The Study
Weight loss reduces knee-joint loads in overweight and obese older adults with knee osteoarthritis.
This study shows that in older people who are overweight and have knee arthritis, losing weight is linked to less force on the knee when walking. It doesn’t prove that weight loss directly causes the lower force, but they do go together.
Analysis score
Maximum 72 for a cohort study.
Where the score came from
When heavy older people with bad knees lose weight, their knees don’t have to work as hard when walking.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 546 / 100
Quality score
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes, because people take thousands of steps a day, so this adds up to big relief for the knees over time.
- 2Losing 1 kg (2.2 lbs) cuts knee force by about 4 kg per step.
- 3That’s like removing 4 backpacks every step instead of just 1.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Arthritis and rheumatism
Year
2005
Authors
S. Messier, D. J. Gutekunst, C. Davis, P. Devita
Related Content
Claims (6)
If older adults with extra weight and knee arthritis lose 1 kilogram, their knees experience about 4 times less force with each step — which could really add up to less wear and tear over time.
If older adults who are overweight or obese and have knee arthritis lose 1 kilogram of weight, their knees experience less strain when walking — about 1.4% less stress per kilo lost — which might help protect the inner part of the knee.
If you're an older adult who doesn't move much and has extra weight plus knee arthritis, carrying more body weight means your knees get squished harder when you walk.
If older adults who are overweight or obese have knee arthritis, carrying less weight means their knees feel less force when they walk — and that’s backed by solid data.
If older adults who are overweight or obese and don't move much have less weight, their knees may twist less when they walk — which could be easier on their joints.
Losing a little weight can really help your knees — for every pound you lose, your knees feel about four pounds less pressure when you walk.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.