For a normal and healthy adult, the weight of bones is related to body weight, with the weight of bones accounting for about 15-20% of body weight, but changes in the proportion of the relationship can occur due to orthopedic diseases or abnormalities in bone metabolism. Changes in body weight due to other diseases, such as obesity, overweight or excessive wasting due to excessive malnutrition in the body, can change the ratio of bone to body weight. Commonly, such as osteoporosis, bone mass can cause loss, and thus the ratio is not so accurate, and also, for example, excessive overweight, obesity, and very high fat content in the body, thus changing the proportion of bone weight and body weight. Therefore, for normal and healthy adults, there is a correlation between bone mass and weight, and as weight increases, so does bone weight, but for adolescent children or the elderly, and for patients who are overweight or underweight, or have other diseases, the relationship between bone weight and weight is not so exact.