[Physical activity as medication against arthrosis--training has a positive effect on the cartilage].

It is well known that exercise, alone or combined with weight reduction, reduces pain and improves function in patients with osteoarthritis. The knowledge of the effects of exercise on cartilage is limited and needs to be improved however. It seems as cartilage adapts to loading as other biological tissues like bone and muscle, and moderate loading seems to be beneficial both for prevention and treatment of osteoarthritis.