How to locate the posterior superior iliac spine by hand

In the supine position, draw a horizontal line through the umbilicus to intersect with the midline, and draw a bisector with the umbilicus as the starting point to the lower side. On this bisector, move 4 horizontal fingers to the lower side for two consecutive times, and finally touch the pulp of the thumb. The hard part is the anterior superior iliac spine. This method is often used in obese people whose anterior superior iliac spine is not obvious. Clinically, bone marrow puncture is often performed at the flat part of the bony surface of the iliac tubercle of the three transverse fingers. Paracentesis is often performed at the middle and outer 1/3 of the line connecting the umbilicus and the left anterior superior iliac spine. The line connecting the highest points of the iliac crests on both sides is often in the interspinous space between l3 and l4, and intraspinal anesthesia can be performed clinically.

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