What is knee pain?
Having sore knees is common and isn’t usually a sign of anything serious. There are many possible causes, which can range from a simple muscle strain or tendonitis, to some kind of arthritis. Sometimes a cause can’t be found.
Knee pain can often be treated at home and you should start to feel better after a few days.
As you age, getting knee pain may become more common. You’re also more at risk of getting knee pain if you are overweight. Knee pain may sometimes be the result of a sports or other injury.
How is the knee structured?
The knee is the largest joint in your body.
It is made up of four main things: bones, ligaments, cartilage and tendons.
Your knee joint is formed where three bones meet. These are your:
- thighbone, which is also known as the femur
- shinbone, which is also known as the tibia
- kneecap, which is also known as the patella.
These join bones to other bones. There are four main ligaments in your knee. They act like strong ropes to hold your bones together and keep your knee in place.
These ligaments in your knee are:
- Collateral ligaments – which are found on the sides of your knee. One is on the inside and one is on the outside. They control the sideways movement of your knee.
- Cruciate ligaments – which are found inside your knee joint. They cross each other to form an X shape. These ligaments control how your knee moves backwards and forwards.
There are two types of cartilage in your knee:
This covers the ends of your thighbone and shinbone, and the back of the kneecap. This is a slippery substance that helps your knee bones glide smoothly across each other as you bend or straighten your leg.
Meniscal cartilage (meniscus)
These are two wedge-shaped pieces that act as shock absorbers between your shinbone and thighbone.
The medial meniscus is on the inner side of the knee joint.
The lateral meniscus is on the outer side of the knee.
The meniscus helps to cushion and stabilise the joint, which is why they are tough and rubbery. When people say they have torn cartilage in the knee, they are usually talking about torn meniscus.
These connect muscles to your bones.
Sprains, strains and tears are all types of knee injury. These can be caused by sports injuries, but you don’t have to be sporty to have this type of knee pain.
Sore or painful knees can be a sign of tendonitis.
This is when a tendon swells up and becomes painful - for example, after an injury. Visit the NHS website for more information on tendonitis.
This is a condition that can affect children and young people. In Osgood-Schlatter’s disease, the bony lump below your knee cap becomes painful and swollen during and after exercise.
Patellofemoral pain syndrome
This is a common knee problem, that particularly affects children and young adults. People with patellofemoral pain syndrome usually have pain behind or around the kneecap.
Pain is usually felt when going up stairs, running, squatting, cycling, or sitting with flexed knees.
Exercise therapy is often prescribed for this condition.
Could my knee pain be arthritis?
Knee pain can develop gradually over time, might come on suddenly, or might repeatedly come and go. Whatever pattern the pain has, it is most often not due to arthritis, but might be in some people.
Osteoarthritis is the most common type of arthritis. It can affect anyone at any age, but it is most common in people over 50.
If you have osteoarthritis of the knee, you might feel that your knee is painful and stiff at times. It might affect one knee or both.
The pain might feel worse at the end of the day, or when you move your knee, and it might improve when you rest. You might have some stiffness in the morning, but this won’t usually last more than half an hour.
Pain from osteoarthritis might be felt all around your knee, or just in a certain place, such as the front or side. It might feel worse after moving your knee in a particular way, such as going up or down stairs.
Balancing rest and exercise
During the first 24 to 48 hours after your knee problem has started, you could:
- rest your knee, but avoid having long periods where you don’t move at all
- when you are awake, move your knee gently for 10 to 20 seconds every hour.
After 48 hours:
- Try to use your leg more, as exercise can help with long-term pain.
- When going upstairs, lead with your good leg. Use the handrail, if there is one.
- When going downstairs, lead with your sore leg. Use the handrail, if there is one.
- Try to stick to your normal routine, if you can, as this can help your recovery. This includes staying at, or returning to, work.
Avoid heavy lifting until your pain has gone down and you have good range of movement in your knee.
Low-impact exercise, such as cycling and swimming, can be useful when recovering from a knee injury.
You can also try the exercises we recommend for knee pain.
Carrying extra body weight makes it more likely that you will get joint pain in the first place. If you have joint pain already, being overweight can make it worse. Losing even a small amount of weight can make a big difference to knee pain.
The NHS has a weight loss plan that is designed to help you lose weight at a safe rate each week, by sticking to a daily calorie allowance.
Heat is an effective and safe treatment for most aches and pains. You could use a wheat bag, heat pads, deep heat cream, hot water bottle or a heat lamp.
Gentle warmth will be enough – there is a risk of burns and scalds if the item is too hot. You should check your skin regularly, and you should try to place a towel between the item and your skin.
Heat should not be used on a new injury. Doing this might increase bleeding under the skin and could make the problem worse.
Try not to have the heated item on your skin for longer than about 20 minutes.
