Preparing for Arthroscopy: Medication Review, Fasting and Arranging a Ride Home

The letter sits on the kitchen table next to a half-finished coffee. It confirms a knee arthroscopy, lists an arrival time, and then, in smaller type, asks about medicines, food and who will be driving. Most people read the first line and stop. The small type is where preparing for arthroscopy actually happens.

There is a reason the questions sound fussy. A keyhole operation on a joint is short, often finished inside an hour, yet it still involves anesthesia, a fasting stomach, and a body that may be taking anything from a daily blood thinner to a fish oil capsule. Each of those changes how the day unfolds.

This explainer walks through the three things that trip people up most: the medication review, the fasting window and the ride home. None of it replaces the instructions from your own team. It should, however, make those instructions make sense.

What actually happens during an arthroscopy

An arthroscopy is a procedure in which a surgeon looks inside a joint using an arthroscope, a pencil-thin tube with a camera and light at its tip. The camera sends a magnified image to a screen, so the surgeon can see cartilage, ligaments and joint lining directly rather than relying only on scans.

The team makes two or three small cuts around the joint. Mayo Clinic describes each as roughly the size of a buttonhole. One cut admits the arthroscope; the others admit slim instruments for trimming, shaving, stitching or removing tissue. Sterile fluid is pumped in to open up the space and rinse away debris, which is why the joint often feels puffy for a few days afterwards.

Knees and shoulders are the most common sites, but hips, ankles, wrists and elbows are also treated this way. Some arthroscopies are purely diagnostic, to confirm what a scan could not settle. Most combine looking with doing: tidying a torn meniscus (the crescent of cartilage that cushions the knee), removing a loose fragment of bone or cartilage, repairing a labrum (the rim of cartilage around the shoulder or hip socket), or releasing tight tissue.

The NHS notes that an arthroscopy usually takes between 30 minutes and 2 hours, and most people go home the same day. The cuts are closed with a stitch or two, or simply a small dressing.

Short and small, though, is not the same as minor. The anesthesia, the fluid inside the joint and the healing tissue set the rules for the next few weeks. That is the lens to keep in mind as the preparation checklist unfolds.

Why preparing for arthroscopy starts weeks ahead, not the night before

Most hospitals invite you to a pre-assessment appointment once the operation is booked. A nurse, and sometimes an anesthesia clinician, reviews your medical history, checks blood pressure, and may arrange blood tests or a heart tracing depending on your age and conditions. This visit is the practical beginning of preparing for arthroscopy, and it is where the medication and fasting plan gets written.

Lead time matters for three reasons.

First, some medicines take days to leave the body or to have their effect reversed, so any pause has to be planned, not improvised. Second, the pre-assessment is the moment to mention anything that might change the plan: a recent chest infection, a new heart symptom, a graze or insect bite over the joint, a pregnancy, or a tooth abscess. Surgeons commonly postpone if there is broken or infected skin near the operating site, because bacteria on the surface can be carried inside the joint.

Third, the parts of preparation that improve healing are slow. Stopping smoking, even for a few weeks, helps wound healing and lung function under anesthesia; the NHS encourages it before any operation. If a physiotherapist has given pre-operative exercises, sometimes called prehab, they work by building strength around the joint before it is asked to recover.

A realistic sequence looks like this: when the date arrives, write your full medicine list; attend pre-assessment and leave with written instructions; book your driver and overnight companion; sort out time off work and childcare; then, in the last day or two, focus on fasting times and the bag by the door.

Who is usually offered arthroscopy, and who is asked to wait

Arthroscopy is usually offered when examination and imaging point to a mechanical problem inside a joint that a camera and instruments can address. Typical examples include a torn meniscus that causes the knee to lock or give way, a loose fragment floating in the joint, a labral tear in the shoulder or hip, certain ligament injuries, and persistent symptoms where the diagnosis remains unclear after scans.

