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Obesity Contributes to Rapid Cartilage Loss
Date:7/14/2009

t diagnosis exhibit fast disease progression," Dr. Roemer said. "So we set out to identify baseline risk factors that might predict rapid cartilage loss in patients with early knee osteoarthritis or at high risk for the disease."

The researchers recruited patients from the Multicenter Osteoarthritis (MOST) Study, a prospective study of 3,026 people, age 50 - 79, at risk for osteoarthritis or with early x-ray evidence of the disease. The study is funded by the National Institute on Aging.

Dr. Roemer's study consisted of 347 knees in 336 patients. The patient group was comprised of 65.2 percent women, mean age 61.2, with a mean BMI of 29.5, which is classified as overweight. Recommended BMI typically ranges from 18.5 to 25. Only knees with minimal or no baseline cartilage damage were included. Of 347 knees selected for the study, 20.2 percent exhibited slow cartilage loss over the 30-month follow-up period and 5.8 percent showed rapid cartilage loss. Rapid cartilage loss was defined by a whole organ magnetic imaging score of at least 5, indicating a large full thickness loss of 75 percent in any subregion of the knee during the follow-up period.

The results showed that the top risk factors contributing to rapid cartilage loss were baseline cartilage damage, high BMI, tears or other injury to the meniscus (the cartilage cushion at the knee joint) and severe lesions seen on MRI at the initial exam. Other predictors were synovitis (inflammation of the membrane that lines the joints) and effusion (abnormal build-up of joint fluid).

Excess weight was significantly associated with an increased risk of rapid cartilage loss. For a one-unit increase in BMI, the odds of rapid cartilage loss increased by 11 percent. No other demographic factors--including age, sex and ethnicity--were associated with rapid cartilage loss.

"As obesity is one of the few established risk factors for osteoarthritis, it is not surprisin
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