Regular sports activity is not only healthy for cardiovascular and psychological reasons, but it is neither a risk factor for increased risk for osteoarthritis, except for posttraumatic osteoarthritis due to sports injuries. But there are few hints that excessice sports activity may lead to increased risk for osteoarthritis. Therefore, adapted and moderate sports activity can be recommended and should be promoted for osteoar­thritis or after total joint replacement of the lower extremity. This leads to increased functional and subjective outcome.