of the emergency signs above. Stop the exercises and get medical advice the same day. If you faint, it does not settle within a few minutes of sitting still, or you cannot stand or walk steadily, call emergency services.
Book an appointment
- Within a few days: your knee is not bending or straightening any further from week to week, is getting stiffer, or feels unstable or gives way when you stand or walk. This is not an emergency, but contact your physio or surgical team within the next few days rather than waiting for your next routine appointment, and keep using your walking aid until they have checked it. A stiff knee is easier to free up early than late: where it has to be freed up under anesthetic, doing that earlier, generally within about 6 to 12 weeks of the operation, is associated with regaining more movement than doing it later, although how much any one knee gains also depends on how stiff it was to begin with, on who is suitable and on the rehabilitation afterward. So the date you raise it matters (Hosanee and colleagues, 2026). If the knee has given way and let you fall, or it gives way on stairs, hold a rail and use your walking aid every time, and stay off stairs on your own until you have been seen.
- Within a few days: you have had a fall, even if you were not hurt, or you keep tripping, stumbling or feeling that your legs might give way. Book an appointment with your doctor within a few days and ask about a falls assessment. Tell them about every fall, even the ones where you were not hurt.
- Routine: pain in your new knee that had settled and has come back, or pain that is getting worse month by month, for example pain that starts as soon as you stand up and begin to walk. This is not an emergency, but ask your surgical team for a review, as the parts of a new joint can loosen or wear over the years. Get medical advice the same day instead, not a routine appointment, if the knee also becomes hot, red or swollen, or you have a high temperature or feel hot, cold or shivery, or the pain is building week by week rather than month by month. A new joint can become infected years after the operation, and the two can feel similar at first.
Common questions
How soon can you drive after a knee replacement?
The NHS says to wait at least 6 weeks after a total knee replacement, or 3 weeks after a partial one, and to check with your doctor that you are fit to drive. OrthoInfo describes most people resuming driving approximately 4 to 6 weeks after surgery, with the knee bending enough to get in and sit comfortably in the car and with muscle control good enough for braking and acceleration. Those are the two sourced answers, and neither of them is permission for you in particular. Your surgical team gives that, and a team may want longer where the operation was not a straightforward first replacement.
Is it different if it was my left knee?
The pedals are laid out the same way in every car in the United States, the UK, Canada, Australia and New Zealand: your right foot works the brake and the accelerator. So a right knee replacement is the one that sits directly between you and an emergency stop, and a left knee replacement affects the clutch, which only exists if your car is a manual. Laboratory braking measurements do separate the two sides, and a systematic review of nine studies in 330 people found braking time back to its starting point by 2 weeks after a left total knee replacement and by 4 weeks after a right one (Hartman and colleagues, 2018). That is a measurement, not a clearance, and it is shorter than the wait the NHS asks for. Nobody should take a side difference as a reason to drive sooner than their own team has said.
Will my car insurance still cover me?
That is a question for your insurer and nobody else, because an insurance policy is a contract with its own wording rather than a medical rule. The NHS page on recovering from a knee replacement says nothing about insurance at all, so it does not answer this. Call the number on your policy, say you have had a knee replacement and when, say what your surgeon or doctor has told you about driving, and ask whether anything changes for you. Get the answer before the first drive rather than after an incident, and ask for it in writing or in an email if the policy matters to you.
Can I drive while I am still taking painkillers?
Not on the strength of your own guess, and the medicine itself is less important than whether it is affecting you. For England, Scotland and Wales the gov.uk guidance is blunt about it: it is illegal to drive with legal drugs in your body if it impairs your driving, and it names morphine and the opiate or opioid drugs, such as codeine, tramadol or fentanyl, among the medicines to talk to your doctor about. OrthoInfo frames the clinical side the same way round, putting safe driving after a knee replacement at the point where you are no longer taking opioid pain medication and your strength and reflexes have returned to a more normal state. Ask your doctor or pharmacist about the exact medicines on your own list. Never stop or change a prescribed medicine on your own.
How do I know I could do an emergency stop?
