Best Exercise for Knee Osteoarthritis: 217 Trials Show One Winner
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Knee osteoarthritis affects around 1 in 5 UK adults over the age of 45. Pain, stiffness and reduced mobility shape daily life. Many people stop moving because of fear the joint will wear down faster.
The science says the opposite. The right form of exercise is the most effective non-drug treatment. A 2025 BMJ network meta-analysis of 217 randomised trials and 15,684 patients names the winner.
Sources: BMJ 2025 (PMID 41093618). UK Biobank cohort study, Ann Rheum Dis 2025 (PMID 40216502). Versus Arthritis UK.
What the BMJ 2025 review found
The systematic review and network meta-analysis pooled 217 randomised trials and 15,684 patients with knee osteoarthritis. Researchers tested aerobic exercise, strengthening, flexibility, mind-body, neuromotor, and mixed exercise against control groups. They measured pain, function, walking ability and quality of life at 4, 12 and 24 weeks.
The result was clear. Aerobic exercise produced the largest improvements in pain and function across short and mid-term follow-up, with moderate certainty evidence. The standardised mean difference for short-term pain reduction was minus 1.10 (95 percent CI minus 1.68 to minus 0.52). The authors recommend aerobic exercise as a first-line option for managing knee osteoarthritis.
Why walking, cycling and swimming work
These three modalities load the knee through smooth, repeated cycles. They build cardiovascular fitness without high impact. The motion improves joint lubrication, leg strength endurance and circulation around the knee. Pain falls as fitness rises.
Your body responds better to consistent, low-grade work than to occasional heavy sessions when the joint is sore. Cartilage relies on movement for nourishment because the tissue has no direct blood supply. Compressive cycles from walking and cycling pump fluid in and out of cartilage and feed the joint surface.
UK Biobank: how many steps protect your knees
A 2025 UK Biobank cohort study tracked 89,969 adults for a mean of 6.85 years. Researchers measured purposeful walking using wrist accelerometers, defined as steps at a cadence of 60 or more per minute (the kind of walking with intent, not gentle pottering).
People walking 8,000 or more purposeful steps a day had a 26 percent lower hazard of developing symptomatic knee osteoarthritis compared with those walking under 4,000. Risk dropped steadily up to 8,000 steps, then plateaued.
Source: He H, Wang Y, Hunter D, et al. Association of walking with incident knee osteoarthritis. Ann Rheum Dis. 2025, vol 84, issue 4, pages 632 to 642. PMID 40216502. Dashed lines show 95 percent CI band.
What NICE recommends in the UK
The NICE guideline NG226, published in 2022, names therapeutic exercise as the first-line treatment for osteoarthritis in adults aged 16 and over. Painkillers are second line. NICE recommends weight loss for adults carrying extra weight, since every pound lost takes around four pounds of force off the knee with each step.
NICE supports tailored, regular sessions. Supervised exercise improves adherence, and adherence drives results.
A four-step plan to start this week
If you walk 3,000 steps now, aim for 4,000 next week. Add 500 to 1,000 steps each week until you reach 8,000 purposeful steps a day.
Walk at a pace where breath sits a bit faster than at rest. Cadence above 100 steps per minute counts as moderate intensity for most adults.
Swap a walking day for cycling or pool walking when the knee feels stiff. Both reduce joint load while keeping the legs working.
Sit-to-stand from a chair, wall sits, step-ups onto a low box, and slow part-range squats protect the muscles around the knee.
Keep sessions short and frequent. Twenty to thirty minutes most days outperforms one long weekend session. Pain should ease as fitness builds. Mild next-day soreness is normal. Sharp pain or visible swelling means dial back the volume.
When to get professional help
A physiotherapist or qualified personal trainer guides progression and form. If pain interferes with sleep or stairs, book a GP appointment for proper assessment. Pain lasting more than 24 hours after a session, or visible swelling, also warrants a review.
Bottom line
You do not need to live with knee pain or wait for things to worsen. Walk often. Build slowly. Add light strength work twice a week. The evidence is strong and the actions are simple.
For a tailored programme built around your knees, age and goals, visit www.dushyantatomar.com. Every plan is built around evidence and progressive load.
Dushyanta Tomar, MSc Applied Sports and Exercise Physiology, CIMSPA Accredited Personal Trainer.
Sources
- Yan L, Li D, Xing D, et al. Comparative efficacy and safety of exercise modalities in knee osteoarthritis: systematic review and network meta-analysis. BMJ. 2025, vol 391, e085242. PMID 41093618. pubmed.ncbi.nlm.nih.gov/41093618
- He H, Wang Y, Hunter D, Zhang Y, Zhang W, Doherty M, White DK, Wei J, Zeng C, Lei G. Association of walking with incident knee osteoarthritis: a prospective cohort study using data from the UK Biobank. Ann Rheum Dis. 2025, vol 84, issue 4, pages 632 to 642. PMID 40216502. pubmed.ncbi.nlm.nih.gov/40216502
- National Institute for Health and Care Excellence. Osteoarthritis in over 16s: diagnosis and management. NICE Guideline NG226. 2022. nice.org.uk/guidance/ng226
This article is for general information and is not a substitute for personalised medical advice. Speak with a qualified health professional about your knee health before starting a new programme.