Anatomy study note · Pelvis

Hip bone

The large irregular bone forming the side and front of the pelvis. In children it is three bones, ilium, ischium and pubis, joined by a triradiate cartilage in the acetabulum; they fuse at puberty.

Key points

• Ilium + ischium + pubis, fused at the acetabulum (triradiate cartilage).
• Pelvic inlet: promontory, iliopectineal lines, symphysis.
• Pelvic outlet: coccyx, ischial tuberosities, pubic arch (+ sacrotuberous ligaments).
• Ring fracture: 1 break stable, 2 breaks unstable.
• Female: oval inlet, wide subpubic angle, everted spines.
• Limb bones: limb-bud mesenchyme, endochondral (except clavicle).
• Bone: type I collagen + hydroxyapatite.
• Osteoblast builds, osteocyte maintains, osteoclast resorbs.

The full note in the atlas also covers

Features · Articulations · Histology · Development · Clinical notes

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Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 8, PDF pp. 1011–1014, 1021–1022, 1030–1032, 1039–1041
• Inderbir Singh’s Human Embryology, ch. 7, PDF p. 98; ch. 10, PDF pp. 141, 145
• BRS Cell Biology & Histology, 7th ed., ch. 7, PDF pp. 121–125, 130

More from the pelvis

• Internal iliac artery
• Internal iliac vein
• Levator ani
• Ligaments of the uterus
• Obturator internus
• Obturator membrane
• Obturator nerve
• Ovary
• Pelvic lymph nodes
• Piriformis
• Prostate
• Pubic symphysis

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