Many people find that ice is helpful when used to manage short-term knee pain. Ice packs can be made from ice cubes placed in a plastic bag, or wet tea towel. You could also use a bag of frozen peas, or buy a ready-made pack from a pharmacy.
Rub a small amount of any type of oil over where the ice pack is to be placed. If the skin is broken, or you have stitches, do not cover in oil. Instead, protect the area with a plastic bag, as this will stop it getting wet.
Place a cold, wet flannel over the oil. You do not need to do this if using a plastic bag.
Put your ice pack over the flannel.
Check the colour of your skin after 5 minutes. If it is bright pink or red, remove the ice pack. If it is not pink, leave it on for another 5 to 10 minutes.
Ice can be left on for 20 to 30 minutes – if it is left on for longer, there is a risk of damaging the skin. This can be repeated every 2 to 3 hours.
Examples include sensible shoes and arch supports if you have flat feet.
If you need a painkiller, you might take paracetamol regularly, for a few days.
Non-steroidal anti-inflammatory drugs – tablets
These can help with pain, inflammation and swelling. There are many types and brands. Some, such as ibuprofen, don’t need a prescription. This means you can buy them over the counter, at supermarkets and pharmacies.
Other types of anti-inflammatory painkillers do need a prescription. NSAIDs carry a number of potential side effects, so you should ask your doctor or pharmacist if they are suitable for you before taking them. You can also read the patient information leaflet that comes in the packet.
Non-steroidal anti-inflammatory drugs – rub-on painkillers
These are also called topical painkillers. Some can be bought over the counter, at pharmacies, while others need a prescription. It is unclear whether rub-on anti-inflammatory painkillers work better than tablets. However, the amount of the medication that gets into your bloodstream is much less with rub-on painkillers, and there is less risk of side effects.
When to see a doctor
Knee pain will usually go away without further medical treatment, using only a few self-help measures.
If you need help you might first see a physiotherapist or your GP.
You may be able to access a physiotherapist on the NHS without having to see your GP. You can find out if this kind of `self-referral’ is available in your area by asking at your GP surgery, local Clinical Commissioning Group, or hospital Trust.
You might also have the option of paying to see a physiotherapist privately. You don’t need a referral from a doctor to do this. You might wish to see your GP if the pain is very bad or is not settling.
See a doctor if:
- you’re in severe pain
- your painful knee is swollen
- it doesn’t get better after a few weeks
- you can't move your knee
- you can’t put any weight on your knee
- your knee locks, clicks painfully or gives way – painless clicking is not unusual and is nothing to worry about.
It’s important not to misdiagnose yourself. If you’re worried, see a doctor.
Your doctor will often be able to diagnose your knee problem from your symptoms along with a physical examination of your knee. Occasionally, they may suggest tests or a scan to help confirm a diagnosis – especially if further, more specialised treatment may be needed.
If your pain doesn’t go away, your doctor may suggest treatments to tackle the underlying cause of your knee pain. This may involve trying to make your hip muscles stronger, or help with foot problems, each of which can affect knee pain.
A doctor will suggest treatment based on the condition that’s causing your pain.
If your pain is severe, you may be prescribed stronger painkillers such as codeine. Because this has more side effects than standard painkillers, it may only be prescribed for a short time and your doctor will probably suggest other treatments to tackle the causes of your pain.
Physiotherapy may help your knee pain, depending on what has caused it and what part of your knee hurts. A physiotherapist can give advice tailored to your individual situation.
Treatments your physiotherapist may suggest include:
- a programme of exercises tailored to your particular needs – depending on what’s causing your knee pain, this may need to last for a while
- taping of the kneecap – this involves applying adhesive tape over the kneecap to change the way your kneecap sits or moves
- knee braces – you can buy these from sports shops, chemists and online retailers, but they’re not suitable for everyone or for all knee problems. Speak to your doctor or physiotherapist, if you want to know whether a brace is suitable for you.
Talking therapies and pain management programmes
Knee pain can affect your mood, especially if it lasts a long time, and feeling low can make your pain worse. If you’re feeling low or anxious, it’s important to talk to someone. This could be a neighbour, relative, friend, partner, doctor, or someone else in the community.
Talking therapies can also be useful for some people. You may be offered counselling on the NHS if you are struggling with long-term pain.
Counselling on the NHS usually consists of 6 to 12 sessions. You can also pay for counselling privately.
Pain management programmes can also be useful, as they help you to build on your ability to live well when you’re in pain.
ESCAPE-pain is a rehabilitation programme for people living with long-term pain that combines building upon your coping strategies, together with a tailored exercise programme for each person. The programme is delivered to small groups of people twice a week, for six weeks, and is run in many locations across the UK.
Surgery or injections
Surgery or injections into the knee are not recommended as a treatment for most types of knee pain. This is because people often recover as well, or better, with non-invasive treatments.
An injection is unlikely by itself to be a cure. Also, not all knee problems can benefit from injections, and injections might themselves occasionally cause side effects.