The evidence draws a firm line in one area. For knee pain caused mainly by osteoarthritis, the wear-related thinning of cartilage, trials have not shown a lasting benefit from arthroscopic washout or debridement, and the NHS states that arthroscopy is not usually recommended for osteoarthritis alone. If that is your diagnosis, it is reasonable to ask your team what specific mechanical problem the operation is meant to fix.

People are commonly asked to wait when:

• there is an active infection anywhere in the body, or broken skin over the joint;
• blood sugar is poorly controlled, since high glucose slows healing and raises infection risk;
• a heart attack, stroke or clot has happened recently and the risk of anesthesia is still elevated;
• a new medicine such as a blood thinner has just been started for another reason;
• pregnancy makes non-urgent surgery better deferred.

Alternatives always exist and deserve a plain conversation: structured physiotherapy, activity modification, injections into the joint, watchful waiting for tears that may settle, or open surgery when the problem is too large for keyhole tools. Whether to operate, and when, is a decision that sits with your treating team, weighed against what matters to you.

Medication review before arthroscopy: what to tell your team

Bring the complete picture. That means every prescription medicine, but also inhalers, patches, eye drops, creams, contraceptive pills, hormone therapy, over-the-counter painkillers, sleep aids, vitamins, protein powders and herbal remedies. Recreational drugs and alcohol intake belong on the list too; anesthesia teams need them to choose safe drugs and doses, and they ask without judgment.

Why so thorough? Medicines interact with anesthesia, alter bleeding, shift blood sugar and blood pressure, and change how the body handles stress. A supplement that seems harmless at breakfast can matter on an operating table.

The categories that most often prompt specific instructions are:

• anticoagulants and antiplatelets, covered in the next section;
• diabetes medicines, because fasting changes the balance;
• steroid tablets taken long term, since the body’s own stress response can be blunted and the team may need to compensate;
• hormonal contraception and hormone replacement, which raise clot risk and are sometimes reviewed for longer lower-limb operations;
• blood pressure and heart medicines, most of which are usually continued with a sip of water, though some classes are held on the morning;
• herbal products such as ginkgo, garlic, ginseng and high-dose fish oil, which can thin the blood, and St John’s wort, which alters how the liver processes anesthetic drugs.

Leave the appointment with written guidance that names each medicine and states continue, pause, or last take before surgery. If anything is unclear, your community pharmacist can help you understand it. What no one should do is edit the list themselves. Pausing something to be on the safe side can carry more risk than continuing it, and the reverse is equally true.

Blood thinners before arthroscopy: why timing is a team decision

Two families of medicine reduce clotting. Anticoagulants slow the chemical cascade that forms a clot; generic examples include warfarin, apixaban and rivaroxaban. Antiplatelets stop platelets, the tiny cell fragments that plug damaged vessels, from clumping together; aspirin and clopidogrel are the familiar names.

Arthroscopy creates a tension between two risks. Continue the medicine, and blood can pool inside the joint, a hemarthrosis, which is painful and slows rehabilitation. Pause it, and the reason you take it, whether an irregular heart rhythm, a heart stent or a previous clot, resurfaces. Neither risk can be judged from a leaflet. It requires the surgeon, the anesthesia clinician and the prescriber, often a cardiologist, to weigh the specific operation against your specific history.

Mechanism explains why the plans differ. Warfarin works by blocking vitamin K, and its effect builds and fades gradually, so any interruption is measured in days and often checked with a blood test. The newer direct anticoagulants act on a single clotting factor and clear more quickly, so the window is shorter. Aspirin permanently disables the platelets it touches; its effect only fades as the body makes fresh ones, which is why it is sometimes simply continued for small joint procedures. Cleveland Clinic notes that surgeons may ask patients to stop certain blood-thinning medicines before arthroscopy, and the exact instruction varies case by case.

Everyday anti-inflammatories such as ibuprofen and naproxen also blunt platelets, which is why many teams ask you to avoid them beforehand and suggest an alternative for pain in the meantime.

Do not pause or restart any of these on your own. Ask for the plan in writing, including the moment you may resume.

