The highest point of the anterior superior iliac spine in normal adults is generally flat between the fourth and fifth lumbar spinous processes. There are five normal adult lumbar vertebrae, from top to bottom, the first through the fifth lumbar vertebrae in that order. The fourth and fifth lumbar spine interspinous spaces are usually equidistant from the line of the highest point of the iliac spine in the pelvis, and this anatomic landmark is usually used for body surface localization in clinical practice. The line of the highest point of the iliac spine is used to determine the L45 spinous process gap to identify the segment of the lumbar disc herniation and thus to perform a physical examination of the local area. For example, the best site for lumbar disc herniation is the L4/5 disc herniation, and after the L45 disc herniation, there will be significant pressure pain or percussion pain between the L45 spinous processes or next to the spinous processes. In addition, when performing acupuncture and moxibustion treatment, patients can also base their body positioning on the anterior superior iliac spine to help identify the acupuncture points.