髋骨为人体腰部的骨骼，共左右两块。幼年时，髋骨分为髂骨, 坐骨和耻骨以及软骨连接。成年后，它们之间的软骨会骨化，成为一个整体，即髋骨。左髋骨、右髋骨、骶骨、尾骨以及它们之间的骨连接一起构成骨盆。髋骨与股骨构成髋关节。

The hip bone (innominate bone, pelvic bone or coxal bone) is a large flat bone, constricted in the center and expanded above and below. In some vertebrates (including humans before puberty) it is composed of three bones: the ilium, ischium, and the pubis.