Osteoarthritis (OA) is the most common joint condition in the world, and possibly the most misunderstood. The phrase everyone learns is “wear and tear,” which conjures a joint grinding itself away like brake pads, and leads to the obvious conclusion that using it less will save it. That picture is mostly wrong, and acting on it usually makes people worse.
What OA actually is
OA is a whole-joint condition: cartilage thins and becomes less able to handle load, the bone beneath it remodels, the joint lining can become irritated, and the muscles around the joint weaken, often because pain has been quietly editing activity for years. It involves low-grade inflammation, not just mechanics. Notably, the X-ray and the pain frequently disagree. Severe-looking joints can be comfortable; mild-looking joints can be miserable. Pain comes from a sensitised joint and unconditioned tissues more than from the image.
And cartilage is not brake pad material. It is living tissue that responds to load, it has no blood supply, so it feeds by being compressed and released. Joints are built to move, and moderate, progressive loading is closer to maintenance than to damage.
The treatment with the best evidence
Exercise. For knee OA, Cochrane’s systematic review of land-based exercise programs, dozens of trials, found consistent improvements in pain and physical function, in the same ballpark as common pain medications, without the side effects. Hip OA shows a similar pattern. Every major guideline (Osteoarthritis Research Society International, the American College of Rheumatology, NICE in the UK) puts exercise, education, and weight management where relevant at the core of treatment, ahead of injections and far ahead of surgery.
What that looks like in practice
- Progressive strengthening around the affected joint, quadriceps and glutes for the knee and hip; this is the foundation, and “progressive” is the word people skip
- Aerobic exercise at whatever entry point is tolerable: walking, cycling, pool, building total weekly volume gradually
- Flare management: OA flares happen; the skill is reducing load briefly rather than stopping entirely, then rebuilding
- Load education: understanding that some discomfort during exercise in an arthritic joint is safe, the rule of thumb is pain that settles back to baseline within 24 hours
- Weight management where relevant: not a lecture, a lever, meaningful loss measurably reduces knee load and symptoms
Where other treatments fit
Medications and injections are your physician’s territory; some help some people for a while. Supplements have weak evidence. Surgery, joint replacement, is genuinely excellent for end-stage OA that has failed conservative care, and we refer people toward that conversation without hesitation when the picture fits. But a large share of people who assume they are “bone on bone” and headed for surgery find, after three months of proper loading, that they are not, or that they can comfortably delay it for years.
References
- Fransen M, McConnell S, Harmer AR, Van der Esch M, Simic M, Bennell KL. Exercise for osteoarthritis of the knee. Cochrane Database of Systematic Reviews. 2015;(1):CD004376. Summary: PMID 26405113
- Morin SN, Feldman S, Funnell L, et al. Clinical practice guideline for management of osteoporosis and fracture prevention in Canada: 2023 update. CMAJ. 2023. doi:10.1503/cmaj.221647 (for the bone-health side of joint care).
General information only, not medical advice. A single hot, swollen joint with fever is not typical OA, that needs prompt medical assessment.