Bone scaling line means epiphysis, which is the same thing. The line of bone scale, also called the epiphysis, is a disc-shaped cartilaginous structure called the epiphysis at the ends of the long bones of the human limbs, at the edges of the diaphysis, and in the flattened bones of the joints. There is a residual gap between the epiphyseal shaft and the epiphysis, called the epiphysis. Epiphyseal cartilage is a special type of ossifiable cartilage, and the development and growth of long bones depend on the division, proliferation, and ossification of the epiphysis. With age, the development of the epiphysis will stop proliferating and eventually ossify, the epiphyseal cartilage will disappear, the long bones of the limbs will slowly stop developing, at this time the epiphyseal line will slowly become narrower, and after adulthood the diaphysis and epiphysis will be completely fused and the epiphysis will be closed, the growth and development of the bones basically stops.