Knee Osteoarthritis: Exercise Is Medicine

Of all the diagnoses people arrive with, knee osteoarthritis is the one that carries the most defeatism. Patients tell me they have been told it is wear and tear, that it will only get worse, and that there is nothing to do but manage until a replacement. Many have quietly stopped walking as far, stopped the stairs where they can, and started avoiding the very things that would help.

I want to push back on that, because it is one of the areas where the gap between what people believe and what the evidence supports is widest. Knee arthritis physiotherapy is not a holding pattern before surgery. Exercise is the recommended first-line treatment for knee osteoarthritis, and for a great many people it works well.

What knee osteoarthritis actually is

The tyre analogy has a lot to answer for. Osteoarthritis is not a passive process of a surface grinding down until it runs out. It is an active condition affecting the whole joint: the cartilage, the bone underneath it, the joint lining, the capsule and the surrounding muscles. There is a cycle of tissue breakdown and attempted repair going on, and because it is active, it can be influenced.

That is the crucial point. A joint that responds to what you do is a joint you have some say over.

What it feels like

The usual picture is:

• Pain that is worse with activity, particularly stairs, hills, kneeling and getting out of a low chair, and eases with rest
• Stiffness first thing in the morning that loosens within about half an hour
• Stiffness after sitting still, so the first few steps out of the car are the worst ones
• Swelling that comes and goes, often after a busier day
• Grating, creaking or crunching, which sounds worse than it is
• A joint that feels like it might give way, usually because the muscle is weak rather than because anything is unstable

It also fluctuates. Good weeks and bad weeks are the norm, and a bad flare does not mean the joint has deteriorated.

Who gets it and why

Age is the biggest factor, but it is not simply a matter of years. Previous significant knee injury, especially a cruciate ligament rupture or a meniscal tear, raises the risk considerably. So does carrying extra weight, partly through load and partly through metabolic effects. Family history plays a part. Some occupations involving heavy lifting and prolonged kneeling contribute.

Recreational exercise, notably running, does not. That is a persistent myth and the evidence does not support it.

What a scan does and does not tell you

X-ray findings and symptoms match each other poorly. Plenty of people have marked changes on imaging and very little pain, and plenty have significant pain with modest changes. This is why current guidance often supports diagnosing knee osteoarthritis clinically, from your age, symptoms and examination, without imaging at all.

So if you have a report using words like severe or bone-on-bone, please do not read it as a prognosis. It describes the picture, not your future.

What an assessment involves

I want to know how the pain behaves over a day and a week, what you have stopped doing, what you are afraid of doing, and what you would most like to get back to. Then I examine the knee's range of movement, test the strength of the quadriceps, glutes and calves, look at the hip and ankle, watch you walk, and see how you manage stairs and a sit-to-stand.

From that, we set an actual goal. Not "manage the arthritis", but walking to the shops without stopping, getting round the golf course, or being able to kneel in the garden again.

Exercise as the core treatment

Therapeutic exercise is recommended as a core treatment for osteoarthritis in national guidance, and the evidence base behind it is substantial and consistent. It reduces pain, improves function and improves quality of life. It has no meaningful side effects. It also happens to be the only option that improves the tissue rather than just muting the symptom.

Two things I say to nearly everyone:

Exercise will not wear the joint out further. Loading the knee in a graded way is what keeps cartilage nourished and muscle strong.

Some pain during exercise is acceptable. A commonly used rule is that discomfort up to a moderate level is fine, provided it settles within about 24 hours and is not building week on week. Waiting for pain-free before you exercise means never starting.

What a programme looks like

Strength. The centrepiece. Sit-to-stands, step-ups, wall squats to a comfortable depth, and calf raises, progressed over weeks by adding repetitions, then load. Quadriceps strength in particular tracks closely with knee function.

Range and mobility. Gentle work to restore full straightening and bending, which matters more than most people realise for walking efficiency.

Aerobic exercise. Walking, cycling, swimming or a cross trainer. This helps pain, mood, sleep and weight, and cycling is often the kindest starting point for a very irritable knee.

Balance and control. Because a knee that feels unreliable changes how you move everywhere else.

The programme needs to be progressive and it needs to run for months, not weeks. That is the honest bit. Benefits typically build over about three months of consistent work, and they fade if you stop, in exactly the way strength does.

What else helps

Weight management makes a real difference where it applies, because the knee experiences several times body weight during walking and stairs. Topical anti-inflammatory gel is a sensible first-line option for knee osteoarthritis and worth discussing with your pharmacist. Cushioned, supportive footwear helps. A stick used in the opposite hand can unload a painful knee noticeably during a flare. Steroid injections can buy a useful window of relief for a bad flare, and are best used to enable rehabilitation rather than as a standalone answer.

Keyhole surgery to tidy up a degenerate knee is no longer recommended for osteoarthritis. Joint replacement is an excellent operation, but it is for people whose symptoms remain severe despite a proper trial of conservative treatment, and it is worth being strong going into it.

When to seek help

Get medical advice promptly if the knee locks or gives way suddenly, if it swells rapidly after an injury, if you cannot bear weight, or if pain is severe at night and unrelated to activity.

Seek urgent care for a hot, red, very swollen and exquisitely painful knee, particularly with fever or feeling generally unwell, which needs infection ruled out.

Otherwise, if your knee has been limiting you for months, the sooner you start a structured programme the better it works. I see a lot of this across Liverpool and Merseyside, and home visits mean we can work with your actual stairs and your actual chair. There is more on my pages for knee pain and musculoskeletal physiotherapy.

To book an assessment, go to /portal/book or call me on +44 7553 370300. Home visits across Liverpool and Merseyside are £90 a session, online video consultations £60 UK-wide, evenings Monday to Friday, plus Saturday and Sunday daytimes, no GP referral needed.