If you have osteoarthritis of the knee and it’s causing you a lot of pain and difficulty with everyday activities, then your doctor may refer you to a surgeon to discuss knee replacement surgery. You can find out more about this in our ‘Osteoarthritis of the knee’ and ‘Knee replacement surgery’ content.
Working with knee pain
If you have a job, it’s important to continue working if you can. Speak to your employer about any practical help they can offer. This might include home working, different hours, adjustments to your workplace or something else.
If you do need to take some time off, then getting back to work sooner rather than later can help your recovery.
You don’t need to wait until your knee problem has completely gone to do this.
It’s important to keep in contact with your employer and discuss what can be done to help you return to work. If your work involves heavy lifting or other physically demanding tasks, you might need to do lighter duties or fewer hours for a while.
If you have an occupational health advisor through your job, they can help suggest what work you are fit to do and arrange any simple adjustments to your work or workplace to help you stay in work.
You can ask for a workplace assessment and tell whoever carries it out about your knee pain. When working, try to take regular breaks, and have a stretch and walk around. Perhaps set a timer on your phone or computer to remind you to do this.
If you’re having any difficulties travelling to or from work, or need an item of equipment, the Government’s Access to Work Scheme might be able to help.
Research and new developments
Versus Arthritis is supporting a number of research projects in the area of knee pain, including:
- A Centre of Research Excellence in Arthritis Pain at the University of Nottingham which is investigating mechanisms of knee pain in order to find ways to better treat it in the future.
- A project based at the University of Oxford which is investigating whether it is possible to predict risk of knee pain and painful osteoarthritis following knee joint injury.
- A project based at Keele University which hopes to identify biological markers that can be used to predict which people with knee cartilage damage will respond well to cell repair therapies, and also find out why some people do not respond well to this treatment, allowing patients, doctors and surgeons to make more informed treatment decisions.
- A clinical study, based at the University of Manchester, which aims to find out whether denosumab, a drug used in the treatment of osteoporosis, can reduce the severity of knee pain and bone marrow changes in people with osteoarthritis.
Keeping active is an important part of your treatment and will help your recovery.
Being physically active while recovering from knee pain can:
- stop the pain from happening again
- help to maintain your current fitness level – even if you make changes to how you do things, any activity is better than none
- keep your other muscles and joints strong and flexible.
It’s important to keep the muscles around the knee strong, as this will take the strain off your knee. These muscles include the thigh, calf and hip muscles.
This section contains some simple exercises that are designed to stretch, strengthen and stabilise your knee.
It might help to go through these exercises with a physiotherapist at first, or they might be able to give you a personalised exercise plan.
Knee stretching exercises
Try to do these exercises every day.
Straight-leg raise (sitting)
Sit with good posture in a chair. Straighten one of your legs, hold for a slow count to 10 and then slowly lower your leg. Repeat 10 times with each leg. Try to get into the habit of doing this exercise every time you sit down.
Lie down on your back with a rolled-up towel under the ankle of your affected leg. Bend the other leg at the knee. Use the muscles of your straight leg to push the back of your knee firmly towards the bed or the floor. Hold for a slow count of five.
Repeat at least five times with each leg. This exercise helps to prevent your knee from becoming permanently bent. Try to do this at least once a day when lying down.
Sit on the floor with your legs stretched out straight in front of you. Slowly bend one knee up towards your chest, sliding your foot along the floor, until you feel a gentle stretch. Hold for five seconds. Straighten your leg as far as you can and hold in this position for five seconds.
Repeat 10 times with each leg. If you can’t get down onto the floor, sit on a sofa and use a board or tea tray as a surface to slide your foot along.
Knee strengthening exercises
The following exercises might be quite hard to do, so try to do them two to three times a week.
Straight-leg raise (lying)
Lie down and bend one of your legs at the knee. Hold your other leg straight and lift your foot just off your bed or floor. Hold for a slow count of five, then lower. Do this until you cannot do any more, rest for a minute, then do this a further three times.
Step onto the bottom step of stairs with your right foot. Bring up your left foot, then step down with your right foot, followed by your left foot. Hold on to the bannister if necessary. Repeat with each leg until you can’t do any more. Rest for one minute and then repeat this another two times. As you improve, use a higher step, or take two at a time.
Hold onto a chair or work surface for support. Squat down until your kneecap is directly over your big toe. Your knees should not go in front of your toes. Return to your normal standing position.
Repeat until you can’t do anymore, rest for one minute, then repeat another two times. As you improve, try to squat a little further, but don’t bend your knees beyond a right angle.
Sit on a chair. Without using your hands for support, stand up and then sit back down. Make sure each movement is slow and controlled. Repeat until you can’t do anymore.
Rest for one minute then repeat another two times. If the chair is too low, start with rising from a cushion on the seat and remove when you don’t need it any more.