Patients first need to understand the basic principle of fracture radiograph imaging, because there are differences in the density of different tissues in the human body, so on the radiograph will show different shades of color, generally the tissue containing gas, such as lungs, cavity organs, etc. will show black; soft tissue with moderate density, such as parenchymal organs will show gray; bone tissue, a higher density structure will show white. The definition of fracture is an interruption of the continuity of the bone, and different parts of the fracture are different in the X-ray film. If the fracture occurs in a long bone or a tubular bone, it can be clearly seen that there is a black gap in the middle of the continuous bone cortex, and the displacement can also be clearly reflected. If the fracture occurs in the lumbar spine, which is usually called a compression fracture, the white bone tissue can be seen on the X-ray after compression, and the black surrounding area shows the extent of bone compression.