Subpubic curvature has two meanings, one is the physical anatomical definition of suprapubic and the other refers to one of the curves of the male urethra. 1. pubic bone on the pubic bone: means the curvature formed between the pubic tubercle and the inferior branch of the pubic bone of the human body, called the pubic bone under the bend. The pubic tubercle is a distinct bony landmark palpable at the very bottom of the human abdomen, in the middle of both thighs. 2. The pubic symphysis on the urethra: it means that the male urethra has two bends, respectively, for the pubic symphysis, pubic symphysis anterior bend, the approximate location were in the lower part of the pubic bone and the front part of the pubic bone. The pubic bone is generally below the pubic symphysis about 2cm position, is protruding to the rear, relatively narrow and easy to block, at the same time pelvic fracture is also easy to damage here.