Most people with knee osteoarthritis don’t need surgery yet, and a meaningful number won’t need it at all. The strongest evidence in the field — across decades of trials, across countries, across patient populations — supports loading, strengthening and weight management as first-line care for knee OA. Not arthroscopy. Not platelet injections. Not stem cells. Strength.
That isn’t a fringe position; it’s the position of essentially every clinical guideline for managing knee OA in the developed world. And it’s usually a surprise to patients who come in expecting to be told that surgery is the inevitable destination.
The phrase "wear and tear" has done a lot of damage
For decades, knee OA was framed to patients as a wear-and-tear problem — the knee was wearing out, and the only question was when to replace it. That framing made sense in a much older view of cartilage as a passive material. We now know cartilage is biologically active. It responds to load. Reasonable loading actually keeps it healthier than rest does.
The other thing wrong with the wear-and-tear story is that it implies pain tracks the structural damage. It often doesn’t. Some people have X-rays that look terrible and almost no pain. Others have mild changes on imaging and severe symptoms. The structural picture and the experience of pain are loosely coupled at best.
What physiotherapy actually does for knee OA
Three things, broadly:
Progressive strength loading
The most-studied intervention for knee OA is progressive resistance training of the quadriceps and the hip muscles. A typical program runs eight to twelve weeks, with two or three sessions per week, building load over time. Outcomes are large and consistent: pain down, function up, quality of life up.
The dose is what people get wrong. Light theraband work in a clinic once a week doesn’t change the knee. Properly progressed loading, with meaningful effort, twice a week, does.
Education about load and pain
A lot of OA pain is shaped by patterns of activity that the patient hasn’t noticed. Long walks one day and nothing for three. Avoiding stairs entirely. Never lifting anything heavier than the kettle.
Helping the patient understand how the knee responds to load — and how to spread load across a week rather than concentrating it — often produces noticeable change inside a fortnight, before the strength work has had time to do its job.
Weight management when relevant
For patients with excess body weight, even modest weight loss reduces knee load and pain meaningfully. Every kilogram lost reduces the load on the knee with every step. We don’t prescribe diets — that’s outside our scope — but we connect the dots, refer where appropriate, and adjust the exercise program to support the goal.
The GLA:D® program
GLA:D® (Good Life with Arthritis: Denmark) is a structured education-plus-exercise program developed specifically for hip and knee OA. It has been delivered to hundreds of thousands of participants worldwide and has substantial published evidence behind it.
A standard GLA:D® program runs:
- Two assessment sessions covering OA education and functional testing
- Six weeks of supervised exercise sessions (twice weekly), in clinic or remote
- A follow-up at three months and twelve months to monitor outcomes
Outcomes data across thousands of Australian participants shows reductions in pain, reductions in painkiller use, and improvements in function that hold up at twelve months. Some participants who came in heading for surgery have come out not needing it.
When surgery is genuinely the right answer
Knee replacements are excellent operations. They’re also major surgery with months of rehab, and the right time to have one is when other interventions have been properly tried. Australian Orthopaedic Association guidance generally suggests considering surgery when:
- pain is severe and consistently affects daily activities and sleep
- a structured strength program of at least three months hasn’t given sufficient relief
- imaging confirms advanced OA matching the clinical picture
- the patient is otherwise fit enough for the operation and post-operative rehab
If those criteria are met, surgery is a good choice. If they’re not, surgery is premature. We help patients have the right conversation with the right surgeon at the right time — neither delaying when surgery is warranted, nor rushing into it.
Common myths we hear in the clinic
"I’ll wear it out faster if I exercise"
No. The opposite. Reasonable, progressive loading keeps the knee healthier than avoidance does. The studies on this are remarkably consistent.
"I had a cortisone shot, it didn’t work"
Cortisone is hit-and-miss for OA, with most benefit lasting weeks to a few months. It can be useful as a bridge to start exercise through a painful flare, but it isn’t a long-term strategy. Repeated cortisone over years has cumulative downsides for cartilage.
"I need to lose weight first before I can exercise"
You can do both at once, and exercising while losing weight is more effective than either alone. We adjust the exercise selection to suit current capacity. Start where you are.
What a program looks like in practice
A first appointment for knee OA at our clinics or via the mobile team looks like:
- A 45–60-minute initial: history, functional testing (chair stand, walking, balance), conversation about goals
- A clear explanation of what knee OA is and what changes with treatment
- A starting exercise program, with progressions written out for the first 4–6 weeks
- A review at week 3 to adjust loads
- A formal re-assessment at week 8 or 12 to measure change
Most patients see meaningful change in pain and function inside the first two months. Patients who stick with the program for a full six months — and most of them do — typically end up substantially better than they expected. The full condition page covers more detail on the evidence base.
What the day-to-day looks like — being on the program
A common worry is that "structured exercise program" sounds like a level of commitment most people can’t sustain. In practice the program asks for two strength sessions a week of 30 to 40 minutes each, plus continuing with walking and the activities you already do. That’s it. No gym membership required; we can run the entire program in a lounge room with two kettlebells and a sturdy chair.
The hard part isn’t the exercise itself. It’s sticking with it through the first three or four weeks when the knee is still sore and progress feels slow. Once the strength starts to come back, the work feels easier and the knee feels better, and the program looks after itself. Almost every patient who completes the first eight weeks chooses to keep going indefinitely, because the cost-benefit becomes obvious.
Frequently asked questions
How long until I notice change?
Most people notice something — better stair confidence, less morning stiffness, easier sit-to-stand — within four to six weeks. By twelve weeks the change is often substantial.
Will the program work if I’m in my eighties?
Yes. Strength gains are achievable into the ninth decade and beyond, with progressively lower starting loads. Functional outcomes — getting out of a chair, walking further, sleeping better — are often as good in older patients as younger ones.
What if I’m already booked for surgery?
Prehab is the right answer. Stronger quads going into a knee replacement means a faster recovery coming out, lower risk of complications, and better function at twelve months. Even six weeks of pre-op physio is worthwhile.
The bottom line
For most people in Sydney with knee OA, the evidence-based path is clear. Don’t panic about the X-ray. Don’t skip straight to surgery without trying the alternative. Don’t rest the knee in the hope it’ll heal. Load it properly, strengthen it patiently, manage your weight if that’s a factor, and let the knee do what knees do — adapt.
If you’ve been told you have knee OA and aren’t sure what to do next, book an initial assessment at our Sydney CBD, Caddens or Castle Hill clinic — or have the mobile team visit you.