HiA content is written by people who have worked inside Singapore's private healthcare system, and reviewed by qualified doctors before it is published.
We use peer-reviewed medical research, Ministry of Health guidance, and the direct clinical knowledge of our reviewers. We have no commercial interest in steering you toward a particular clinic, specialist, or treatment.
Key Takeaways
- Knee osteoarthritis is a degenerative joint disease that occurs when the cartilage cushioning the knee joint gradually wears down, making it the most common form of arthritis affecting the knee.
- Common factors that increase the risk of knee osteoarthritis include ageing, repeated stress on the joint, previous knee injuries, excess weight, and genetics.
- Strengthening the muscles around the knee through regular low-impact exercise and physiotherapy can help support the joint and improve movement.
If your knees ache more than they used to, or feel stiff getting up in the morning, you're not imagining it – this is one of the most common reasons people over 40 seek out a doctor for joint pain.
What is knee osteoarthritis?
Knee osteoarthritis (knee OA) is the gradual breakdown of cartilage.
Cartilage is the smooth, slippery tissue that acts like a cushion between your bones, allowing them to glide past each other without friction. When this cushion wears down, the bones begin to rub against each other — and that is what causes the pain, stiffness, and swelling that people with knee OA experience.
People often call it "wear and tear," but that phrase understates what is happening. The joint lining thickens. Bone spurs can form. The surrounding muscles and ligaments adjust to compensate.
Knee OA is a slow structural change, not a single event.Although it is more common in older adults, knee osteoarthritis can also affect younger people who have had knee injuries, obesity, or repetitive stress on their joints.
Causes of knee osteoarthritis
Several factors can increase the risk of knee osteoarthritis, including ageing, excess body weight, repetitive stress from work or sports, and previous knee injuries that damage the joint.
There is rarely one single cause. Most patients have a combination of factors that add up over years.
- Age: Cartilage naturally loses elasticity over time. This is why symptoms usually appear from the late 40s onwards.
- Weight: Extra body weight increases the load on your knees with every step. This accelerates cartilage wear, particularly on the inner part of the joint.
- Previous injury: A past ligament tear, meniscus injury or fracture changes how weight moves through the knee. This can trigger osteoarthritis years later, even after the original injury heals.
- Joint alignment: Bow-legged or knock-kneed alignment places uneven pressure on parts of the knee. Some areas wear faster than others as a result.
- Repetitive strain: Jobs or sports involving frequent kneeling, squatting or heavy lifting add cumulative stress to the joint.
- Genetics and ethnicity: Family history plays a real role — if a close relative has knee OA, your own risk is higher. In Singapore, research has found symptomatic knee OA is more common among Indian and Malay adults than Chinese adults, which may be partly linked to differences in body weight and other factors .
- Chronic inflammation: Ongoing low-level inflammation in the body can contribute to cartilage damage over time.
Symptoms of knee osteoarthritis
Knee osteoarthritis usually develops gradually, and your symptoms may become more noticeable over time. You may experience:
- Knee pain: Pain during or after activities such as walking, climbing stairs, or standing for long periods. It may improve with rest at first but can become persistent.
- Stiffness: Especially when you wake up or after sitting for a while, usually improving with movement.
- Swelling: Your knee may become swollen, tender, or feel tight.
- Reduced movement: You may find it harder to bend or straighten your knee.
- Grinding or clicking: You may hear or feel a grinding, clicking, or crackling sensation when moving your knee.
- Muscle weakness: Weak muscles around your knee can make it feel less stable.
- Changes in knee shape: In advanced cases, your knee may become bow-legged or knock-kneed.
If your symptoms persist, worsen, or interfere with your daily activities, see a doctor. Early treatment can help relieve symptoms, improve mobility, and slow the progression of knee osteoarthritis.
Speak with our Care Team today to be matched with an orthopaedic specialist who can assess your knee, explain your options, and help you plan the next steps in your treatment.
