Comfortable walking around the house tends to come back within a few days. Confident walking outdoors, an unthinking gait and full thigh strength take a couple of months. The knee then keeps refining itself quietly for the rest of the first year.

Matched comparisons consistently show that people recover faster from a partial knee replacement than from a total one, with fewer medical complications and an earlier return to work.⁸ There are sound mechanical reasons. Only one compartment is resurfaced. Far less bone is removed. The kneecap is not disturbed. Both cruciate ligaments stay, so the knee keeps its own sense of position and its own pattern of movement.

None of that makes it a small operation. It is still a joint replacement, with an implant cemented to living bone, and the timetable below still has to be respected. What shifts is the shape of the curve: the early weeks are easier, and the temptation to overload them is correspondingly greater.

Partial knee replacement suits an enhanced recovery pathway particularly well.¹² Blood loss is modest, the anaesthetic is chosen to wear off cleanly, and you are eating, drinking and on your feet within hours rather than the following morning. That head start is why the stay is often shorter than it would be after a total knee replacement.

NICE guideline NG157 expects rehabilitation from a physiotherapist or occupational therapist on the day of surgery where that can be arranged, and inside 24 hours if not.¹ In practice you will be walked a short distance on crutches, taken up and down a step or two, and taught the first exercises before you go anywhere. The team should also make sure you understand the rehabilitation you will be doing on your own, and what each part of it is for.^1,2

Weight-bearing

Put your full weight through the leg from the outset, as soon as you are judged steady. There is no protected phase and nothing gains from you hopping about on crutches. The implant is cemented and is designed to take load immediately; walking as normally as comfort permits is part of the treatment.

How long will I stay in hospital?

My average inpatient stay is two to three days, and after a partial knee replacement it is often shorter than that. I do not perform this as a day-case operation.

What sets the date is your condition rather than a target: whether you are walking safely, comfortable on tablets rather than injections, medically stable and with a settled wound. Living alone, a long journey home, sickness or blood pressure that needs time to settle, or an operation finishing late in the day will all add a night, quite reasonably.

Before you are discharged

• You can get out of bed, off a chair and on and off a toilet without help.
• You can manage crutches on the level and on your own stairs.
• The knee lies flat, or very nearly, and bends enough to sit and climb safely.
• Your pain is settled on the tablets you are taking with you.
• You have your clot-prevention medication and know when the course ends.
• You go home with an exercise sheet, a contact number and a wound review booked.

Stiffness is much less of a problem after a partial replacement than after a total one. The joint capsule is opened less widely, the kneecap is left alone, and the ligaments that guide the knee are untouched, so the bend you had before surgery usually returns within a few weeks. Many people find the knee bends further than it did in the year before their operation, because the pain that was limiting it has gone.

Straightening still comes first

A knee held even slightly bent makes the thigh muscle work every time you stand on it, and it shows up as a limp that takes months to unpick. This is the one thing worth being obsessive about in the first fortnight.

• Never prop a pillow behind the knee. If you want the leg raised, support the ankle and let the knee fall flat.
• Press the back of the knee down into the bed or sofa, hold the squeeze, release. Repeat through the day.
• Sit with the leg out in front of you rather than tucked under a chair for hours.

Bending usually looks after itself

Flexion generally improves week on week without a fight. Short, repeated sessions still work better than one heroic stretch, and discomfort during a bend is normal as long as it fades soon after you stop. If the bend stalls or slips backwards, tell me — early is far easier than late.

To put numbers on everyday tasks: walking on the flat asks for about 65 degrees of bend, stairs about 90, getting out of a low armchair about 105, and a complete turn of a bicycle pedal about 110. Activities come back in roughly that order.

The exercises have one dominant purpose after a partial replacement, and that is the quadriceps. Movement tends to return on its own; muscle does not. The quadriceps is what locks the knee straight, lowers you down stairs and keeps the knee from buckling on a kerb, and it switches off for a while after any knee operation.

Spread the work through the day in small amounts. Exercise is already the backbone of treating knee arthritis before surgery⁴, and the principle does not change afterwards. Strength is rebuilt deliberately; it does not return simply because the pain has gone.

