"You are going to wear out your knees running." Every runner has heard this, usually from non-runners. However, this statement is based on very little scientific evidence.
Theoretically, one might expect that repetitive loading of joints over years of running might lead to arthritis. In fact, there is laboratory data that shows that acute and repetitive joint loading may cause changes in articular cartilage (joint cartilage) that are associated with arthritis. Many investigators have tried to look at this clinically. While there are a very few number of small, poorly conducted studies that suggest a link between running and arthritis, the overwhelming majority of studies find no link between running and arthritis in otherwise healthy people.
Human joints have the intrinsic ability to adapt to stress and strengthen in the process. Moderate running provides this stress, and may lead to improved joint health and longevity. That being said, running isn't for everybody. There are certain independent risk factors for the development of arthritis. These include age, obesity, mal-alignment, and history of trauma or injury. Running may potentially exacerbate the risks in the presence of these other factors. Before beginning a running program, it's a good idea to consult with your doctor.
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