Osteoarthritis of the Knee :Why Most People Never Need Surgery
Osteoarthritis of the Knee: Why Most People Never Need Surgery
You notice it on the stairs. Not going up — going down. Then someone at a family dinner says, with total confidence: “That one is arthritis lah. Eventually must change knee.”
That sentence is wrong, and it does more damage than the arthritis.
So is a knee replacement coming for me?
Probably not.
Singapore has one of the highest rates of knee osteoarthritis in the world — third globally. And yet most people with it keep walking, travelling and staying active for years without ever needing a new knee.
The most striking evidence comes from a programme called GLA:D, which put tens of thousands of people through structured exercise and education. Among those who wanted surgery when they started, three in four had not had it — and no longer wanted it — twelve months later.
Not a cure. But three out of four people who’d already mentally booked the operation, changing their minds after exercise alone, is worth pausing on.
Do I need an X-ray?
Usually, no — and this surprises people.
Among people with knee pain, only some show arthritis on X-ray. And among people whose X-rays look bad, plenty have no pain at all. The picture and the symptoms often don’t match.
Singapore’s national guideline says it plainly: knee osteoarthritis is diagnosed by examining you, and imaging has a limited role — reserved for unusual symptoms, warning signs, or planning surgery.
There’s a quieter reason too. Show someone a picture of a narrowed joint and they rarely walk out keen to exercise. They walk out feeling fragile. That belief becomes its own problem.
What about injections?
Depends entirely on which one. Short version:
Steroids — Works, genuinely, for up to about six months. Best used to break a bad patch so you can get back into exercising. Not a standing arrangement every three months forever; there are downsides with repeated use, including possible cartilage loss.
Hyaluronic acid (“lubricating jab”) — Singapore’s national guideline found no significant benefit over placebo, and a higher chance of a swollen, sore knee afterwards.
PRP (your own blood, spun down) — Worth understanding properly, because it gets talked about as one thing when it’s really two. For soft tissue — tendons, ligaments, muscle — the evidence for PRP is good, and it’s an established part of sports injury care. Inside the joint is a newer question, and the evidence there is only now emerging: early trials were mixed, partly because there’s no standard recipe, so “PRP” means different things at different clinics. Encouragingly, MOH has begun a sandbox trial for PRP in knee osteoarthritis. This is a space worth watching.
Stem cells — The marketing is well ahead of the evidence. Expensive.
Worth asking before any injection: what is this meant to achieve, by when, and what exercise programme is it supporting? If the answer to the last one is “none” — that’s the actual gap.
And when is surgery right?
It’s a very good operation for the right person at the right time — modern knees last around 25 years. Nothing here should put off someone who needs one.
The trigger is: real symptoms despite proper conservative treatment, function and quality of life genuinely affected, going on for at least three to six months.
The catch is in “proper.” Three months of rest and painkillers isn’t conservative treatment. A structured, supervised, progressing programme is. Locally, fewer than half of people with knee osteoarthritis were even referred for weight management or assessed for walking difficulty — meaning a lot of people reach the surgical decision having never actually been offered the alternative.
Our clinical insight
One of the commonest misconceptions we encounter is that knee pain automatically means surgery is inevitable. In reality, most people with knee osteoarthritis can continue walking, travelling and remaining active for many years without requiring a knee replacement. The key lies in understanding when to intervene — and choosing the right treatment at the right time.
Timing is the whole game. Act while the muscle is still there and the habits are still movable, and the direction of travel changes. Wait five years, and you’re working uphill.
"Wear and tear" — is my knee just used up?
Probably not.
Singapore has one of the highest rates of knee osteoarthritis in the world — third globally. And yet most people with it keep walking, travelling and staying active for years without ever needing a new knee.
The most striking evidence comes from a programme called GLA:D, which put tens of thousands of people through structured exercise and education. Among those who wanted surgery when they started, three in four had not had it — and no longer wanted it — twelve months later.
Not a cure. But three out of four people who’d already mentally booked the operation, changing their minds after exercise alone, is worth pausing on.
