Quick answer. Knee osteoarthritis is the gradual wear of the joint cartilage and is the most common cause of chronic knee pain and disability in older adults, causing pain on activity and weight-bearing, stiffness after rest, swelling and a creaking sensation. It is managed first without surgery – weight loss, exercise and physiotherapy to strengthen the quadriceps, activity modification, walking aids, simple pain relief and sometimes joint injections. For severe disease that fails conservative care, total or partial knee replacement is very effective and is MediSave-claimable. Osteoarthritis is managed rather than cured, and staying active is an important part of keeping the knee working.
Living with joint, back or bone pain that won’t settle?
Message our care team on WhatsApp. Tell us what’s going on and we’ll help you find the right best orthopaedic clinic — free, with no obligation.
Chat with our care team on WhatsAppNot sure who to see? Find the right specialist →
In a medical emergency, or for severe or sudden symptoms such as breathing difficulty, chest pain, fainting or stroke signs, call 995 immediately.
Knee osteoarthritis (OA) is the commonest form of arthritis and a leading cause of knee pain and reduced mobility in older Singaporeans. It develops as the smooth cartilage cushioning the knee gradually wears away, so the joint becomes painful, stiff and swollen over time. The good news is that most people are managed well without surgery, and even severe cases have an effective, well-established treatment in knee replacement. This guide explains the symptoms, who is at risk, how it is diagnosed and the step-by-step treatment ladder used in Singapore.
At a glance
| Approach | What it involves | Notes |
|---|---|---|
| Weight management | Losing excess weight to reduce load through the knee | Key modifiable factor; even modest loss helps pain |
| Exercise & physiotherapy | Quadriceps and hip strengthening; low-impact activity (walking, cycling, swimming) | First-line; rest/inactivity is discouraged as it weakens the knee |
| Activity aids & modification | Walking stick, frame or cane; adjusting high-impact tasks | Reduces load and improves stability and confidence |
| Pain relief | Paracetamol; topical or oral NSAIDs as advised | Symptom control; use as directed by doctor/pharmacist |
| Joint injections | Corticosteroid (short-term relief); hyaluronic acid (mixed evidence) | Considered case by case when other measures are not enough |
| Knee replacement surgery | Total or partial (unicompartmental) knee replacement | For severe disease failing conservative care; MediSave-claimable, very effective |
What knee osteoarthritis is
In a healthy knee, a thin layer of smooth cartilage covers the ends of the bones, letting them glide over each other with very little friction. In osteoarthritis this cartilage gradually wears down. In severe cases the bones can rub almost directly against each other with little lubrication, leading to pain and disability. OA is the most common form of arthritis and a major cause of chronic knee pain in older adults.
It is often described as “wear and tear”, but it is not simply an inevitable part of ageing – several risk factors speed it up, and some of them can be changed.
Symptoms to look out for
Knee osteoarthritis usually comes on gradually over months to years. Common symptoms include:
- Knee pain that is worse with activity and weight-bearing (walking, climbing stairs, standing for long periods)
- Stiffness, especially in the morning or after a period of rest or inactivity
- Swelling around the joint
- Reduced range of movement – the knee may feel tight or hard to fully bend or straighten
- Creaking or grating (crepitus) felt or heard when moving the knee
Some people also notice bony bumps or a change in the shape of the knee as the condition progresses.
Who is at risk
Several factors increase the likelihood of developing knee osteoarthritis:
- Age – risk rises in older adults
- Being overweight – extra body weight greatly increases load through the knee, and this is a key modifiable risk factor
- Previous knee injury – such as a past ligament tear or fracture
- Repetitive stress from high-impact, heavily weight-bearing activities or occupations, and weak or tight lower-limb muscles
- Female sex – women are more commonly affected, particularly after menopause
- Genetics – a family history of osteoarthritis
Because weight is one of the few risk factors you can directly influence, it is central to treatment.
How it is diagnosed
Diagnosis is mainly clinical. A doctor will ask about your symptoms and examine the knee, then usually confirm the diagnosis with X-rays, which can show narrowing of the joint space, bony spurs and other typical changes. Blood tests or joint fluid tests are sometimes done to exclude other causes such as rheumatoid arthritis or gout. Advanced scans like MRI are not routinely needed for straightforward osteoarthritis.
Non-surgical treatment comes first
For most people, osteoarthritis is managed without surgery. The aim is to reduce pain, keep the joint moving and slow further strain on it. Non-surgical measures include:
- Weight loss if you are overweight – even modest weight loss significantly reduces the load through the knee and can ease pain.
- Exercise and physiotherapy – strengthening the quadriceps and surrounding muscles supports and stabilises the knee. Prolonged rest is not advised, as inactivity wastes these muscles and worsens pain and instability. Low-impact activities such as walking, cycling and swimming are encouraged.
- Activity modification – adjusting how you do high-impact tasks to protect the joint.
- Walking aids – a cane, hiking stick or walking frame can reduce load and improve confidence.
- Simple pain relief – paracetamol, and topical or oral NSAIDs (anti-inflammatories) as advised by your doctor or pharmacist.
- Injections – corticosteroid injections can give short-term relief of a flare-up; hyaluronic acid (visco-supplementation) injections are sometimes used, though the evidence for benefit is mixed. These are decided case by case.
Supplements such as glucosamine and chondroitin are commonly taken; they may help some people’s pain but have not been shown to halt the progression of osteoarthritis.
Surgery for severe disease
When symptoms remain severe and conservative treatment has not given enough relief, and the joint degeneration is advanced, knee replacement surgery may be advised. The worn surfaces are replaced with artificial components – either a total knee replacement or, when only part of the knee is affected, a partial (unicompartmental) knee replacement. It is a very effective, well-established operation that relieves pain and restores function for most patients.
Knee replacement is MediSave-claimable and is covered under MediShield Life. In public (restructured) hospitals, subsidised inpatient total knee replacement has a typical (median) bill of roughly S$7,000-S$7,400 in B2/C class wards, while unsubsidised and private bills are substantially higher (around S$23,000-S$43,000), based on MOH-published transacted bill data. These figures are before MediSave and insurance payouts; your actual out-of-pocket cost depends on your ward class, hospital and insurance, so it is best to check with the hospital and your insurer.
Related guides
- Best Orthopaedic Clinics in Singapore — our editorial shortlist
- orthopaedic clinics directory
- Frozen shoulder
- Gout treatment
- Osteoporosis & bone health
Sources
- HealthHub (Singapore) – Knee Osteoarthritis: Causes and Treatment Options
- SingHealth – Knee Osteoarthritis: Conditions & Treatments
- Ministry of Health Singapore – Primary Total Knee Replacement (Unilateral) bill information (SB810K)
- NUHS – Osteoarthritis: Symptoms, Diagnosis, Treatment
See also
Related conditions & guides
Related conditions and guides you may find useful:
Part of our Bones, joints, spine & sports guides · Browse all health topics