Knee arthritis is common, but it is not a one-way slide. What actually helps knee pain, why exercise comes first, and when surgery is worth considering.
"Your knee is bone on bone." For a lot of people, that sentence — after an X-ray, often at a GP visit or a specialist appointment — is where the worry starts. It sounds final, as if the only options are to put up with the pain or wait for a knee replacement.
The research paints a far more hopeful picture. Knee osteoarthritis is extremely common, the amount of pain you feel often does not match what the X-ray shows, and the treatment with the strongest evidence — exercise — is something you can start now. This guide explains what osteoarthritis is, what actually helps, what does not, and how physiotherapy fits in.
At a glance
- What it is: a whole-joint condition involving cartilage, bone, the joint lining and the muscles around the knee
- How common: one of the leading causes of pain and disability worldwide, especially after 50
- First-line treatment: education, exercise and, where relevant, weight management — recommended for everyone with knee osteoarthritis
- Exercise works: a Cochrane review found it reduces pain and improves function, with effects similar to common pain medicines
- Not recommended: keyhole "clean-out" surgery for arthritis; strong opioids
- Knee replacement: effective for severe cases, but many people improve enough with a good exercise programme to delay or avoid it
What is knee osteoarthritis?
Osteoarthritis used to be described as "wear and tear" — cartilage slowly grinding away until bone rubs on bone. We now know it is more than that. A major review in The Lancet describes osteoarthritis as a condition of the whole joint: the cartilage, the bone underneath it, the joint lining, the ligaments and the muscles all change. The joint is constantly repairing itself, and in osteoarthritis that repair struggles to keep up.
That shift matters, because "wear and tear" suggests that using the knee wears it out further. In reality, appropriate movement and loading are what keep a joint healthy. Cartilage has no blood supply of its own and relies on movement to get its nutrients.
Who gets it?
- People over 50, with risk rising with age
- Women more than men
- People carrying extra body weight
- People with a previous knee injury — especially a torn ACL or meniscus, or a fracture into the joint
- Those with a family history, or whose work involves a lot of kneeling, squatting and heavy lifting
Symptoms
- Pain with activity — stairs, getting up from a chair, walking further than usual
- Stiffness first thing in the morning or after sitting, usually easing within about half an hour
- Swelling, especially after a busy day
- Creaking or grinding (crepitus) — common, and usually not harmful on its own
- A feeling of weakness or the knee "giving way"
- Pain that fluctuates: good weeks and bad weeks
Why your X-ray does not tell the whole story
Here is something many people find reassuring. A systematic review in the British Journal of Sports Medicine pooled MRI scans of adults with no knee pain and no history of knee injury. Changes associated with osteoarthritis, such as cartilage defects, were common — seen in roughly a quarter of adults under 40 and in a larger share of those over 40.
In other words, many knees that "look bad" on a scan feel fine, and some knees that hurt a lot look fairly normal. Pain is influenced by muscle strength, activity levels, sleep, stress, weight and general health, not only by the state of the cartilage. That is exactly why treatments that change those things can reduce pain, even though they do not change the X-ray.
“We treat the person and how their knee works, not the X-ray. Plenty of people with 'bone on bone' reports are walking, gardening and travelling comfortably after a good strengthening programme.”
— UpPlus Physiotherapy team
What helps: the evidence
International guidelines from the Osteoarthritis Research Society International (OARSI) recommend the same core treatments for everyone with knee osteoarthritis: education about the condition, structured exercise, and weight management where relevant.
1. Exercise — the cornerstone
A Cochrane review, summarised in the British Journal of Sports Medicine, found that land-based exercise reduces knee pain and improves physical function, with benefits comparable in size to those of common pain medicines, and that the benefit continued for months after a supervised programme ended.
The best exercise programmes usually combine:
- Strengthening — especially the thigh (quadriceps) and hip muscles, which act as shock absorbers for the knee
- Neuromuscular and balance exercise — controlling the knee's alignment during movements like stepping and squatting
- Aerobic activity — walking, cycling, swimming or water exercise
Structured programmes such as GLA:D, which started in Denmark and is now delivered by trained physiotherapists in many countries including Australia, combine two education sessions with twelve supervised exercise sessions and have reported meaningful reductions in pain across large numbers of patients.
2. Weight management
Every step loads the knee with several times your body weight, so even modest weight loss reduces the load substantially. In the IDEA trial, published in JAMA, overweight and obese adults with knee osteoarthritis who combined diet and exercise lost around 10% of their body weight and had less pain and better function than those who exercised alone.
3. Pain relief that helps you stay active
- Topical anti-inflammatory gels on the knee are recommended by OARSI as a lower-risk option.
- Oral anti-inflammatories can help in flare-ups for some people, but carry stomach, kidney and heart risks — discuss them with your GP or pharmacist.
- Strong opioids are not recommended for osteoarthritis.
- Corticosteroid injections may give short-term relief during a significant flare-up.
4. Supports and aids
A walking stick in the opposite hand, supportive footwear and, for some people, a knee brace can reduce pain and help you keep moving. A physio can advise on what suits you.
5. Hydrotherapy
Exercising in warm water takes some load off the joint and can be a comfortable way to start, especially if land-based exercise is painful. It works best as a stepping stone towards land-based strengthening. See our hydrotherapy programme.
What does not help
Keyhole "clean-out" surgery
Arthroscopic surgery to wash out or smooth a knee with osteoarthritis was once common. Two landmark trials in the New England Journal of Medicine changed that. One compared arthroscopic surgery with a placebo operation (small skin incisions only) and found no difference in pain or function. The other found that adding arthroscopic surgery to physiotherapy and medication gave no additional benefit. It is no longer recommended for osteoarthritis.