Diabetes medicines and the fasting window

Fasting, anesthesia and the body’s stress response all push glucose around, and diabetes medicines that are perfectly balanced on a normal day can overshoot or undershoot on the morning of an operation. That is why people with diabetes are often given the earliest slot of the day, so the fasting period is as short as possible.

Different classes raise different questions, and each is settled by your prescriber and the anesthesia team rather than by a general rule:

• Insulin lowers glucose whether or not you have eaten, so the amount and timing usually change around fasting. The team will tell you exactly how.
• Metformin reduces the liver’s sugar output and is often held briefly around surgery, particularly if kidney function is a concern or contrast dye is planned.
• SGLT2 inhibitors, which make the kidneys pass sugar into urine, have been linked with a form of ketoacidosis during fasting and illness. Many teams ask that they be paused beforehand.
• GLP-1 receptor agonists, used for diabetes and weight, slow stomach emptying. Anesthesia teams increasingly ask when the last dose was taken, because food lingering in the stomach raises the chance of it entering the lungs during anesthesia.

Bring your glucose meter or sensor on the day. Ask what to do if your reading drops while fasting, since many units allow a specific clear sugary drink up to the clear-fluid cut-off. Ask, too, how the plan changes if the operation is delayed by several hours.

High glucose in the weeks before surgery matters as well as on the day. It slows wound healing and feeds infection, which is one reason a team may ask to wait until control improves.

How long to fast before arthroscopy, and what still counts as food

Fasting has one purpose: an empty stomach. Under general anesthesia or deep sedation the reflexes that normally keep stomach contents out of the airway are switched off. If food or liquid comes back up, it can be inhaled into the lungs, an event called aspiration, which can cause a serious pneumonia. The rules exist for that single, rare, avoidable problem.

The NHS guidance for having an operation is to have no food for 6 hours beforehand and to drink only clear fluids, such as water, until 2 hours before. Many units actively encourage sipping water up to that point, because arriving dehydrated makes veins harder to find and leaves you feeling worse afterwards. Your own letter may give slightly different times; follow it.

What counts is where people slip up:

Item	Usual status	Why
Meals, snacks, milk, yoghurt, smoothies	Stop at the food cut-off	Fat and protein leave the stomach slowly
Water, dilute squash, black tea or coffee without milk	Allowed until the clear-fluid cut-off	Clear liquids empty quickly
Chewing gum, boiled sweets, mints	Treat as food	They stimulate saliva and stomach juices
Alcohol	Usually asked to avoid beforehand	Affects anesthesia and bleeding
Regular medicines	Only as instructed, with a sip of water	Team decides which to continue

Fasting applies even if you are expecting a spinal or a nerve block, because the team must be able to convert to a general anesthetic if needed.

On the morning itself, shower without lotions or oils, leave nail polish and jewelry off, wear loose clothing that fits over a bulky dressing, and bring your medicines in their original packaging.

Anesthesia options and why they shape your journey home

Arthroscopy can be done under several kinds of anesthesia, and the choice determines what you will feel like at discharge. Discuss it at pre-assessment so nothing surprises you in the recovery bay.

A general anesthetic puts you fully to sleep. A spinal injects local anesthetic into the fluid around the lower spinal nerves, numbing you from the waist down while you stay awake or lightly sedated. A regional nerve block numbs one limb by placing local anesthetic around the nerves supplying it, often guided by ultrasound. Local anesthesia with sedation combines numbing around the joint with a relaxing medicine through a vein. Mayo Clinic notes the choice depends on the joint, the planned work and your health.

Each leaves a different footprint:

• After a general anesthetic, judgment, reaction time and memory are affected well beyond the point where you feel awake. The NHS advises not driving, operating machinery, drinking alcohol or signing legal documents for 24 hours, and sometimes longer.
• A nerve block can leave the limb numb and weak for many hours. That is welcome for pain, but a leg you cannot feel is a leg you cannot trust on stairs or crutches.
• Sedation is sneaky. People feel clear-headed and are not. The same 24-hour rules apply.