Early exercises, from day one

• Ankle pumps. Work the foot up and down repeatedly to keep the blood moving and limit swelling.
• Static quadriceps. Flatten the back of the knee, tighten the thigh firmly, hold a few seconds, relax.
• Straight-leg raise. Keep the knee locked, lift the leg clear of the bed, lower it slowly.
• Heel slides. Draw the heel up towards you into a bend, hold, then push back out to full straight.
• Knee hang. Heel on a stool with nothing beneath the knee, letting gravity do the straightening.
• Inner-range quads. A rolled towel under the knee, then lift the heel to straighten against it.

Progressive exercises, as advised

• Sit-to-stand repetitions from a firm chair, using the hands less each week.
• Standing work at a worktop: small knee bends, heel raises, hamstring curls, hip abduction.
• Step-ups and slow, controlled step-downs.
• Static cycling — often possible early, because the bend allows it sooner than after a total replacement.
• Walking, built up gradually, which underpins everything else.

A walking aid is a rehabilitation tool. It is there so that you can walk safely and properly while the thigh muscle catches up, and it comes off when you no longer need it — not on a date I have given you in advance. I deliberately do not set a number of weeks, because people differ and a target encourages the wrong decision in both directions.

Give it up indoors first. Home is level, short-distance and predictable, so it is the sensible place to test yourself. Keep the aid for outdoors, for shopping and for uneven ground until walking without it feels secure there too. Many people are on one crutch or a stick outside long after they have stopped using anything in the house.

The judgement is yours, and it is a simple one: does your walking stay level and controlled without the aid? Letting go while you are still lurching teaches you a limp that then needs training out. Hanging on to one out of habit, once you are steady, teaches you nothing. Watch your reflection in a shop window, or ask someone to walk behind you and say what they see.

Build distance in small steps, several short walks a day rather than one long expedition. A knee that is markedly more swollen and sore the next morning is telling you the dose was too high. Once you are solid indoors, get out deliberately onto pavements, kerbs and slopes, because that is the ground you actually live on.

Managing pain

Pain after a partial knee replacement is usually milder and shorter-lived than after a total one, but the first week still needs proper medication. Several drugs used together control it better than opioids alone and leave you clearer-headed.¹ Take them regularly at first, especially before physiotherapy, then reduce gradually rather than stopping abruptly. If you are taking opioids, take a laxative alongside them.

Expect the pain to fluctuate — quieter in the morning, louder after a busy afternoon. A steady climb rather than a fluctuation is different, and needs assessing.

Managing swelling

There is less swelling than after a total knee replacement, and it tends to resolve over roughly six to twelve weeks rather than dragging on for six months. It still behaves the same way: worse by evening, better after a night lying flat, and prone to flaring after a day on your feet.

• Rest with the leg raised above hip height, supporting the ankle and leaving the knee unpropped.
• Favour frequent short walks over occasional long ones.
• Keep circling the ankles whenever you are sitting.
• Cooling through a cloth can help, where your team has recommended it and the dressing stays dry.

Calf swelling that comes on suddenly, affects one leg only, or is painful or tender needs to be reported the same day, because it may signal a clot.

Sleeping

Nights are usually easier than after a total knee replacement, but a few disturbed weeks are still common, and the knee often aches most when you finally stop moving. Time your pain relief for bedtime, lie with the leg straight rather than curled or propped, and keep daytime naps short so the night still has a job to do. It settles as the swelling does.

The incision is shorter than for a total knee replacement, but the rules are the same, and they are short because wounds do best when left alone.

• Keep the dressing dry. Moisture is what turns an uneventful wound into a problem.
• Do not disturb it unless it soaks through. Staining underneath the film is expected.
• No baths, and nothing that soaks the dressing, until your review. Showering is fine with the dressing covered and dry underneath.
• Put nothing on the wound — no creams, no antiseptics, no powders.
• I take the dressing down at your review at two to three weeks and check the wound then.

A patch of numb or odd-feeling skin to the outer side of the scar is common and is caused by small skin nerves that cross any knee incision. It is not a complication. The patch is usually smaller than after a total knee replacement and tends to shrink over the following months.

Clots in the leg (DVT) or lung (pulmonary embolism) are least likely when you are moving early and often, which is one of the advantages of this operation. The risk is not zero. NICE guideline NG89 advises prophylaxis for elective knee replacement wherever the clotting risk outweighs the bleeding risk. Several regimens are accepted: a 14-day course of aspirin; rivaroxaban; or low-molecular-weight heparin for 14 days, with anti-embolism stockings worn until discharge.³

GIRFT, BASK and BOA documentation standards require the mobilisation and clot-prevention plan to be written into the operation record.⁵ That way the ward, your GP and I are working from the same instructions.

