Why do obese people have a higher incidence of osteoarthritis compared to the non-obese population?
The thought has been that the increased weight causes mechanical “wear and tear” on the articular cartilage, leading to arthritis. Research is now suggesting different reasons. An outstanding review article was published in the March, 2013 edition of the American Journal of Orthopaedic Surgeons, authored by Dr. Ryan Koonce and Dr. Jonathan Bravman discuss the scientific link between obesity and osteoarthritis including knee osteoarthritis.
The definition of obesity is based in body mass index (BMI) not total body weight. BMI is calculated by taking the weight of the person in kilograms divide by their height in meters squared. Obesity is defined as a BMI of greater than 30 whereas over weight is defined as a BMI between 25 and 29. In the US 68% of the population is overweight and 34% are obese. These numbers have double in the last twenty years. Obesity is associated with a variety of medical conditions such as coronary artery disease, diabetes, asthma and some types of cancer. (more…)
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