Bone is a unique organ of vertebrates, we humans are higher vertebrates, the bones of the whole body is the pillar of the perfect human movement system, playing the role of movement, support and protection of the body, without bones, we would be a pile of “meat mush”, bones also have the role of blood production, storage of minerals. Human bones are composed of water, organic matter and inorganic matter, and the different proportions of organic matter and inorganic matter also lead to different soft and hard bones, fetal bones are initially all cartilage, children’s bones contain more organic matter, so the bones are softer and less likely to fracture, as we grow older, the proportion of inorganic content in the bones is higher and higher, the bones are harder and more brittle, so the elderly are more likely to fracture. The inside of the bone is a hard honeycomb-like three-dimensional structure – not solid – so that the body can reduce the weight and burden. There are 206 bones of all sizes in the adult body, but most Chinese people have only 204 bones because the toe bone of the Chinese little toe has only 2 sections, so Chinese people have 2 less bones than European and American people. Bones can be divided by shape into long bones (such as the humerus and femur of the limbs), short bones (such as the wrist bone), flat bones (such as the scapula), irregular bones (such as the vertebrae), round bones (the patella on the knee), and by location into 23 skull bones, 51 trunk bones, 126 limb bones (124 for Chinese), and a special 6 hear small bones. The largest bone in the human body is the femur, or thigh bone, which can withstand the pressure of several hundred kilograms. The smallest bone is in the eye of the ear, which is smaller than a green bean and is an important pathway for the transmission of sound waves. The shape of each bone in each person is generally similar, but the size of each bone varies greatly, which also determines the difference between each person’s height, fat and thin, for example, Yao Ming’s leg bones are longer than the average person to a large cut. For example, Yao Ming’s leg bones are much longer than the average person. Therefore, archaeologists can speculate the height and even the appearance of the person in life based on some of the bones of the ancient people unearthed. Regarding bones, the most common disease is of course fractures, which not only cause pain and bleeding, but also weaken or even disappear the most important function of support and movement, just like a broken tree trunk. Orthopedic surgeons have to reposition and prop up the broken bones in various ways, the most effective way is to do surgery, which is not easy because every fracture is different, and the surgeon has to reset the broken vase like an artist and try to restore it to its original shape, and some simple fractures can also be fixed by plaster to achieve rehabilitation. Other diseases of the skeletal system include inflammation, tumors, deformities, soft tissue injuries, joint injuries, osteoporosis, etc. Orthopedic surgeons do not just look at bone diseases, but also the bones, nerves, blood vessels, muscles, soft tissues, etc. Together they form our motor system, and the diseases of the motor system are generally seen by orthopedic surgeons. For example, if you accidentally sprain your ankle, some people think it’s okay if you take a film and find no fracture, but in fact it’s likely to have a ligament laceration, and the harm caused by untimely treatment is not much better than a fracture.