Medication is only part of it. Standing up regularly, circling the ankles when seated, and drinking enough all count, and those parts belong to you. Complete the course even though you feel perfectly well, because the risk outlives the symptoms.

Long journeys sit awkwardly against all of that, which is why I advise against long-haul flights and long surface travel for eight weeks after surgery. Bring your travel plans to your consultation rather than after the operation. Some conditions and some medications raise the risk of clots in the leg independently of the surgery, and where that applies to you we will go through it in detail and plan around it.

No date is set in law. The requirement is functional: get into the car without a struggle, operate the pedals normally, perform an emergency stop without hesitation, be off sedating painkillers, and have an insurer who is content. I expect most people to be driving at around five to six weeks after a partial knee replacement. Occasionally someone meets every one of those tests a week earlier, and that is fine — but it has to be earned rather than assumed.

Which knee was operated on still matters. A left knee in an automatic is ready soonest. A right knee performs the emergency stop and therefore needs both the strength and the speed to slam the brake, which usually takes a little longer.

Being safe to drive is not the same as being ready to commute

Clearance to drive means you are safe at the wheel. It does not mean every journey is equal. A fifteen-minute run to the shops on a quiet afternoon asks very little of the knee. An hour in stop-start rush-hour traffic, with the clutch or the brake worked constantly and no chance to straighten the leg, asks a great deal more — and so does a long motorway trip where the knee sits bent and still for hours.

So build up in the same way you built up your walking. Start with short local journeys at quiet times. Add distance and traffic gradually, and break any longer drive with a stop to stand up, walk about and straighten the leg. That is also why I ask people not to return to a job that involves a punishing commute or long-distance driving at the point they are first cleared to drive.

Routine knee replacement surgery does not in itself require you to notify the DVLA, unless your doctor advises it or you are still unable to drive three months on.¹⁰ Group 2 entitlement for lorries and buses is assessed against a stricter standard, so raise it with me if it applies. Tell your insurer either way, since cover can be invalid if you drive before you are fit.

Test it stationary on the drive first. Move your foot briskly between accelerator and brake several times and press hard. Hesitation means wait.

As a rule I expect people to return to work after the eight-week review, once I have seen how the knee is behaving and we can agree what your job actually asks of it.⁸

Desk-based work is the exception. If you are comfortable, off sedating painkillers and able to get up and move regularly, you can start earlier than that. I would still advise a phased return rather than going straight back to full days.

Whatever the job, avoid a return that involves long spells of driving. Being cleared to drive at five or six weeks means short, easy journeys are safe; it does not mean you are ready for a rush-hour commute or a day of long-distance driving. Sitting still with the knee bent for extended periods is unhelpful while it is still swelling, and it carries its own clot risk in the early weeks. Work involving prolonged standing, kneeling, ladders, uneven ground or heavy lifting needs discussing individually.

BOA standards expect you to be told what functional recovery to expect, including when things like work and driving come back.⁷ Ask for that early, so you can have the conversation with your employer before you need the answer.

Routine follow-up has two fixed points, both in my own clinic:

• Two to three weeks — wound review and dressing change, with an assessment of how the knee is moving and how you are walking.
• Eight weeks — a fuller review of pain, movement, gait, strength and the activities you have resumed.

Between those visits the work is largely yours, with a physiotherapist guiding rather than supervising. NICE expects the therapy team to prepare you for that before you go home, so that you leave knowing the targets and the reasoning behind them.¹ Supervised outpatient rehabilitation is there for those who need more.¹

BASK also publishes patient resources on knee surgery which sit well alongside this page.⁶

NICE does not set a single universal long-term follow-up schedule after primary joint replacement, because the evidence does not support one.¹ Knee pain that is new, or that will not settle, should be assessed rather than lived with.

Most people are pleased with a partial knee replacement, and satisfaction after it compares well with total knee replacement in patients who meet the agreed indications.⁸ A minority are not, and that is worth saying plainly rather than leaving you to discover it alone. BOA and BASK standards put the figure for pain, stiffness or dissatisfaction after knee replacement at somewhere between one in ten and one in five, and ask that those patients be worked up methodically by a consultant-led team rather than told to live with it.¹¹

There is one feature specific to a partial replacement. The compartments that were not resurfaced are still your own, and they still have arthritis ahead of them in some people. Pain that appears months or years later on the outer side of the knee or at the front, having settled well initially, is worth investigating for that reason. It is not a reason for alarm, and it is a reason to be seen.