None of these is compatible with getting yourself home. Not by car, not alone on a bus, and not by walking, however close you live. The next section turns that principle into a plan.

One practical point: if you have had nausea after a previous anesthetic, say so. Anti-sickness measures are easier to build in before than to chase afterwards.

Arranging a ride home after arthroscopy: what your team will expect

The rule is simple and firm. A responsible adult collects you, travels with you, and stays with you for the first night. The NHS advises arranging for someone to stay with you for 24 hours after a general anesthetic, and most day-surgery units will not discharge, and some will not start, without a confirmed name and phone number.

The companion’s job is more than driving. They hear the discharge instructions while your memory is still patchy, help you from the car to the door, watch for problems in the first hours, and can call for help if something changes overnight. That is why an unaccompanied taxi ride is generally not accepted even when the fare is no obstacle.

Practical details make the trip easier:

• Choose the front passenger seat, pushed back and slightly reclined, so a bandaged knee or a shoulder sling has room.
• For a knee or hip, a taller vehicle is easier to get into than a low sports car; you back in, sit, then swing the leg.
• Keep a pillow in the car to support the limb, and a bag in case of nausea.
• Have crutches or a sling fitted and practiced before you leave the unit, not in the parking lot.

If you live alone, say so early. Options include a friend or relative staying over, you staying at theirs, or, in some units, an overnight admission arranged in advance. It is far easier to solve at pre-assessment than at four in the afternoon on the day.

Driving yourself is off the table for the 24 hours the NHS specifies, and often longer for the operated leg, because braking in an emergency needs full strength and feeling.

Preparing for arthroscopy at home: what to set up before you leave

The most useful hour of preparing for arthroscopy may be the one spent walking through your own home as if you already had a bandaged joint and one useful arm or leg. Where do you sit? How do you reach the kettle? Which rug will catch a crutch?

Set up before you go:

• a resting spot with the limb raised on cushions, a side table for water and the phone charger, and the remote within reach;
• ice packs or bags of frozen peas in the freezer, plus a thin towel to protect skin;
• meals that need one hand and no chopping, cooked ahead or bought ready;
• a clear path from bed to bathroom, loose rugs rolled away, night lights on the route;
• a shower stool or a plan for keeping the dressing dry, since most teams ask that it stay dry until the first wound check;
• a bed on the ground floor if stairs are a problem in the first days;
• pets and children organized so no one is pulled on or tripped over;
• a notebook for questions and for recording pain relief timing as instructed.

Pack a small bag for the day: your written medicine list and instructions, medicines in original packs, glasses rather than contact lenses, a phone and charger, loose trousers or a shirt that opens at the front for shoulder surgery, and flat shoes with a back that grip. Leave valuables at home.

Tell your employer the realistic picture. Desk work often restarts within days, physical work takes longer, and pretending otherwise puts pressure on a joint that is trying to heal. Your surgeon can give a range specific to your job and your repair.

Arthroscopy recovery time: what the first days and weeks usually look like

Recovery is not a single date but a series of stages, and the pace depends heavily on which joint was treated and what was done inside it. Trimming a small meniscal tear and stitching a torn shoulder labrum are both arthroscopies; their timelines are very different. The ranges below are typical, drawn from NHS and Mayo Clinic patient guidance, and your team will tailor them.

The first two days are about swelling and the fading of anesthesia. The joint feels tight from the fluid used during surgery, the dressing is bulky, and a nerve block may wear off overnight, sometimes abruptly. Rest with the limb raised, use ice as instructed, and take the pain relief plan seriously before pain builds rather than after. Gentle movement of the fingers or toes and short, supported walks reduce clot risk.

Within the first week or two, dressings are usually changed or removed, stitches come out or dissolve, and the physiotherapy program begins in earnest. This is where outcomes are shaped. Exercises restore range of motion and wake up muscles that switch off around a swollen joint.

The NHS notes that most people can return to normal activities within a few weeks, though heavier work and sport take longer, and some repairs require the joint to be protected for a set period first. Driving resumes when you can perform an emergency stop confidently and your surgeon agrees, which is usually later for the right leg than the left in countries where the right foot brakes.