Rest
Avoiding activity weakens the muscles that protect the knee, increases stiffness and usually makes pain worse over time. Short rest during a flare-up is fine; long-term rest is not.
What about knee replacement?
Total knee replacement is an effective operation for people with severe osteoarthritis whose pain and function have not improved enough with non-surgical care. A Danish trial in the New England Journal of Medicine compared knee replacement followed by a non-surgical programme with the non-surgical programme alone. The surgical group improved more over 12 months, but had more complications — and about three-quarters of the non-surgical group did not go on to have a knee replacement within the year.
The message is not "avoid surgery". It is that a proper exercise-based programme should come first, and for many people it is enough. If you do need a replacement, being stronger beforehand helps your recovery afterwards. Read about our knee replacement rehab.
Exercises to start with
Work within a level of discomfort that settles within 24 hours. Mild pain during exercise is acceptable and is not a sign of damage.
- Sit to stand: stand up from a chair and sit down slowly, without using your hands if you can. 3 sets of 8–10.
- Straight leg raise: lying down, tighten the thigh and lift the straight leg to the height of the other bent knee. 3 sets of 10.
- Step-ups: step up onto a low step, leading with the sore leg, and control the knee over your foot. 3 sets of 8–10.
- Side-lying leg lift: for the hip muscles that help control the knee. 3 sets of 10.
- Walking or cycling: build gradually towards 30 minutes most days.
A physio will progress these with weights, resistance bands and balance work as you get stronger.
Living with knee arthritis day to day
Small changes in how you go about your day can take a lot of strain off a sore knee, without giving up the things you enjoy.
Stairs
Going up, lead with your stronger leg; coming down, lead with the sorer one ("up with the good, down with the bad"). Use the handrail. As your strength improves, you will often find you no longer need to think about it.
Getting up from a chair
Choose chairs with arms and a firm, higher seat. Shuffle forward first, put your feet back under you, lean forward "nose over toes" and push up. This is exactly the movement your sit-to-stand exercise trains.
Walking and pacing
Rather than one long walk that leaves you sore for two days, try two or three shorter walks spread through the day, and build up gradually. Good, cushioned shoes make a noticeable difference on hard surfaces.
Having a flare-up plan
Most people with knee osteoarthritis have flare-ups — a few days or weeks where the knee is more painful and swollen, often after doing more than usual. A flare-up does not mean the joint has been damaged. Have a plan ready:
- Reduce, but do not stop, your exercise — fewer repetitions, less weight, shorter walks
- Use heat or ice, whichever you find more comfortable, and a topical gel if your GP or pharmacist agrees
- Keep moving gently through the day so the joint does not stiffen
- Build back up over a week or two once it settles
- Contact your physio if it has not settled within two weeks
Sleep
Poor sleep makes pain feel worse, and pain makes sleep worse. A pillow between the knees when lying on your side, or under the knees when lying on your back, helps many people get comfortable.
Myths about knee arthritis
- "Bone on bone means nothing can help." Exercise reduces pain even in knees with significant X-ray changes.
- "Exercise will wear the joint out faster." Appropriate exercise is one of the most effective treatments.
- "A clean-out operation will fix it." Trials show it is no better than placebo surgery or physiotherapy.
- "It only gets worse." Many people's symptoms stay stable or improve with the right management.
When to see a physio
- Knee pain is limiting walking, stairs, work, sport or sleep
- You have been told you have osteoarthritis and want a plan
- You are on a waiting list for a knee replacement and want to be stronger beforehand
- Flare-ups keep interrupting your exercise routine
See your GP promptly if your knee is hot, red and very swollen, if you feel unwell or feverish, or if you cannot bear weight after an injury.
What we offer at UpPlus Physiotherapy
- A thorough assessment of your knee, hip, strength, walking and goals
- An individual strengthening programme, progressed over time — in the clinic, in our gym-based rehab or at home
- Hydrotherapy for people who find land-based exercise hard to start
- Advice on pain management, activity pacing, supports and when to consider a surgical opinion
- Pre- and post-operative rehab if you do go ahead with a knee replacement
If you have a GP chronic condition management plan, physiotherapy sessions under the plan can be bulk billed. We also see DVA clients. Read more about knee osteoarthritis and osteoarthritis in general.
Finding a physio near me for knee arthritis
When people search for the best physio for knee arthritis, the things that matter are a programme built around strengthening rather than passive treatments alone, regular progression, clear advice about surgery, and a clinic close enough to keep coming back to.
Our clinic is at 177 Trimmer Parade, Seaton, a short drive from Woodville, Findon, Fulham Gardens, Grange and West Lakes. No referral is needed, and you can claim on the spot with private health cover.
Physio take-home message
- Knee osteoarthritis is common and manageable — the X-ray does not decide how much it hurts.
- Exercise is the first-line treatment, with benefits similar to pain medicine and lasting for months.
- Strengthen the thigh and hip muscles, and stay active with walking, cycling or water exercise.
- Weight loss, if needed, reduces knee load and pain.
- Avoid "clean-out" keyhole surgery; consider a knee replacement only after a proper exercise programme.
If knee pain is holding you back, our physiotherapists can build a strengthening plan around your goals. Book online or call 0403 907 587.
This article is general information, not a diagnosis or a substitute for an individual assessment. If you are unsure about your symptoms, see a health professional.
