This manuscript was prepared using an Osteoarthritis Initiative (OAI) public use data set and does not necessarily reflect the opinions or views of the OAI investigators, the NIH, or the private funding partners.
Association of Metabolic Risk Factors With Cartilage Degradation Assessed by T2 Relaxation Time at the Knee: Data From the Osteoarthritis Initiative†
Version of Record online: 27 NOV 2013
Copyright © 2013 by the American College of Rheumatology
Arthritis Care & Research
Volume 65, Issue 12, pages 1942–1950, December 2013
How to Cite
Jungmann, P. M., Kraus, M. S., Alizai, H., Nardo, L., Baum, T., Nevitt, M. C., McCulloch, C. E., Joseph, G. B., Lynch, J. A. and Link, T. M. (2013), Association of Metabolic Risk Factors With Cartilage Degradation Assessed by T2 Relaxation Time at the Knee: Data From the Osteoarthritis Initiative. Arthritis Care Res, 65: 1942–1950. doi: 10.1002/acr.22093
- Issue online: 27 NOV 2013
- Version of Record online: 27 NOV 2013
- Accepted manuscript online: 7 AUG 2013 12:45PM EST
- Manuscript Accepted: 15 JUL 2013
- Manuscript Received: 18 DEC 2012
- NIH. Grant Numbers: U01-AR059507, P50-AR060752
- OAI. Grant Numbers: N01-AR-2-2258, N01-AR-2-2259, N01-AR-2-2260, N01-AR-2-2261, N01-AR-2-2262
- NIH, a branch of the Department of Health and Human Services
- OAI Study Investigators
- Merck Research Laboratories
- Novartis Pharmaceuticals Corporation
- Pfizer, Inc.
- Foundation for the NIH
To evaluate the association of metabolic risk factors with severity and 2-year progression of early degenerative cartilage changes at the knee, measured with T2 relaxation times in middle-aged subjects from the Osteoarthritis Initiative.
Cartilage segmentation and T2 map generation were performed in knee 3T magnetic resonance images from 403 subjects ages 45–60 years without radiographic osteoarthritis (OA). The influence of risk factors on baseline T2 and longitudinal progression of T2 was analyzed using linear regression, adjusting for age, sex, and other OA risk factors.
Four metabolic risk factors, i.e., high abdominal circumference (P < 0.001), hypertension (P = 0.041), high fat consumption (P = 0.023), and self-reported diabetes mellitus (P = 0.010), were individually associated with higher baseline T2. When the 4 metabolic risk factors were considered in a multivariate regression model, higher T2 remained significantly associated with abdominal circumference (P < 0.001) and diabetes mellitus (P = 0.026), and there was a trend for high fat consumption (P = 0.096). For the individual risk factors, only diabetes mellitus remained associated with higher baseline T2 after adjustment for body mass index (BMI). After adjustment for BMI, baseline T2 increased in a dose-response manner with the number of metabolic risk factors present (P = 0.032 for linear trend), and subjects with ≥3 metabolic factors (versus <3) had significantly higher baseline T2 (mean difference 1.2 msec [95% confidence interval 0.3, 2.1]; P = 0.011). Metabolic risk factors were not significantly associated with increases in T2 during followup.
Metabolic risk factors are associated with higher T2, suggesting that increased cartilage degeneration may be caused by modifiable metabolic disorders.