Arthritis causes the cartilage that covers the ends of the bones in your joints to wear away. Cartilage is a flexible tissue that helps your joints move smoothly. When it wears away, your joints become inflamed, painful and stiff.
Arthritis can affect any joint but often affects the hands, hips, knees and spine. The knee is made up of three main bones and contains two types of cartilage that are affected by knee arthritis: hyaline cartilage that covers the ends of the bones that form the knee joint and fibrous cartilage that forms two C-shaped discs called menisci.
There are different types of arthritis that can affect the knee. The treatment you receive will depend on the type of arthritis you have.
Osteoarthritis is the most common cause of knee arthritis. It occurs due to wear and tear of the cartilage covering the bones in your knee joint over time. As the cartilage wears down, the bones in your knee joint rub together, which causes pain. This can also cause painful bone spurs to form that can further restrict the movement of your knee joint.
Rheumatoid arthritis is an autoimmune condition (a condition where your body’s immune system mistakenly attacks healthy tissue) that affects the cartilage in your joints. In your knee, rheumatoid arthritis causes swelling, weakening of your knee bones, and if left untreated destruction of your knee joint.
Gout is a type of inflammatory arthritis caused by excessively high levels of uric acid in your body. Uric acid is produced by your body when it breaks down purines — a chemical involved in many processes in your cells and that is also found in certain foods.
High levels of uric acid cause needle-shaped crystals of uric acid to build up in your joints, causing them to become inflamed, painful and swollen. Joints commonly affected include your toe joints, ankles and knees. Other symptoms include kidney stones and lumps under your skin.
Post-traumatic arthritis develops after a knee injury, which causes excess wear and tear of your knee joint — this leads to secondary osteoarthritis. Symptoms include swelling and pain in your affected knee.
Knee arthritis symptoms usually worsen over time. Symptoms can come on gradually or suddenly, depending on the cause. In the later stages of knee arthritis, you may notice deformities in your knee that severely limit your ability to move your knee joint.
Signs of arthritis in the knee include:
Knee osteoarthritis symptoms include:
Knee rheumatoid arthritis symptoms include:
In addition to symptoms that specifically affect your knee, you may also notice other symptoms including:
Knee gout symptoms include:
Symptoms of post-traumatic knee arthritis include:
Knee osteoarthritis is caused by overuse of your knee joint, which leads to wear and tear of the cartilage in your knee over time. It therefore usually occurs after age 50.
It isn’t known what causes rheumatoid arthritis but it may be linked to your genetics or triggered by stressful or emotional events. Other risk factors include drinking a lot of coffee, eating a lot of red meat, infections, injuries and smoking.
Risk factors for developing gout include:
This is caused by an injury to your knee (eg sprain or cartilage tear) that causes excess wear and tear.
If you have knee discomfort, pain, stiffness or tenderness, see your GP. They will ask you about your symptoms, medical history and whether you have previously injured your knee. They will also perform a physical examination of your knees — this may involve you walking so they can check your range of movement.
Your GP will also check for signs of arthritis elsewhere in your body. Arthritis can affect other joints in your body and depending on the cause, can affect one or both of your knees.
They may recommend tests to rule out other causes of your symptoms. This may include imaging tests, such as an X-ray to check for damage to the bones in your knee or a CT scan or MRI scan to check for damage to the soft tissues in and around your knee.
If your GP suspects that you have rheumatoid arthritis they may recommend blood tests to detect certain proteins commonly present in people with the condition. If they suspect gout, a blood test can be used to measure your uric acid levels.
In the early stages of knee arthritis, over-the-counter painkillers, home remedies and self-care approaches are often effective to reduce your symptoms. If your arthritis becomes more severe, your doctor may recommend stronger medications and in the most severe cases, surgery.
If you have arthritis, knee pain treatments you can do at home include:
Some alternative therapies, such as acupuncture and balneotherapy, claim to provide relief from arthritis. However, there is no conclusive evidence to suggest these therapies work.