National registries record a higher revision rate for partial than for total knee replacement.⁹ Part of that is a genuinely different threshold: converting a partial replacement to a total one is a smaller undertaking than revising a total knee replacement, so it is offered more readily. That trade-off is part of the original decision to have this operation, and it is one I go through with you before surgery rather than after it.

• Treating it as a minor operation. The commonest error after a partial replacement. A very active first fortnight buys a swollen, sore third week.
• Sitting with the knee bent for hours. The usual cause of a knee that will not straighten. Sit with the leg extended.
• A pillow behind the knee. Comfortable, and it costs you full extension. Support the ankle instead.
• Doing too little. Hours in a chair cost you movement, thigh muscle and circulation all at once.
• Dropping the exercises once walking feels normal. It feels normal long before the quadriceps has recovered, which is precisely why the strength work gets abandoned too soon.
• Enduring pain. Pain that stops you exercising slows everything behind it. Say so.
• Interfering with the dressing. Changing it unnecessarily, or getting it wet, invites the complication it exists to prevent.
• Anaemia, poor nutrition or unstable diabetes. Each slows healing and saps stamina, and each is worth addressing.

How long does it take to recover from a partial knee replacement?

Most people walk with crutches within hours of surgery and go home after two to three days or sooner. The walking aid comes off when you feel steady without it, indoors first. Driving is usually around five to six weeks, work generally after the eight-week review, and ordinary daily life is largely back by around three months, with strength and stamina still improving over the first year. Recovery is generally quicker than after a total knee replacement.

Is recovery from a partial knee replacement really easier than from a total?

Yes, for most people. Only one compartment is resurfaced, much less bone is removed, the kneecap is left alone and both cruciate ligaments are kept, so there is less pain, less swelling, a shorter stay and an earlier return to normal activity. It is still a joint replacement, and the exercises and precautions still apply.

Can I put my full weight on the leg straight away?

Yes. Once the team is satisfied you are steady, which is usually within hours, the whole leg takes your weight. Nothing is held back or protected, and walking as close to normally as comfort permits does the knee good rather than putting the implant at risk.

How long will I be in hospital?

My average inpatient stay is two to three days, and it is frequently shorter after a partial knee replacement than after a total one. I do not do this as day-case surgery. You go home once you are walking safely, comfortable on tablets, medically stable and with a settled wound — not on a fixed night.

How much will my knee bend after a partial knee replacement?

Because the ligaments and the kneecap joint are undisturbed, the bend usually returns faster and further than after a total replacement, often past a right angle within two to three weeks and close to your pre-arthritis range by six weeks. Many people bend better than they did in the year before surgery.

Why does straightening matter so much?

If the knee will not lie flat, your thigh muscle is left holding you up every time you stand. That is exhausting, sore, and it shows as a limp that takes months to unpick. Keeping full extension during the first fortnight is far simpler than clawing it back later. Sit and lie with the leg extended, and support any pillow under the ankle rather than behind the joint.

How long will I need crutches or a stick?

I do not put a time on it. The aid exists so that your rehabilitation is safe, and you stop using it when you feel you can manage without it. Stop indoors first, where the ground is level and the distances are short, and keep it for outdoors and uneven ground until you feel steady there too. The test is whether your walking stays level and controlled without it.

How painful is it?

For most people it is milder than a total knee replacement, and the first week is the worst of it. Control comes from combining a few different medicines, not from leaning on opioids. Pain that rises and falls with what you have been doing is normal; pain on a steady upward march needs reviewing.

How long does the swelling last?

Usually six to twelve weeks, rather than the three to six months that often follows a total knee replacement. Evenings are the worst of it and a night lying flat helps. Raising the leg on a support under the ankle, and keeping the ankle pumps going, both make a difference. Calf swelling, pain or tenderness that is sudden or confined to one leg should be reported the same day.

When can I shower or have a bath?

Showering is fine from the start if you cover the dressing and it remains dry beneath. Otherwise do not touch it, unless it has soaked through. Avoid baths and anything else that would soak it until your two to three week review, at which point it is removed.

How long do I take blood thinners?

