The lumbosacral angle is located between the lumbar vertebrae and the sacral vertebrae, and can be easily localized in the following way: the patient can find any one of the spinous processes of the lumbar vertebrae in the middle of the back of the waist, and then touch the lumbar spinous processes along the posterior midline of the human body, and then touch the 5th lumbar vertebrae, that is, the lowest lumbar vertebrae, which is intersected with the sacral vertebrae, and then touch the obvious depression, and this is the lumbosacral angle. On the posterior side of the body, due to the presence of the lumbosacral angle, this area is often palpated, and a distinct depression can be felt. The lumbosacral angle is actually measured accurately on lateral plain films of the lumbar spine, and can sometimes be seen by others from the rear when the patient is standing. The lumbosacral angle is very pronounced in special populations, such as adult females or patients with lumbar spondylolisthesis, where the angle may become larger and can be clearly observed on the surface of the body during the physical, or preliminary, examination of the patient.