Throughout, hydration, walking and calf pumps matter. Deep vein thrombosis, a clot in a leg vein, is uncommon after arthroscopy but is the complication that turns a small operation into an emergency, which is why its signs anchor the final section.

What people often get wrong about preparing for an arthroscopy

Keyhole means trivial. It does not. The cuts are small; the anesthesia, the fluid in the joint and the healing tissue are not. Planning for a full day of feeling unwell and a week of limited use is realistic, not pessimistic.

Fasting from midnight is safest. Longer is not better. Prolonged fasting causes dehydration, headaches and low blood sugar, and it makes recovery feel worse. The NHS times of 6 hours for food and 2 hours for clear fluids exist because they balance safety and comfort. Follow the times on your letter rather than rounding up.

Nothing at all by mouth means no water. In most units, water is welcome until the clear-fluid cut-off, and regular medicines the team has told you to continue are taken with a sip.

Stopping the blood thinner is the cautious choice. Pausing an anticoagulant without a plan can be the more dangerous move, because the condition it protects against does not pause with it. The decision belongs to your surgeon and prescriber together.

Supplements are not medicines. Several herbal products affect bleeding or anesthesia. They belong on the list.

A taxi will do. It usually will not. The requirement is a responsible adult who stays, not a vehicle.

It is my left leg, so I can drive home. Anesthesia, not the leg, is the reason for the 24-hour driving rule.

I will feel normal by evening. Many people feel foggy, nauseated or unexpectedly emotional the first night; that is a normal anesthetic hangover, not a sign of a problem, unless red flags appear.

Pain relief should wait until it hurts. Staying ahead of pain in the first days, exactly as instructed, makes the physiotherapy that follows possible.

Questions to ask your care team before the day

A good pre-assessment is a conversation, not a form. Arrive with questions written down, because the answers are easier to remember than the ones you meant to ask. These are the ones that most often change how the day and the weeks after go.

• What exactly do you expect to find and to do inside the joint, and what is the plan if you find something different?
• Which of my medicines and supplements should I continue, which should I pause, and when do I restart each one? Could I have that in writing?
• Who is deciding about my blood thinner, and has my cardiologist or prescriber been involved?
• What are my fasting times, and can I drink water up to the clear-fluid cut-off?
• Which type of anesthesia are you planning, and what will my limb feel like when I wake?
• If the operation is delayed on the day, how do my fasting and medicine plans change?
• What kind of dressing will I have, when can it get wet, and who removes stitches?
• What does a normal amount of pain and swelling look like in the first 48 hours, and what would worry you?
• When does physiotherapy start, and is there anything I should practice beforehand?
• When am I likely to be able to drive, return to my specific job, and return to my sport?
• Do I need any clot-prevention measures, and what signs of a clot should I watch for?
• Who do I call out of hours if something changes, and what is the number?

If an answer is a range rather than a number, that is honesty, not evasion. Healing varies, and a team that says so is one worth trusting with the rest of the plan.

When to call your doctor

Before the operation, contact the pre-assessment team if you develop a cold, cough, fever, vomiting or diarrhea in the days beforehand; if the skin over the joint is cut, grazed, bitten or infected; if you have started, stopped or run out of any medicine; if there is any chance you are pregnant; or if you have simply lost track of a fasting or medicine instruction. A quick call is far better than a cancelled slot or an avoidable complication.

After the operation, call your surgical team or your usual doctor the same day if you notice:

• fever, chills, or feeling generally unwell;
• redness spreading away from the cuts, warmth, increasing swelling or pus;
• a dressing soaked through with blood, or a wound that has opened;
• pain that keeps climbing despite the plan you were given, or a joint that suddenly becomes hot and tense;
• numbness, tingling or weakness lasting longer than the team said a nerve block would;
• persistent vomiting, or inability to pass urine many hours after a spinal anesthetic;
• calf pain, tenderness or swelling in one leg, which can signal a deep vein thrombosis.

