Knee Osteoarthritis: What Helps, What Does Not, and When Surgery Is Right
Bones & Joints

Knee Osteoarthritis: What Helps, What Does Not, and When Surgery Is Right

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Knee osteoarthritis is the most common cause of joint pain in adults over 50, and the advice people receive about it is unusually mixed. Some widely used treatments have strong evidence, several popular ones have almost none, and the one intervention people most want to avoid is often the most effective.

What the condition actually is

Osteoarthritis was long described as simple cartilage wear. It is better understood as a disorder of the whole joint: cartilage thins and its surface roughens, the underlying bone thickens and forms spurs, the synovial lining becomes intermittently inflamed, ligaments and the joint capsule stiffen, and the muscles around the joint weaken.

That matters because it explains why pain and X-ray appearance correlate poorly. People with severe X-ray changes can have little pain, and people with mild changes can be significantly disabled.

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Typical symptoms

  • Pain on weight bearing, particularly stairs, squatting and rising from a chair
  • Morning stiffness lasting under 30 minutes
  • Stiffness after sitting still, easing after a few minutes of walking, often called gelling
  • Crepitus, a grating or crackling sensation
  • Intermittent swelling
  • Reduced bending or straightening range
  • Bow-leg or knock-knee deformity in advanced cases

Pain that is worse at rest, prolonged morning stiffness beyond an hour, marked swelling, fever or involvement of many joints points away from osteoarthritis and towards an inflammatory arthritis, which needs different treatment.

Treatments with good evidence

Exercise therapy. This is first-line and is as effective as anti-inflammatory medication in several comparisons. Quadriceps and hip strengthening, range-of-motion work and a progressive aerobic component. Stationary cycling, walking and water-based exercise are all well tolerated. Effects take six to twelve weeks and reverse if you stop, so it is a permanent habit rather than a course.

Weight loss. Each kilogram of body weight translates to roughly three to four kilograms of load at the knee during walking. Losing 5-10 percent of body weight produces clinically meaningful pain reduction, and combining weight loss with exercise outperforms either alone.

Education and self-management. Understanding that activity does not accelerate damage changes behaviour and outcomes.

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Topical anti-inflammatory gel. Effective for knee osteoarthritis with far less systemic risk than tablets, and often the sensible first medication.

Oral anti-inflammatories. Effective but with stomach, kidney, blood pressure and cardiovascular considerations, particularly in older adults. Used at the lowest effective dose for the shortest period.

Walking aids and appropriate footwear. A cane in the opposite hand reduces knee load substantially and is underused because of appearance rather than function.

Treatments with weak or mixed evidence

Glucosamine and chondroitin. Large independent trials have not shown benefit over placebo for most patients. Harmless, but the cost is real.

Steroid injections. Give short-term relief, typically a few weeks. Repeated frequent injections may accelerate cartilage loss, so they are used selectively for flares.

Hyaluronic acid injections. Guidelines disagree sharply. Benefit, if present, is small.

Platelet-rich plasma and stem cell injections. Marketed heavily and priced highly. Evidence remains inconsistent, and preparations are not standardised between clinics.

Arthroscopic washout and debridement. Multiple trials show no benefit over sham surgery for osteoarthritis, and guidelines advise against it. It remains appropriate for a genuine mechanical block from a displaced meniscal fragment.

Paracetamol. Effect size is small, though it is safe and sometimes helpful as an adjunct.

When surgery makes sense

Total or partial knee replacement is considered when pain limits daily life, sleep is disturbed, walking distance is significantly reduced, and adequate non-surgical treatment over a reasonable period has not worked.

Outcomes are good: around 80-90 percent of patients report substantial pain relief, and modern implants commonly last 15-20 years or more. Risks include infection, clots, stiffness and persistent pain in a minority. Rehabilitation effort in the first three months strongly influences the result, and strengthening the leg before surgery improves recovery.

Age alone is not a barrier, and delaying until you are much less mobile tends to worsen the outcome rather than improve it.

A reasonable sequence

  1. Weight management and a structured exercise programme, with a physiotherapist if available
  2. Topical anti-inflammatory gel, plus a walking aid if needed
  3. Oral analgesia for flares, at the lowest useful dose
  4. Selective steroid injection for a bad flare
  5. Surgical opinion when function, not the X-ray, says the time has come

This is general information, not a treatment plan. Medication choices depend on your kidney function, stomach history and heart risk, so discuss them with your doctor.