Bones play an important physiological function in the body, such as supporting the body, protecting internal organs, producing blood and body movement, etc. Bones protect internal organs, such as the skull to protect the brain, the ribs to protect the thorax, the spine to protect the spinal cord, and so on. The skeleton constitutes the entire skeleton of the human body and maintains the body’s posture, while the bones, skeletal muscles, tendons, ligaments and joints together generate and transmit force to move the body, playing an important role in the support and movement of the human body. At the same time, there is a large amount of red bone marrow in the epiphysis of the long bones and the bone marrow cavity of the flat bones, which can produce blood cells such as red blood cells, platelets, white blood cells and so on. In addition, the bones store important minerals, such as calcium and phosphorus. Bones play a strong supporting role in the body. When the body remains stationary, such as standing or sitting, the bones remain relatively stationary between them, supporting the body and maintaining a certain posture. When the body begins to move, it is not the bones in motion, but the muscle contraction between the two bones, the bones can be compared to a lever, the muscle for the lever side of the force point, the joint between the bones can be seen as the fulcrum of the lever, the bones around the fulcrum (joint) in the activity. Of course, in fact, in addition to the activities of the skeleton around the fulcrum to do lever movement, but also the existence of rotational movement, further increasing the range of motion of the body.