Obesity and Osteoarthritis Epidemiology

Obesity and osteoarthritis are interlinked through both mechanical and metabolic pathways, making their epidemiology a global health priority. Excess body weight increases joint loading, particularly at the knee and hip, accelerating cartilage breakdown and joint degeneration. Concurrently, adipose tissue acts as an endocrine organ, secreting pro-inflammatory mediators that contribute to systemic low-grade inflammation and local joint pathology. The prevalence of osteoarthritis rises with age and body mass index (BMI), with women and socioeconomically disadvantaged populations bearing a disproportionate burden. Life-course exposure to obesity, including durations of central or general adiposity, has emerged as a stronger predictor of osteoarthritis risk than cross-sectional measures alone. As global obesity rates climb, understanding the relative contributions of fat distribution, weight history and metabolic disturbances is crucial for devising targeted prevention and intervention strategies that can alleviate pain, preserve function and reduce health-care costs.

Research from Nature Portfolio

Large-scale cohort analyses have quantified the distinct impacts of general and central obesity on knee osteoarthritis risk, demonstrating that individuals with both elevated BMI and waist circumference exhibit the highest incidence. Remarkably, even modest weight loss or remission of obesity over two years was associated with a significant reduction in new-onset knee osteoarthritis, underscoring the value of weight management. Complementary cross-sectional work stratifying patients by obesity severity revealed a dose–response relationship between BMI categories and clinical outcomes: higher BMI correlated with greater pain intensity, functional limitation and negative beliefs about joint health. These findings support tailored obesity reduction as a modifiable target to slow disease progression and improve patient-reported outcomes.

Obesity and Osteoarthritis Epidemiology publication trend

The graph below shows the total number of articles in obesity and osteoarthritis epidemiology across all publications each year (not limited to Nature Index journals).

Technical terms

Body mass index (BMI): A ratio of weight to height squared (kg/m2) used to classify general obesity.

Central obesity: Excess fat accumulation around the abdomen, often measured by waist circumference.

Adipokine: A bioactive protein secreted by adipose tissue that modulates inflammation and metabolism.

Body roundness index (BRI): An anthropometric measure integrating waist circumference and height to estimate body fat distribution.

Mendelian randomisation: A genetic epidemiology method using inherited variants as proxies to infer causal relationships between risk factors and disease.

References

1. Maximum lifetime body mass index is the appropriate predictor of knee and hip osteoarthritis. Archives of Orthopaedic and Trauma Surgery (2017).
2. Association of general and central obesity, and their changes with risk of knee osteoarthritis: a nationwide population-based cohort study. Scientific Reports (2023).
3. Level of obesity is directly associated with the clinical and functional consequences of knee osteoarthritis. Scientific Reports (2020).
4. Association between body roundness index and osteoarthritis: a cross-sectional analysis of NHANES 2011–2018. Frontiers in Nutrition (2024).
5. Pathogenic Mechanisms and Therapeutic Approaches in Obesity-Related Knee Osteoarthritis. Biomedicines (2023).
6. Causal Relationships of General and Abdominal Adiposity on Osteoarthritis: A Two-Sample Mendelian Randomization Study. Journal of Clinical Medicine (2022).