Osteoarthritis: Why Movement Helps a Worn Joint, and What the X-ray Does Not Tell You

Two beliefs make osteoarthritis worse, and almost everyone arrives holding both.

The first is that it is simple wear and tear, so using the joint uses it up. It is not, and the opposite is true: exercise is the single most effective treatment there is for osteoarthritis pain and function. Cartilage has no blood supply of its own and depends on movement to be nourished. A joint that stops moving gets stiffer, the muscles supporting it weaken, and it hurts more. Resting a painful arthritic joint is the intuitive thing and the wrong thing.

The second is that the X-ray tells you how bad it is. It does not. The correlation between what a joint looks like on imaging and how much it hurts is genuinely poor. Plenty of people have marked changes on an X-ray and no pain at all; plenty have severe pain with modest changes. That cuts both ways, and the useful consequence is that a discouraging X-ray is not a forecast — how you move and how strong the surrounding muscle is will affect your next ten years more than the picture does.

What it is, and what it is not

Osteoarthritis is the gradual breakdown of joint cartilage, with changes to the bone underneath and — importantly — inflammation. The old description as purely mechanical wear is out of date, which is part of why the treatments that work are not only mechanical.

Most often the knees, hips, hands, lower back and neck.

Typical: pain that is worse with use and better with rest, stiffness after sitting or in the morning that eases within about 30 minutes, a grinding or crunching sensation, gradual loss of range, sometimes swelling.

Not typical, and worth telling us: stiffness lasting more than an hour in the morning, several joints inflamed symmetrically, hot swollen joints, fever, weight loss, night pain that wakes you, or joint pain with a rash. Those point at inflammatory arthritis or something else, and those conditions are treated completely differently — which is why a proper diagnosis matters rather than assuming any joint pain after fifty is osteoarthritis.

What actually works

Ranked honestly, which puts the free things first.

1. Exercise. It is the treatment, not the supplement to it. Two kinds, both needed:

• Strengthening the muscles around the joint. For knees, that is largely quadriceps. Stronger muscle takes load off the joint surface, and this is where most of the benefit lives
• Low-impact aerobic movement — walking, cycling, swimming, water exercise

Two things to expect, because they are why people stop. It often hurts a little more for the first week or two. And the benefit takes six to twelve weeks to arrive. Nothing about that means it is not working — it means the timescale is longer than a painkiller’s, which is the comparison people make.

2. Losing weight, if you carry extra, and for the knees especially. The load through a knee is several times body weight when walking, so a small loss removes a disproportionate amount of force. Combining weight loss with exercise works better than either alone.

3. Physical therapy, particularly at the start, to get the exercise right and progressed properly. This is where a supervised start earns its cost.

4. Heat and cold, whichever helps you. Heat for stiffness, cold for a flare. No downside.

5. A stick or a brace, used properly. Not a defeat — a stick in the opposite hand to a painful hip or knee unloads it substantially. Get the height right.

6. Sensible shoes. Cushioned, supportive, low heel. It matters more than most people expect.

7. Sleep and mood, genuinely. Pain, poor sleep and low mood form a loop that runs in every direction, and treating any one of them helps the others. This is not a suggestion that the pain is in your head — it is how pain works.

Medication, briefly and honestly

Acetaminophen is safe for many people and modest in effect.

NSAIDs like ibuprofen and naproxen work better — and carry real risks with regular use: stomach bleeding, kidney injury, raised blood pressure, and cardiovascular risk. They matter more if you are older, have kidney disease, heart failure, high blood pressure, or take a blood thinner. Topical NSAIDs — gels rubbed into a knee or a hand — give much of the benefit with far less of the risk, and are underused. Worth asking about.

Steroid injections can help a flare, with relief typically measured in weeks to a few months, and a limit on how often they are sensible.

Opioids are not a good treatment for osteoarthritis. Modest benefit, real harm with long-term use.

Glucosamine and chondroitin: the evidence is weak. Some people feel they help and they are largely harmless. Turmeric and fish oil have some evidence for inflammatory pain and are not dramatic. Tell us what you are taking — glucosamine interacts with warfarin, and several supplements matter clinically.

Joint replacement is a genuinely excellent operation for a hip or knee that has stopped responding to everything else. It is a decision based on your pain and your function, not on your X-ray or your age. The usual question worth asking yourself is whether the joint is stopping you doing the things that matter to you.

Call us if

• Joint pain that is limiting what you do, or waking you at night
• Morning stiffness lasting more than an hour, or several joints inflamed at once
• A hot, swollen, very painful joint, especially with fever — that needs seeing urgently, because joint infection is a medical emergency
• A joint that gives way, locks, or catches
• Sudden severe pain, or pain after a fall
• Rapidly worsening function
• You are taking ibuprofen or naproxen most days — that is worth reviewing rather than continuing indefinitely
• Pain that has stopped responding to what used to work
• You have stopped doing something you value because of a joint. That is the sentence that starts the useful conversation

The Arizona part

Our climate is genuinely kind to arthritic joints, and it hands you the two best treatments for most of the year.

Water. Pools are everywhere in the Valley, and water exercise is close to ideal for osteoarthritis — you can strengthen and move with a fraction of the joint load. A warm pool is better still for stiffness. For many people here this is the most accessible effective treatment available, and it is available almost year-round.

And the walking season. October to April is as good as it gets anywhere for getting outside, which matters because the exercise that works for arthritis is the exercise you keep doing. Start in November.

Two honest notes.

The famous one: does dry heat help? Many people genuinely report less stiffness here and it is one of the common reasons for moving to Arizona. The evidence for barometric pressure and humidity affecting arthritis pain is mixed and modest. If you feel better here, that is real and worth having — and it is not a reason to skip the strengthening, which is what actually changes the trajectory.

And a summer caution that is specific to these medicines. Regular NSAID use plus dehydration is hard on the kidneys, and in a Phoenix summer dehydration is easy. If you take ibuprofen or naproxen regularly, drink more than you think you need in the hot months, and if you also take a blood pressure medicine or a diuretic, that combination deserves one conversation with us rather than a summer of guessing. Our heat safety page covers the rest.

Sources

23. Osteoarthritis — MedlinePlus Medical Encyclopedia, U.S. National Library of Medicine. https://medlineplus.gov/ency/article/000423.htm

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