🔎 Does this sound like your knee?
This won't diagnose you — no online tool can. What it does is sort your symptoms into a pattern and tell you what a sensible next step looks like.
General information only, not a diagnosis or individual medical advice. If your knee is hot, red, swollen and severely painful — especially with fever — seek medical attention now.
Is knee pain in older people always arthritis?
No — and this is the part worth reading twice.
Because arthritis is so common after 50, it becomes the default explanation for everything. That’s how the other causes get missed:
- Gout loves the knee, not just the big toe. The giveaway is speed — hours, not months, and the joint is hot and angry.
- A hip problem pretending to be a knee problem. Hip arthritis often shows up as thigh and knee pain while the hip itself feels fine. People get treated for the wrong joint for a year.
- A small stress fracture under the cartilage. Sudden severe knee pain, often at night, no injury, and a normal X-ray. Classic reason someone is told “nothing’s changed, it’s just your arthritis” while in real pain.
- Joint infection. Uncommon, but it can wreck a knee in days. A hot, red, swollen, severely painful knee — especially with fever — is a same-day problem, not a next-week one.
Quick filter: arthritis comes on over months and stiffens for under 30 minutes in the morning. Anything that arrives in hours, stays stiff for over an hour, or turns the knee hot and red is telling you something else.
If your knee is hot, red, swollen and severely painful — especially with a fever — do not use this tool. Seek medical attention immediately. Contact the clinic or go to your nearest emergency department.
🚩 Should this knee be seen urgently?
You'll get one of three answers: see someone today, get assessed this week, or no rush.
This tool does not diagnose anything and does not replace being examined. If you are worried, act on that — get seen.
What actually works, then?
Two things. Neither is exciting, and both are more effective than most of what gets sold.
Movement. Not rest. Exercise improves pain tolerance, calms swelling, and builds the muscle that protects the joint. Nothing is proven best — walking, strengthening, tai chi, swimming, Pilates all work. The best one is the one you’ll still be doing in six months. Aim for moderate effort, three times a week, 20–60 minutes. If that’s not realistic, some is genuinely better than none.
The rule that matters: sore during and after is fine if it settles within 24 hours. Still sore tomorrow, or swollen and staying swollen? The dose was too much. Adjust it — don’t quit.
And get the programme built properly. Supervised exercise with a physiotherapist produces better results than working it out alone — not because home exercise is useless, but because technique, load and progression are genuinely hard to self-manage, and getting them wrong is how people conclude that exercise “made it worse”. A generic exercise sheet off the internet is not the same thing as a programme built around your knee, your strength and what you’re actually trying to get back to.
Weight. Here’s the number that reframes everything:
Lose 1 kg, and you take about 4 kg off each knee — with every single step.
Lose 5 kg, that’s 20 kg less load, thousands of times a day, for the rest of your life. In trials, losing 10% of body weight cut knee pain roughly in half.
Go slowly — 5–10% over six to twelve months. And do resistance training alongside it, because losing weight while losing muscle is a bad trade in a condition where muscle is the protection. (More on that trap in Sarcopenia and Medical Weight Management.)
⏰ Get a number on it — 30 seconds, one chair
How to do it
- Sit in a firm chair — a dining chair, not a sofa — with its back against a wall.
- Fold your arms across your chest.
- Stand up fully, then sit back down. That’s one.
- Do as many as you can in 30 seconds. Count them.
Time’s up. How many did you complete?
A functional measure, not a diagnosis. Scores are affected by lots of things besides your knee — general fitness, balance, other joints, medication. Use it to track your own change over time rather than to compare yourself to anyone else.
Getting it properly looked at
A good first knee consultation examines the knee and the hip, rules out the things that mimic arthritis, measures a baseline, and sends you out with a written plan — not just a prescription.
Cresta Medical · 10 Chai Chee Road, #01-01, Singapore 467010
Make your health a priority
Schedule an in-clinic appointment, or speak with Dr Alexis Wong and our care team online — whichever works best for you.