Diagnosis of knee osteoarthritis
To diagnose knee osteoarthritis, your doctor will ask about your symptoms, review your medical history, and examine your knee. They may also recommend tests to confirm the diagnosis and rule out other conditions that can cause similar symptoms.
- Physical examination: Your doctor will check your knee for pain, tenderness, swelling, stiffness, range of motion, joint stability, and alignment. They may also observe how you walk to assess how the condition affects your movement.
- X-rays: An X-ray is usually the first imaging test used to diagnose knee osteoarthritis. It can show narrowing of the joint space, bone spurs (osteophytes), and changes in the bone that suggest cartilage has worn away.
- Magnetic resonance imaging (MRI): An MRI is not routinely needed but may be recommended if your doctor suspects damage to the cartilage, ligaments, tendons, or meniscus, or if the diagnosis is unclear. It provides detailed images of the knee's soft tissues and bones.
- Blood tests: Although there is no blood test that can diagnose knee osteoarthritis, blood tests may be performed to rule out other conditions such as rheumatoid arthritis, gout, or other inflammatory joint diseases.
- Joint fluid analysis: If your knee is swollen, your doctor may remove a small sample of joint fluid using a needle. The fluid is analysed to check for infection, gout, or inflammatory arthritis, helping confirm that osteoarthritis is the cause of your symptoms rather than another condition.
Early diagnosis can help you start treatment sooner, which may relieve symptoms, improve mobility, and slow the progression of knee osteoarthritis.
How to prevent Knee osteoarthritis
You can't fully prevent osteoarthritis knee (OA Knee), especially if age or genetics are working against you, but there's a lot within your control that can lower your risk or slow its progression:
- Maintain a healthy weight to reduce the daily load on your knee joints.
- Stay consistently active with low-impact movement rather than sporadic bursts of intense exercise.
- Strengthen the muscles around your knee, particularly your quadriceps and hamstrings, to give the joint better support.
- Warm up before exercise and use proper form, especially for activities that involve repetitive knee movement.
- Address injuries early as a knee injury that isn't properly rehabilitated raises your long-term osteoarthritis risk.
- Wear supportive, well-fitted footwear, particularly if you're on your feet often.
Knee osteoarthritis commonly causes pain, stiffness, and reduced mobility, which may make everyday activities such as walking, climbing stairs, or standing up from a chair more difficult.
How to treat knee osteoarthritis?
Treatment for knee osteoarthritis aims to reduce pain, improve mobility, and help you stay active. The right treatment depends on the severity of your symptoms, your lifestyle, and how much the condition affects your daily activities.
Most people benefit from a combination of non-surgical treatments, while surgery may be considered if symptoms become severe.
Non-surgical treatments
Lifestyle changes & Physical therapy
Simple lifestyle changes can make a significant difference in managing symptoms.
- Maintain a healthy weight: If you are overweight, losing excess weight reduces the pressure on your knees and may help ease pain and slow disease progression.
- Stay physically active: Regular low-impact activities such as walking, swimming, or cycling help strengthen the muscles around your knee, improve flexibility, and support joint function.
- Modify daily activities: Limiting activities that place excessive stress on your knees, such as prolonged standing or high-impact sports, can help reduce discomfort while keeping you active.
Physiotherapy
Physiotherapy is an important part of knee osteoarthritis treatment. A physiotherapist can create an exercise programme tailored to your needs to improve strength, flexibility, balance, and joint stability.
Your rehabilitation programme may include:
- Stretching exercises for the quadriceps, hamstrings, and calf muscles
- Strengthening exercises targeting the thigh, hip, and buttock muscles
- Functional exercises such as squats, lunges, bridges, chair stands, and balance training to improve everyday movement
- Heat or cold therapy to help relieve pain and swelling when appropriate
Medications and assistive devices
- Pain relief medications: Your doctor may recommend pain relievers or non-steroidal anti-inflammatory medications (NSAIDs) to help reduce pain and inflammation. These medicines should be taken only as advised by your healthcare provider.
