Osteoporosis is caused by two types of reasons, one is primary disease, and the other is secondary disease. Primary disease is commonly seen in postmenopausal women, as well as in some chronic strain injuries, and the occurrence of some metabolic diseases, which accounts for primary osteoporosis. Secondary osteoporosis may be due to trauma, long-term plaster immobilization, or lack of weight bearing after surgical fixation, leading to disuse osteoporosis.