You cannot know it from the driver's seat on the day, which is the honest answer and the reason it goes to your team. What they are judging is whether the thigh can switch on fast and hard, not whether the knee is comfortable, and those two recover at different rates. In a driving simulator study of 30 people after a right total knee replacement, average age 66, the measure that was still down at three to four weeks was the force on the brake pedal rather than the speed of the reaction, and everything was back to each patient's own level from before the operation at 6 weeks, which is why the authors recommend waiting at least that long (Kirschbaum and colleagues, 2021). The healthy group they also tested was more than thirty years younger, which the authors say makes the comparison stricter rather than kinder, not a reason to read the 6 weeks as generous. Take that to your team as a question about strength rather than about pain, and ask them to watch you push.
Can I be a passenger before I can drive?
Usually yes, and most people are in a car well before they drive one, starting with the trip home from hospital. The limit on a knee is how far it bends and how much room there is to get the leg in, so the front passenger seat with the seat slid back is easier than the back of a small car. Plan the lift home and the first few appointments rather than improvising them, and if the climb in and out is the hard part, that is a bend and a strength question rather than a driving one.
References
- NHS. Recovering from a knee replacement. Page last reviewed 9 September 2026. https://www.nhs.uk/tests-and-treatments/knee-replacement/recovery/
- American Academy of Orthopaedic Surgeons. Total knee replacement. OrthoInfo. https://www.orthoinfo.org/en/treatment/total-knee-replacement/
- American Academy of Orthopaedic Surgeons. Activities after total knee replacement. OrthoInfo. https://www.orthoinfo.org/en/recovery/activities-after-knee-replacement/
- American Academy of Orthopaedic Surgeons. Infection after joint replacement. OrthoInfo. https://www.orthoinfo.org/en/diseases--conditions/joint-replacement-infection/
- Driver and Vehicle Licensing Agency. Assessing fitness to drive: general information. GOV.UK. https://www.gov.uk/guidance/general-information-assessing-fitness-to-drive
- GOV.UK. Drugs and driving: the law. https://www.gov.uk/drug-driving-law
- Hartman J, Thornley P, Oreskovich S, Adili A, Bedi A, Khan M. Braking time following total knee arthroplasty: a systematic review. The Journal of Arthroplasty. 2018;33(1):284-290.e1. https://doi.org/10.1016/j.arth.2017.08.012
- van der Velden CA, Tolk JJ, Janssen RPA, Reijman M. When is it safe to resume driving after total hip and total knee arthroplasty? A meta-analysis of literature on post-operative brake reaction times. The Bone and Joint Journal. 2017;99-B(5):566-576. https://doi.org/10.1302/0301-620X.99B5.BJJ-2016-1064.R1
- Kirschbaum S, Fuchs M, Otto M, Gwinner C, Perka C, Sentürk U, Pfitzner T. Reaction time and brake pedal force after total knee replacement: timeframe for return to car driving. Knee Surgery, Sports Traumatology, Arthroscopy. 2021;29(10):3213-3220. https://doi.org/10.1007/s00167-020-06105-2
- Mizner RL, Petterson SC, Stevens JE, Vandenborne K, Snyder-Mackler L. Early quadriceps strength loss after total knee arthroplasty. The contributions of muscle atrophy and failure of voluntary muscle activation. The Journal of Bone and Joint Surgery. American Volume. 2005;87(5):1047-1053. https://doi.org/10.2106/JBJS.D.01992
- National Institute for Health and Care Excellence. Joint replacement (primary): hip, knee and shoulder. NICE guideline NG157. Published 4 June 2020. https://www.nice.org.uk/guidance/ng157
- Hosanee S, Elebo N, Sikhauli N, Pietrzak JRT. Reluctant knee: understanding and managing stiffness after total knee arthroplasty. International Orthopaedics. 2026;50(9):2337-2346. https://doi.org/10.1007/s00264-026-06905-0
- NHS. Anticoagulant medicines. Page last reviewed 9 September 2024. https://www.nhs.uk/conditions/anticoagulant-medicines/
- NHS. Sepsis. Page last reviewed 14 May 2026. https://www.nhs.uk/conditions/sepsis/
- NHS. Falls. Page last reviewed 6 March 2025. https://www.nhs.uk/conditions/falls/
- NHS. Low blood pressure (hypotension). Page last reviewed 11 July 2023. https://www.nhs.uk/conditions/low-blood-pressure-hypotension/
- NHS. Fainting. https://www.nhs.uk/symptoms/fainting/
Written and checked by the PocketPhysio editorial team. Last updated 2026-10-17.
This page is general education, not a diagnosis or a personal treatment plan. See a physiotherapist or doctor for advice about your own situation.