Innominate Bone Anatomy: Structure and Landmarks
Anatomy of the Innominate Bone
The innominate bone (commonly known as the hip bone) is a flat bone that falls into the irregular bone category because it features spines, ridges, recesses, cavities, and holes. It consists of three primitive bones:
- Ilium
- Ischium
- Pubis
The Posterior Border and Iliac Crest
Taking the area located behind the ischial tuberosity and down the bone as a starting point, we continue upward to find the lesser sciatic notch, which ends in a sharp projection: the ischial spine. This spine marks the beginning of the greater sciatic notch, which is completed by another acute ledge: the posterior inferior iliac spine. These two projections are located in the ilioischial area.
Following upward, there is a small depression called the...