Call emergency services immediately, do not drive yourself, if you develop sudden shortness of breath, chest pain, coughing up blood, a racing heart with faintness, or one-sided weakness or slurred speech. These can indicate a clot that has traveled to the lungs or a stroke, both of which need urgent hospital treatment.

When in doubt, call. Discharge teams expect these calls, and the ones that turn out to be nothing are still worth making.

Frequently asked questions

How long do I have to fast before an arthroscopy?

The NHS standard for operations is no food for 6 hours beforehand and clear fluids only, such as water, until 2 hours before. Your hospital letter gives the exact times for your slot and those override any general figure. Fasting also applies if you expect a spinal or nerve block, because the team must be able to switch to a general anesthetic if needed.

Can I drink water on the morning of my arthroscopy?

Usually yes, up to the clear-fluid cut-off your unit sets, commonly 2 hours before the procedure under NHS guidance. Many teams encourage sipping water until then because arriving dehydrated makes veins harder to find and recovery feel worse. Milk, juice with pulp and anything with food in it stop at the earlier food cut-off. Check your letter for the specific times.

Should I stop blood thinners before arthroscopy?

Never on your own. Whether to continue, pause or bridge an anticoagulant or antiplatelet medicine is a joint decision between your surgeon, the anesthesia team and the clinician who prescribed it, weighing bleeding inside the joint against the clot or stroke risk the medicine prevents. Ask for the plan in writing, including exactly when to restart.

Do I need someone to drive me home after arthroscopy?

Yes. After general anesthesia or sedation you cannot drive, and most day-surgery units require a responsible adult to collect you and stay with you for the first 24 hours, in line with NHS advice. That person hears the discharge instructions, helps you move safely and can call for help overnight. An unaccompanied taxi ride is generally not accepted.

Can I take my usual medicines on the day of surgery?

Only as your pre-assessment team instructed. Many blood pressure and heart medicines are continued with a sip of water, while some diabetes medicines, blood thinners and anti-inflammatory painkillers are commonly paused or adjusted. The written list you received at pre-assessment should name each medicine and say continue, pause or last take. If it is unclear, phone the unit before the morning.

What happens with diabetes medicines while I am fasting?

Your prescriber and anesthesia team will give a specific plan, because fasting and surgical stress shift glucose. Insulin timing usually changes, metformin is often held briefly, SGLT2 inhibitors are commonly paused because of ketoacidosis risk during fasting, and GLP-1 receptor agonists prompt questions about your last dose. Bring your glucose meter and ask what to do if readings fall while fasting.

Do supplements and herbal remedies matter before arthroscopy?

They do. Ginkgo, garlic, ginseng and high-dose fish oil can increase bleeding, and St John’s wort changes how the liver processes anesthetic drugs. Vitamins and protein powders are less of a concern but still belong on your list so the team sees the whole picture. Tell them everything you take and let them decide what to pause.

How long is arthroscopy recovery time?

It depends on the joint and what was repaired. The NHS notes that most people return to normal activities within a few weeks, with heavier work and sport taking longer and some repairs requiring a protected period first. The first two days are about swelling and the anesthetic wearing off; physiotherapy over the following weeks shapes the final result.

When can I drive after arthroscopy?

Not for at least 24 hours after a general anesthetic or sedation, per NHS guidance, and often longer if the operated limb is needed for braking or steering. You should be able to perform an emergency stop confidently, without pain or hesitation, and your surgeon should agree. Check your insurance policy too, since some require surgical clearance.

What should I bring to the hospital for a day-case arthroscopy?

Bring your written medicine list and pre-assessment instructions, all medicines in their original packaging, glasses rather than contact lenses, a phone and charger, and loose clothing that fits over a bulky dressing or sling. Flat, grippy shoes with a back help on crutches. Leave valuables at home and confirm your companion’s name and number for the discharge team.

References

• NHS: Arthroscopy
• NHS: Having an operation (surgery) – Preparation

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.