A nurse is assisting with a presentation at a community center about knee disorders and injuries. The nurse should include which of the following as risk factors for developing osteoarthritis? (Select all that apply.)

A. Aging is a major risk factor because cartilage naturally wears down over time. B. Obesity increases mechanical stress on weight-bearing joints, accelerating cartilage breakdown. C. Regular, strenuous exercise does not directly cause osteoarthritis; moderate exercise actually helps protect joints. D. A family history of osteoarthritis increases genetic susceptibility to the disease. E. Calcium deficiency is associated with osteoporosis, not osteoarthritis.