Osteoarthritis
Not simply wear and tear
What it is
Osteoarthritis is a disease of the whole joint — cartilage, underlying bone, ligaments, and the joint lining — involving active tissue remodelling and low-grade inflammation. It most commonly affects the knees, hips, hands, and spine, causing pain, stiffness, and loss of function.
Why it matters
Osteoarthritis is the leading cause of disability in older adults, and it is widely misunderstood in a way that directly harms people. It is not simply a tyre wearing out. That framing leads to the single most damaging belief in this condition — that exercise will 'wear the joint out faster' — when exercise is in fact the best-evidenced treatment there is. People avoid the one thing that would help them because of a metaphor.
What BioSignal knows about treating this
What works for Osteoarthritis
BioSignal’s clinical summary, most important first.
- EXERCISE — the best-evidenced treatment. Strengthening and aerobic exercise reduce pain and improve function
- Weight loss where relevant (substantially reduces knee pain and slows progression)
- Topical NSAIDs (first-line pharmacological option for knee OA)
- Oral NSAIDs (short courses; weigh gastrointestinal, kidney, and cardiovascular risk)
- Physiotherapy and self-management education
- Joint replacement for end-stage disease — highly effective
- NOT supported: arthroscopic surgery for degenerative knee disease; glucosamine and chondroitin
Signal Records relevant to this condition
Interventions and contributing factors — some of these records describe a cause rather than a cure. The rating shown is BioSignal’s confidence in that Signal Record, not a claim about how well it treats this condition. Open any of them for the full evidence.
- Glucosamine & ChondroitinModerate confidence
One of the world's best-selling supplements, and the best trials say it doesn't work. Very safe — the cost is money, and displacing the exercise that does work.
- Curcumin (Turmeric)Limited evidence
Thousands of studies, no approved drug — because curcumin is barely absorbed and a known false positive in lab assays. Modest osteoarthritis relief is its one credible claim.
- CollagenModerate confidence
Real but modest evidence for skin hydration and elasticity, heavily shadowed by industry funding. Not established for joints, bone, tendon, hair or nails. It is an incomplete protein and does not build muscle. For skin, a retinoid and sunscreen have far better evidence and cost far less.
- BoronLimited evidence
Not established as essential. The testosterone claim is a change in hormone binding, not a demonstrated benefit — from studies far too small to conclude from.
- Vitamin DHigh confidence
Effective for deficiency and for bone health in at-risk groups. For broad disease prevention in adults who are already replete, the largest trials are null — and confidence in that null is high. Routine testing of healthy adults is not supported.
New to this? Read these first
How this usually unfolds
- Recognize risk factors
- Get diagnosed
- Track key biomarkers
- Lifestyle first
- Evidence-based treatment
- Long-term monitoring
Who is at risk
- Older age
- Obesity (both mechanical load and metabolic/inflammatory effects — hands are affected too, which load alone cannot explain)
- Previous joint injury (a torn ligament or meniscus markedly raises risk)
- Female sex
- Genetics
- Occupational or repetitive high joint loading
- Joint malalignment
How it's diagnosed
Osteoarthritis is diagnosed clinically — from history and examination — in adults with typical activity-related joint pain and stiffness. X-rays are frequently NOT required, and this matters: radiographic findings correlate poorly with symptoms. Plenty of people with dramatic X-rays have no pain, and plenty with severe pain have unremarkable images. Treating the picture rather than the person is a common error.
Key biomarkers
Lifestyle
Explore this condition across BioSignal
Related Foundations
Related Signal Records
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Frequently asked questions
Won't exercise wear my joints out faster?
This is the most harmful belief in osteoarthritis, and it is understandable — the 'wear and tear' metaphor invites it. But joints are not tyres. They are living tissue that responds to load, and exercise is the single best-evidenced treatment for osteoarthritis: it reduces pain and improves function. Strong muscles around a joint protect it. Avoiding movement weakens the muscles, stiffens the joint, and makes the pain worse. The metaphor is costing people their mobility.
My X-ray looks terrible. Does that mean my pain will be terrible?
Not necessarily, and this genuinely surprises people. X-ray findings correlate poorly with symptoms — many people with severe-looking imaging have little pain, and many with significant pain have unremarkable films. Your function and your symptoms matter more than the picture, and it is one reason routine X-rays often are not needed to make the diagnosis.
Do glucosamine and chondroitin work?
The best-quality trials say no. These are among the most-purchased joint supplements in the world, and high-quality randomised evidence does not support meaningful benefit over placebo for pain or structure. If you find them helpful and they are affordable, the harm is low — but they should not displace exercise and weight management, which do work.
Should I have keyhole surgery to clean out the joint?
For degenerative knee disease, generally no — and this is one of medicine's clearer negative findings. Arthroscopic surgery for degenerative meniscal tears and osteoarthritis has repeatedly failed to outperform sham surgery or structured exercise therapy. It remains widely performed. Joint replacement for genuinely end-stage disease, by contrast, is highly effective.
Evidence summary
Exercise therapy has strong randomised evidence for reducing pain and improving function in osteoarthritis and is recommended as core treatment in all major guidelines. Weight loss has strong evidence in knee OA. Topical NSAIDs are effective and first-line. Arthroscopic surgery for degenerative knee disease has repeatedly failed to outperform sham or exercise therapy. Glucosamine and chondroitin are not supported by high-quality trials. Curcumin has modest, low-quality evidence for pain relief. Joint replacement is highly effective in end-stage disease.
References & sources
- OARSI and ACR guidelines for the management of osteoarthritis
- NICE guideline: Osteoarthritis in over 16s
- Randomised and sham-controlled trials of arthroscopic surgery for degenerative knee disease
- Exercise therapy meta-analyses in knee and hip OA
Educational information — not medical advice
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