Evidence on the relationship between physical activity and knee OA in older people is mixed, with some studies showing exercise boosts risk, others showing a protective effect, and still others finding no relationship
According to Arthritis & Rheumatism, February 2009,more activities producing high mechanical strain, such as tennis and dancing, were at greater risk of knee OA,and using measured muscle weakness or functional limitations showing that reduced muscle strength might increase the risk of OA as some mechanical loading of the bone is necessary to maintain healthy bone and cartilage structures."
so,you have to keep balance.
Source:Arthritis & Rheumatism, February 2009