If home remedies don’t ease your knee arthritis symptoms, your doctor may prescribe medication to help. All medications have side effects, which your doctor will discuss with you before you start taking them. Your doctor may prescribe:
If you have rheumatoid arthritis and these medications are not effective, your doctor may prescribe disease-modifying antirheumatic drugs (DMARDs). DMARDs affect your whole body — this is helpful when treating rheumatoid arthritis as it is an autoimmune condition and therefore can affect your whole body. DMARDs include:
For short-term pain relief, your doctor may also recommend a corticosteroid injection.
In severe cases of knee arthritis, where your knee joint is badly damaged, knee arthritis surgery may be needed. This is only recommended if all other treatments have failed to work.
There are different surgeries depending on the extent and location of the damage to your knee. They include:
On average it takes two to six weeks to fully recover from knee arthroscopy surgery.
Whether you have partial or total knee replacement surgery, recovery can take up to two years. Pain and swelling will usually get better in the three months after surgery. Over the next two years, exercise will be needed to help heal scar tissue and strengthen your knee muscles.
There are several things you can do to help prevent arthritis in your knees, including:
What does arthritis in the knees feel like?
Arthritis in your knees can feel like a dull, throbbing ache. If your inflammation flares up, your knees may also feel warm and tender.
Is walking good for arthritis in the knee?
Yes, if you can, walking is good for knee arthritis as it helps strengthen the muscles that support your knee without putting too much strain on your knees like running does.
What is the best exercise for arthritic knees?
Low-impact exercises and stretching are best for arthritic knees as they improve the flexibility and strength of the muscles that support your knees. Exercises you can try include yoga, Pilates, walking and swimming.
Is arthritis in the knee permanent?
Knee arthritis is usually a long-term condition. However, depending on the type of knee arthritis you have, you may go for months or even years without any flare-ups in your symptoms.
What are the five worst foods to eat if you have arthritis?
Foods that promote inflammation can worsen your arthritis symptoms, so it is best to avoid them or limit your intake. Pro-inflammatory foods include foods high in omega-6 fatty acids (eg corn oil, which is often found in margarine), salt, saturated fats (eg dairy and red meat), sugar and trans fats (eg fried and processed foods).
Is it better to heat or ice a knee with arthritis?
In general, heat loosens up muscles and helps relieve joint stiffness, while cold reduces swelling and inflammation. You can therefore choose the approach that best matches the symptoms you want to relieve.
Are eggs bad for arthritis?
Eggs are not bad for arthritis. They contain vitamin D which regulates inflammation and are anti-inflammatory.
How can I naturally lubricate my knees?
You can’t naturally lubricate your knees. However, you can maintain good joint health by eating a balanced diet that ensures you get enough calcium, vitamins D and K, and omega-3 fatty acids, which all support strong and healthy joints.
What is the best vitamin for arthritis?
Arthritis can affect the bones and cartilage in your joints. Vitamins that support the health of your bones and cartilage may therefore be helpful. Vitamins D and K support bone strength and vitamin K supports cartilage structure. However, if you have arthritis, you should speak to your doctor before taking any supplements.
What are the signs of needing a knee replacement?
Signs that you may need a knee replacement include visible deformities in your knee, pain that disturbs your sleep and symptoms that prevent you from carrying out daily activities, including work and hobbies.
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Lux has a BSc(Hons) in Neuroscience from UCL, a PhD in Cellular and Molecular Biology from the UCL Institute of Ophthalmology and experience as a postdoctoral researcher in developmental biology. She has a clear and extensive understanding of the biological and medical sciences.Having worked in scientific publishing for BioMed Central and as a writer for the UK’s Medical Research Council and the National University of Singapore, she is able to clearly communicate complex concepts.
Alfie Jones, Director — Cahoot Care Marketing
Alfie has a creative writing degree from UCF and initially worked as a carer before supporting his family’s care training business with copywriting and general marketing.He has worked in content marketing and the care sector for over 10 years and overseen a diverse range of care content projects, building a strong team of specialist writers and marketing creatives after founding Cahoot in 2016.