Contents

Name of bone

Ischium

Location/Articulation

The ischium forms the lower and back part of the hip bone (os coxae). Situated below the ilium and behind the pubis, the ischium is one of three bones whose fusion creates the coxa.

The word “ischium” comes from the Greek ischion, meaning “hip.” (Taber’s, 1985).

Muscle and ligament attachments

Surface anatomy

The strongest of the coxal bones, the ischium is comprised of three parts:

  • Body of ischium – the portion that supports weight while sitting (especially noticeable on a hard surface)
  • Superior ramus of the ischium
  • Inferior ramus of the ischium


Figure 1. Anatomy of the pelvic bones

Radiography

Physical examination

Embryology

Anomalies

Injuries/Disorders

Clinically, avulsion fracture of the ischial apophysis may occur.

Attachments:


ischium.jpg (image/pjpeg)