Treating Knee Arthritis Without Surgery
What actually works for knee arthritis before surgery, and what does not — exercise, weight, cortisone, gel injections, supplements and PRP, measured against the Australian clinical guideline. Written by a Perth knee surgeon who does not sell injections.
Most people with knee arthritis do not need surgery, and most who eventually have it did not need it when they first started worrying about it.
This section covers what is actually available before a knee replacement, and — more usefully — what the evidence says about each option. It is measured against the Royal Australian College of General Practitioners’ guideline for the management of knee and hip osteoarthritis, which is the Australian reference standard.
A note on where this is coming from. Dr Clark is a knee surgeon. He does not sell injections, supplements or infusions, and has no commercial interest in any of the treatments below. That makes it straightforward to be blunt about which ones the evidence supports.
The short version
| Treatment | What the Australian guideline says |
|---|---|
| Exercise (land-based) | Strongly recommended for everyone with knee OA |
| Weight management | Strongly recommended if overweight, target 5–7.5% of body weight |
| Cortisone injection | May be appropriate for some people, for short-term relief |
| Paracetamol | No recommendation either way — reasonable to trial |
| Anti-inflammatory creams | No recommendation either way — reasonable to trial |
| PRP injections | No recommendation — evidence not good enough |
| Glucosamine, chondroitin, fish oil | Suggested not to be offered |
| Gel (hyaluronic acid) injections | Not recommended |
| Stem cell therapy | Not recommended |
| Opioids | Not recommended |
| Arthroscopy for arthritis | Not recommended |
The pattern is worth noticing. The two treatments with the strongest evidence are the two nobody profits from, and several of the most heavily marketed are the ones the guideline advises against.
Start here
Exercise and physiotherapy — the single most effective non-surgical treatment, why it works on an arthritic knee, and why it feels counterintuitive.
Weight and knee load — what a kilogram actually does at the knee, and why the target is smaller than most people assume.
Symptom relief
Cortisone injections — what they do, how long they last, and the question of repeat injections.
Tablets, creams and supplements — paracetamol, anti-inflammatories, glucosamine, fish oil, turmeric and opioids, each against the evidence.
Treatments worth being careful about
Gel injections (hyaluronic acid) — widely advertised, and specifically recommended against in Australia.
PRP and stem cell injections — what is actually known, what is being sold, and what to ask before paying for either.
What none of it can do
It is worth being straightforward about the ceiling.
No non-surgical treatment regrows cartilage or reverses established arthritis. Nothing currently available does this, including every injection marketed on the promise that it might. What good non-surgical management does is reduce pain, improve function and buy time — often a great deal of time, and often enough that surgery never becomes necessary.
That is a genuinely worthwhile goal, and it is a different claim from the one being made in most advertising.
When surgery starts making sense
There is no point at which arthritis obliges you to have a knee replacement. It is an elective operation, chosen when the pain and restriction outweigh the surgery and the recovery.
In practice, the people who do well from surgery tend to be the ones for whom pain is limiting things they actually care about, disturbing sleep, or narrowing their walking distance enough to shape their day — and who have given the non-surgical options a fair go rather than a token one.
If you are at that point, Do I Need a Knee Replacement? works through the decision in detail — including the age question and what the operation realistically delivers. Understanding Knee Arthritis explains the condition itself, and total knee replacement and partial knee replacement cover the operations themselves. If you are not, the pages above are the better use of your time.
To discuss where your knee sits, book a consultation or phone the rooms on (08) 6332 6365. Dr Clark consults at Murdoch and Mandurah.
What is the best non-surgical treatment for knee arthritis?+
Exercise. It is the only treatment the Australian guideline strongly recommends for every person with knee osteoarthritis, and land-based exercise — walking, muscle strengthening, Tai Chi — has better evidence behind it than any injection, tablet or supplement. Weight management is the second strongly recommended treatment for anyone carrying extra weight, with a target of 5 to 7.5% of body weight. Everything else is either a short-term adjunct or unsupported.
Can I avoid a knee replacement?+
Often, and for a long time. Knee replacement is an elective operation chosen when pain and loss of function outweigh the surgery — not something arthritis inevitably leads to. Many people manage well for years with exercise, weight management and periodic symptom relief. What non-surgical treatment cannot do is reverse established arthritis or regrow cartilage, and no currently available injection does either, whatever the advertising suggests.
Do cortisone injections work for knee arthritis?+
For short-term relief, often yes. The Australian guideline says a corticosteroid injection may be appropriate for some people with knee osteoarthritis. The honest limitation is duration — the average benefit over placebo in trials lasts around two to four weeks, occasionally longer. They are useful for settling a flare or getting through a specific event, and poorly suited to being a long-term strategy.
Do gel injections or stem cell treatments work for knee arthritis?+
The Australian guideline recommends against both. Viscosupplementation — the hyaluronic acid gel injections often marketed for knee arthritis — is in the guideline's do-not-offer list, as is stem cell therapy. For platelet-rich plasma the guideline makes no recommendation either way, because the quality of evidence is not sufficient to support one. These are all commonly advertised and often expensive, which is precisely why it is worth knowing what the evidence says.
Are glucosamine and fish oil worth taking for knee arthritis?+
The Australian guideline suggests not offering glucosamine, chondroitin, the combination of the two, or omega-3 fatty acids for knee osteoarthritis. They are not dangerous, and people who feel they help are not imagining it, but the evidence does not support recommending them. Money spent on them is generally better spent on supervised exercise.
When should I stop trying non-surgical treatment and consider surgery?+
There is no threshold you cross. The usual point is when pain limits the things that matter to you despite genuinely trying exercise and weight management, when it disturbs your sleep, or when your walking distance has narrowed to the point that it is shaping your life. Waiting does not damage the knee in a way that makes later surgery worse, so there is no need to rush — but there is also no prize for enduring it longer than you want to.
Exercise & Physiotherapy
Exercise is the only treatment strongly recommended for everyone with knee osteoarthritis in the Australian guideline. What kind, how much, why it does not wear the joint out, and what to do when it hurts at first.
Learn more →Weight & Knee Load
How much difference weight actually makes to an arthritic knee, why the Australian guideline's target is 5 to 7.5% of body weight rather than a goal weight, and what to do if losing it has not worked before.
Learn more →Cortisone Injections
What a cortisone injection does for an arthritic knee, how long the benefit actually lasts, the evidence on repeated injections and cartilage, and the timing rule that matters if you may have a knee replacement later.
Learn more →Gel Injections (Hyaluronic Acid)
Hyaluronic acid gel injections — Synvisc, Durolane, Monovisc and similar — are widely advertised for knee arthritis and specifically recommended against in the Australian guideline. What the evidence shows, and what to ask before paying.
Learn more →PRP & Stem Cell Injections
Platelet-rich plasma and stem cell injections for knee arthritis — what the Australian guideline says about each, what they cost, why the claim of cartilage regrowth is not supported, and the questions to ask before paying.
Learn more →Tablets, Creams & Supplements
Paracetamol, anti-inflammatories, anti-inflammatory creams, glucosamine, chondroitin, fish oil, turmeric and opioids for knee arthritis — each measured against the Australian clinical guideline.
Learn more →