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What is knee osteoarthritis?
Osteoarthritis is not simply wear and tear. It involves the whole joint: cartilage thins, the bone underneath changes, bony spurs form and the joint lining may become inflamed. The process usually develops slowly over years. Symptoms often fluctuate, with good and bad spells, and do not always match how the knee looks on X-ray.
Who is at risk?
Risk increases with age. Other factors include being overweight, previous knee injury or surgery (such as a meniscus or ligament injury), a bowed or knock-kneed alignment, a family history, female sex and jobs involving heavy kneeling or lifting. Some of these factors, particularly body weight and muscle strength, can be changed. Protecting the knee after an injury, with proper assessment and rehabilitation, may also matter, because earlier damage to the meniscus or ligaments can make arthritis more likely later in life.
What are the symptoms?
- Pain on walking, climbing stairs or rising from a chair.
- Stiffness, especially in the morning or after sitting, usually easing within half an hour.
- Swelling and a grinding feeling.
- Reduced bending, making squatting or sitting cross-legged difficult.
- Gradual change in leg alignment in some people.
How is it diagnosed?
Knee osteoarthritis is often diagnosed from symptoms and examination in people over middle age. Standing X-rays show joint space narrowing and bony spurs, and help plan treatment. MRI is not usually needed but may be used when another problem is suspected. Blood tests may be advised if inflammatory arthritis is a possibility.
Evidence-based management: first steps
Core treatments are recommended for everyone with knee osteoarthritis, whatever its stage:
- Education: understanding the condition and that movement is generally safe and helpful.
- Exercise and physiotherapy: strengthening the thigh and hip muscles, improving flexibility and staying active, for example walking, cycling or water exercise.
- Weight management: losing weight, if overweight, can reduce pain and improve function.
Additional measures include pain relief chosen and reviewed by your doctor (dosing and choice depend on your health and other medicines), suitable footwear, a walking stick and adapting activities.
Injections and surgery
Injections
In selected cases, a steroid injection may give short-term relief during a flare. Other injections are sometimes offered; the evidence for them is mixed, and your doctor can explain what is known.
Osteotomy
For younger, active people with arthritis mainly on one side of the knee, a high tibial osteotomy realigns the leg to shift load to the healthier side and preserve the natural joint.
Joint replacement
When symptoms remain severe despite other treatment, a partial knee replacement may suit arthritis limited to one compartment, while a total knee replacement is used for more widespread damage.
Arthroscopic washout or trimming for osteoarthritis alone is generally not recommended.
Living well with knee osteoarthritis
Knee osteoarthritis is a long-term condition, and day-to-day habits often make a real difference. Helpful approaches include:
- Pacing: spreading demanding tasks through the day and week rather than doing everything at once.
- Managing flares: reducing activity for a few days, using ice or warmth, then gradually returning to exercise.
- Staying active: regular walking, cycling or water exercise within comfort.
- Home adjustments: a chair of suitable height, a raised toilet seat or a rail on the stairs.
- Footwear: comfortable, cushioned shoes with good support.
- Sleep and mood: poor sleep and low mood can make pain feel worse; mention them to your doctor.
Be cautious about products that promise to cure or regrow cartilage. Ask your doctor about the evidence before spending money on them, and tell them about any supplements you already take.
How does treatment change over time?
Treatment is usually stepped. Core measures continue throughout. If they are not enough, additional options are added, and surgery is considered only when symptoms remain significant despite good non-surgical care. Many people never need surgery, while others reach a stage where it offers a better quality of life.
Regular review allows the plan to be adjusted as your needs change. Factors such as worsening night pain, shrinking walking distance, increasing deformity or loss of independence are useful signals to discuss with your doctor. Our guide on when knee replacement surgery is needed covers this stage in more detail.
When should you seek help?
See an orthopaedic specialist if knee pain is persistent, limits walking or sleep, or is not improving with exercise and simple measures.
When to seek urgent care: go to the nearest emergency department if your knee becomes suddenly hot, red and very swollen, especially with fever, as this may indicate infection.
Discuss your situation with Dr. Karnav Panchal to plan a knee care approach that fits your stage and goals.
Common questions
Can knee osteoarthritis be reversed?
Cartilage changes are not usually reversible, but symptoms can often be improved considerably with exercise, weight management and other treatments.
Is walking good for knee arthritis?
Regular walking within comfort is generally beneficial. If walking is painful, cycling or water exercise may be easier while strength improves.
Are knee supports or braces helpful for osteoarthritis?
Some people find a simple support or a specialised brace helpful, especially when arthritis affects one side of the knee. A physiotherapist or doctor can advise whether one suits you.
Do I need an MRI for knee arthritis?
Usually not. Standing X-rays and examination are often enough. MRI may be used if another problem is suspected.
Related treatment page: Knee Injuries & Knee Care. To talk about your own symptoms, request a consultation.