Osteoporosis is characterized by low bone mass and micro architectural detoriation of bone tissue which leads to bone fragility and tendency to fractures. Osteoarthritis is degenerative disease of synovial joints characterised by focal loss of articular hyaline cartilage with proliferation of new bone and remodeling of joint contour. Even though osteoporosis and osteoarthritis are two different conditions. You can definitely prevent these conditions with common precautions. They both mainly occur due to deficiency in vit D , calcium and also vit C. Having no physical activity. Doing much strenuous exercises. These conditions occur mainly in women and also in old age. Osteoporosis is seen mainly after menopause due to decreased estrogen production. they also occur secondary to diseases like SLE, hyperparathyroidism, thyroid conditions etc. How to prevent osteoporosis and osteoarthritis Diet Calcium rich food Eggs , milk, sesame seeds, tofu, leafy greens, sardines...