Abstract
ASSOCIATION BETWEEN METABOLIC SYNDROME AND KNEE PAIN IN MIDDLE-AGED ADULTS OVER 10-13 YEARS
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A. Singh, B. Fraser, A. Venn, L. Blizzard, G. Jones, C. Ding, B. AntonyUniversity of Tasmania, Menzies Institute for Medical Research, Hobart, Australia
Background Metabolic syndrome (MetS) is characterized by an increased waist circumference, dyslipidaemia (elevated triglycerides and reduced high-density lipoprotein (HDL)), hypertension and hyperglycaemia. MetS has been suggested as having a role in osteoarthritis (OA) pathogenesis. Few studies have described the association of MetS with joint pain in older adults with OA; however, none has described the association between MetS and knee pain in a middle-aged adult population.
Objectives We aimed to describe the association of MetS and trajectories of MetS over 10-13 years with knee symptoms in general population-based middle-aged adults.
Methods Fasting blood biochemistry, waist circumference and blood pressure measures collected during the Childhood Determinants of Adult Health (CDAH)-1 study (year:2004-6; n = 2447) and at 10-13 year follow-up at CDAH-3 (n = 1549) were used to define MetS using the International Diabetes Federation (IDF) definition. Knee symptoms were assessed using the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) scale at the CDAH-3 follow-up (mid-adulthood). Univariable and multivariable (adjusted for age, sex, and body mass index (BMI)) zero-inflated Poisson (ZIP) regression models were used for analysis.
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Results Overall, the prevalence of MetS increased from 8% (mean age:31.48±2.60; female:52.06%) to 13% (mean age: 44±2.90; female: 53.78%) over 10-13 years. Four MetS trajectories were identified—‘No MetS’ (85.01%); ‘Improved MetS’ (2.14%), ‘Incident MetS’ (8.81%), and ‘Persistent MetS, (4.04%). The presence of MetS at any point, compared to no MetS, was significantly associated with worse knee symptoms at follow-up. Notably, ‘Incident MetS’ was most strongly associated with knee symptoms [RoM: 1.56;95%CI: 1.48,1.65] and pain [RoM:1.52;95%CI:1.37,1.70] at follow-up (Table 1).
Table 1. Association between trajectories of metabolic syndrome and knee symptoms
Variable (Type)
Association of MetS with knee symptoms at CDAH-3
Unadjusted RoM (95% CI)p-value
Adjusted
RoM (95% CI)p-value
Four trajectories of MetS status from CDAH-1 to CDAH3 (Predictor)
WOMAC total (outcome)
No MetS (Predictor)
1 (Ref)
1 (Ref)
Improved MetS (Predictor)
1.44 (1.24, 1.66)p<0.001
1.22 (1.05, 1.41)P=0.009
Incident MetS (Predictor)
1.80 (1.71, 1.90)p<0.001
1.56 (1.48, 1.65)p<0.001
Persistent MetS (Predictor)
1.45 (1.35, 1.56)p<0.001
1.15 (1.06, 1.25)P=0.001
Ptrend
p<0.001
p<0.001
WOMAC pain (outcome)
No MetS (Predictor)
1 (Ref)
1 (Ref)
Improved MetS (Predictor)
1.12 (0.83, 1.52)p=0.444
0.96 (0.71, 1.31)P=0.804
Incident MetS (Predictor)
1.69 (1.53, 1.87)p<0.001
1.52 (1.37, 1.70)p<0.001
Persistent MetS (Predictor)
1.23 (1.06, 1.42)P=0.005
1.02 (0.87 1.20)p<0.804
Ptrend
p<0.001
p<0.001
WOMAC Stiffness (outcome)
No MetS (Predictor)
1 (Ref)
1 (Ref)
Improved MetS (Predictor)
1.38 (0.95, 2.01)p=0.090
1.20 (0.81, 1.77)P=0.363
Incident MetS (Predictor)
1.27 (1.10, 1.46)p=0.001
1.16 (0.99, 1.35)p=0.066
Persistent MetS (Predictor)
1.26 (1.03, 1.53)P=0.022
1.06 (0.84, 1.33)P=0.621
Ptrend
p<0.001
P=0.166
WOMAC Function (outcome)
No MetS (Predictor)
1 (Ref)
1 (Ref)
Improved MetS (Predictor)
1.23 (1.02, 1.47)p=0.028
1.05 (0.88, 1.27)P=0.571
Incident MetS (Predictor)
1.76 (1.65, 1.87)p<0.001
1.56 (1.45, 1.67)p<0.001
Persistent MetS (Predictor)
1.45 (1.32, 1.59)p<0.001
1.16 (1.05, 1.29)P=0.005
Ptrend
p<0.001
p<0.001
BMI: body mass index, CDAH: Childhood Determinants of Adult Health, CI: confidence interval, n: number of patients at the respective time point, MetS: metabolic syndrome, RoM: ratio of means; WOMAC: Western Ontario MacMaster osteoarthritis score
Model adjusted for age, sex, and BMI
Bold denotes statistical significance, p<0.05
Conclusion In a middle-aged population-based sample, there was an independent positive association between MetS and knee symptoms. The MetS developed in mid-adulthood was most strongly associated with knee symptoms compared to those who had MetS in young adulthood or at both time points.
Acknowledgements AS is supported by the International Graduate Research Scholarship, University of Tasmania.
Disclosure of Interests None Declared.
Keywords: Pain, Osteoarthritis, Epidemiology
DOI: 10.1136/annrheumdis-2023-eular.258Citation: , volume 82, supplement 1, year 2023, page 442Session: Touring the landscape of epidemiology
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Hobart, Australia