- Topical pain relief: Medicated creams or gels containing anti-inflammatory ingredients can be applied directly to the knee to help ease pain.
- Supportive devices: Knee braces, shoe inserts, or walking aids such as a cane may improve stability, reduce strain on the joint, and make walking more comfortable.
- Joint injections: If pain persists despite other treatments, your doctor may recommend injections into the knee. Corticosteroid injections can provide temporary relief by reducing inflammation, while hyaluronic acid injections may improve joint lubrication in selected patients.
- Dietary supplements: Some people choose supplements such as glucosamine or chondroitin. Although they may help relieve symptoms in some individuals, there is limited evidence that they slow the progression of knee osteoarthritis. Speak to your doctor before taking any supplements.
Surgical treatments
Surgery may be recommended if non-surgical treatments no longer relieve your symptoms and knee pain significantly affects your quality of life.
- Arthroscopy: This minimally invasive procedure is not routinely performed for osteoarthritis alone but may be considered if there are additional knee problems, such as a torn meniscus or loose cartilage causing the knee to lock.
- Osteotomy: This procedure reshapes the bones around the knee to shift weight away from the damaged part of the joint. It is usually considered for younger, active individuals with arthritis affecting only one side of the knee.
- Partial knee replacement: If osteoarthritis affects only one part of the knee, replacing the damaged section while preserving the healthy parts of the joint may be an option.
- Total knee replacement: For advanced knee osteoarthritis, total knee replacement involves replacing the damaged joint surfaces with artificial components. This procedure can provide long-term pain relief and improve mobility when other treatments are no longer effective.
After surgery, rehabilitation and physiotherapy play an important role in restoring strength, improving movement, and supporting recovery. Following your surgeon's advice can help you achieve the best possible outcome.
How HiA helps
In Health in Asia, we make this easier by matching you to an orthopaedic specialist who is suitable for your condition and preferences. We also help you understand what your insurance is likely to cover and assist with booking the appointment, so you are not left sorting out the details on your own.
Whether you are just starting to look into your knee pain, deciding between treatment options, or ready to see a specialist, our team can guide you to the next right step and help you get the care you need with more clarity and less stress.
Speak with our Care Team today to be matched with an orthopaedic specialist who understands your condition and can guide you through the next steps in your treatment.
Frequently asked questions
There's currently no cure for knee osteoarthritis. Treatment focuses on managing symptoms, slowing progression, and helping you stay as active and independent as possible.
Knee osteoarthritis happens when the cartilage in your joint gradually wears down, usually affecting one or a few joints. Rheumatoid arthritis is an autoimmune disease, where the immune system attacks the joints, typically causing inflammation in multiple joints on both sides of the body at the same time.
Low-impact activities – such as walking, cycling, swimming, and strength training – are generally well suited for knee osteoarthritis. They help build supporting muscle and improve joint function without placing too much stress on the knee.
Yes. Reducing excess weight lowers the load on your knee joints with every step, which can ease pain and help slow the progression of osteoarthritis, even with modest weight loss.
Knee osteoarthritis usually progresses slowly. Early on, you may have mild, activity-related pain with normal X-rays. As it advances, pain becomes more frequent, stiffness and loss of movement increase, X-rays show narrowing of the joint space and bone spurs, and in severe stages, pain may persist even at rest and daily activities become difficult.
Yes, the Care Team will remain your point of contact for follow-up appointments, questions about medication, transitions between specialists, and anything new that comes up.
No. None of the specialists we recommend paid to be there. We match on clinical fit.
Disclaimer
This article and its contents are provided for educational and informational purposes only and do not constitute medical advice or professional services specific to you or your medical condition. For decisions about your health or treatment, speak with a qualified doctor who knows your situation. An…
How we reviewed this article:
Health in Asia has strict sourcing guidelines and relies on peer-reviewed studies, academic research institutions, and medical journals and associations. We only use quality, credible sources to ensure content accuracy and integrity. You can learn more about how we ensure our content is accurate and current by reading our editorial policy.