My standard protocol is aspirin for two weeks, one of the options NICE recommends for elective knee replacement. If you already take an anticoagulant, that is restarted 24 to 48 hours after surgery instead, provided there is no sign of bleeding and the wound dressing is reasonably dry.

When can I fly or travel long distances?

I advise against long-haul flights and long surface journeys for eight weeks after a partial knee replacement. Please bring any travel plans to your consultation beforehand, because some conditions and medications increase the risk of clots in the leg on their own, and we can go through yours and plan around them.

When can I drive after a partial knee replacement?

I expect most people to be driving at around five to six weeks, occasionally a week earlier if every test is met. What counts is capability rather than the date: getting in without difficulty, using the pedals normally, stamping on the brake without pausing, being off sedating painkillers, and having an insurer who is satisfied. An operated right knee generally lags behind a left one in an automatic. Being cleared to drive covers short, undemanding journeys first: a rush-hour commute or a long-distance drive asks considerably more of the knee, so build up distance and traffic gradually and break longer trips to stand and straighten the leg. Straightforward knee replacement surgery carries no DVLA notification duty of its own, unless your doctor advises otherwise or you remain unable to drive three months on.

Can I kneel after a partial knee replacement?

Usually more comfortably than after a total knee replacement, once the wound has fully healed. The scar and the numb patch beside it can stay tender for some months, and a kneeling pad helps.

When can I go back to work?

Usually after your eight-week review, when we can match the knee to what the job demands. Desk-based work is the exception and can start earlier if you are comfortable and able to move about regularly. I advise a phased return in either case, and one that does not involve long periods of driving.

Could I still need a total knee replacement later?

It is possible. Registries record a higher revision rate for partial than for total knee replacement, partly because converting a partial to a total is a smaller operation and is therefore offered more readily. Arthritis can also progress in the compartments that were not replaced. New or persistent pain, particularly on the outer side or at the front of the knee, should be assessed rather than tolerated.

When will I be seen after my operation?

Two routine appointments, both with me: the wound is reviewed at two to three weeks, and there is a fuller consultation at eight weeks about pain, movement, gait, strength and the activities you have resumed. Anything that worries you in the meantime warrants a phone call rather than a wait.

This page is independently written for patient education. It summarises published guidance rather than reproducing guideline text, and states my own protocol where it is specific to my practice. Guidance was checked on 11 September 2026.

1. NICE NG157. Joint replacement (primary): hip, knee and shoulder. Inpatient and outpatient rehabilitation, anaesthesia and analgesia recommendations. nice.org.uk/guidance/ng157
2. NICE QS206. Joint replacement (primary): hip, knee and shoulder quality standard. nice.org.uk/guidance/qs206
3. NICE NG89. Venous thromboembolism in over 16s: reducing the risk of hospital-acquired deep vein thrombosis or pulmonary embolism. Elective knee replacement prophylaxis options. nice.org.uk/guidance/ng89
4. NICE NG226. Osteoarthritis in over 16s: diagnosis and management. nice.org.uk/guidance/ng226
5. GIRFT, British Association for Surgery of the Knee (BASK) and BOA. Best Practice for Knee Arthroplasty Surgery Documentation, 2019, including post-operative rehabilitation and thromboprophylaxis planning. boa.ac.uk
6. British Association for Surgery of the Knee (BASK). Professional and patient resources on knee surgery. bask.ac.uk
7. British Orthopaedic Association Standards for Trauma and Orthopaedics (BOAST), on rehabilitation, discharge planning and information about return to normal activities including work and driving. boa.ac.uk
8. Price A, Thienpont E, Catani F, Abram S, Troelsen A, and the BASK and EKS Consensus Group. Consensus statement on unicompartmental knee replacement: a collaboration between BASK and EKS. The Knee 2023;41:391–396. doi.org/10.1016/j.knee.2023.03.015
9. National Joint Registry. Patient information on knee replacement, including partial knee replacement, revision and infection, and NJR annual report revision data. njrcentre.org.uk/patients/knee-replacement
10. DVLA. Assessing fitness to drive: a guide for medical professionals, on notification requirements after surgery. gov.uk
11. BOA and BASK. BOAST: Investigation and Management of Patients with Problematic Knee Replacements, August 2020. boa.ac.uk/standards-guidance/boasts.html
12. British Orthopaedic Association. Providing a Continuous Safe Elective Orthopaedic Environment, February 2021. boa.ac.uk