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Arthritis Res Ther. 2012; 14(3): R132.
Published online May 31, 2012. doi:  10.1186/ar3864
PMCID: PMC3446514
The relationship between hand osteoarthritis and serum leptin concentration in participants of the Third National Health and Nutrition Examination Survey
Mei Massengale,1,2 William M Reichmann,3,4,5 Elena Losina,1,2,3,4,5 Daniel H Solomon,1,2,6 and Jeffrey N Katzcorresponding author1,2,3,4,7
1Division of Rheumatology, Brigham and Women's Hospital, 75 Francis Street, Boston, MA 02115, USA
2Harvard Medical School, Longwood Avenue, Boston, MA 02115, USA
3Department of Orthopedic Surgery, Brigham and Women's Hospital, 75 Francis Street, Boston, MA 02115, USA
4Orthopaedic and Arthritis Center for Outcomes Research, Brigham and Women's Hospital, 75 Francis Street, Boston, MA 02115, USA
5Department of Biostatistics, Boston University School of Public Health, 715 Albany Street, Boston, MA 02118, USA
6Division of Pharmacoepidemiology and Pharmacoeconomics, Brigham and Women's Hospital/Harvard Medical School, 75 Francis Street, Boston, MA 02115, USA
7Department of Epidemiology, Harvard School of Public Health, 677 Huntington Avenue, Boston, MA 02115, USA
corresponding authorCorresponding author.
Mei Massengale: hmei/at/partners.org; William M Reichmann: wreichmann/at/partners.org; Elena Losina: elosina/at/partners.org; Daniel H Solomon: dsolomon/at/partners.org; Jeffrey N Katz: jnkatz/at/partners.org
Received February 10, 2012; Revised March 29, 2012; Accepted May 31, 2012.
Abstract
Introduction
Leptin has been suspected to contribute to the development of osteoarthritis (OA). However, this hypothesis has not been tested in large-scale hand OA cohorts. Our study aimed to determine whether there is a cross-sectional relationship between serum leptin levels and hand OA in a population-based sample of US adults.
Method
We used the Third National Health and Nutrition Examination Survey (NHANES III), a national cross-sectional population-based survey, to study the relationship between hand OA and serum leptin concentration. We applied previously established classification criteria for hand OA. Patients with rheumatoid arthritis were excluded. Potential confounders included sex, body mass index, the presence of polyarticular OA, diabetes, and total cholesterol. We estimated unadjusted mean leptin concentration by hand OA status and by all confounders. We further developed a linear regression model to assess mean leptin levels, adjusted for appropriate confounders.
Results
Of 2,477 subjects in the NHANES III sample that had a hand examination and did not have rheumatoid arthritis, 1,056 (42.6%) had a leptin measurement and were included in the analysis. Subjects with and without leptin measurement had similar demographic characteristics. We did not find any significant differences in mean serum leptin levels in subjects with symptomatic hand OA (7.38 ng/ml in males (95% confidence interval (CI) = 5.31, 9.46) and 21.55 ng/ml in females (95% CI = 17.08, 26.02)), asymptomatic hand OA (6.69 ng/ml in males (95% CI = 5.19, 8.18) and 17.09 ng/ml in females (95% CI = 15.00, 19.18)), and no hand OA (8.22 ng/ml in males (95% CI = 7.47, 8.97) and 20.77 ng/ml in females (95% CI = 18.01, 23.53)) in the unadjusted analysis. In a multivariable linear regression model that included variables of hand OA status, age, race/ethnicity, and obesity status, we found no statistically significant association between serum leptin and hand OA status.
Conclusions
In this cross-sectional study of a large representative US cohort, we did not find any evidence to support the hypothesis that serum leptin is associated with hand OA.
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