Advertisement

What is the ilium bone?

Rick Olderman
Physical Therapy

Ilia (singular, ilium) are two irregularly shaped bones that articulate with the sacrum and house the hip socket where the femur articulates. Other landmarks of the ilium are:

  • Anterior superior iliac spine (ASIS): a landmark to which the tensor fascia lata attaches and below which the rectus femoris and sartorius muscles attach. This is the bony prominence on the upper front of the hip and an important landmark for assessing pelvic rotation.
  • Symphysis pubis: a joint formed by the pubic bones of both ilia. The orientation of the ASIS and symphysis pubis determines whether the pelvis is anteriorly or posteriorly rotated.
  • Iliac crest: the top edge of the ilium. Feeling the iliac crests and comparing them side-to-side helps form a more complete picture of the pelvis's contribution to back pain or hip pain.
  • Ischial tuberosity: the bony part of the ilium on which hamstring muscles originate. This is also commonly referred to as the "sit bone."
  • Coccyx: small, fused vertebrae attached to the sacrum.
Fixing You: Hip & Knee Pain: Self-treatment for IT band friction, arthritis, groin pain, bursitis, knee pain, PFS, AKPS, and other diagnoses

More About this Book

Fixing You: Hip & Knee Pain: Self-treatment for IT band friction, arthritis, groin pain, bursitis, knee pain, PFS, AKPS, and other diagnoses

Hip and knee pain are often a result of poor pelvic muscle performance in combination with poor walking habits. This combination creates tracking problems in the hip socket or excessive rotation at...

Continue Learning about Parts of The Skeletal System

What are the sacrum and coccyx?
Dr. Mehmet Oz, MDDr. Mehmet Oz, MD
The sacrum and coccyx are a group of bones fused together at the base of the spine. Watch to learn m...
More Answers
How is bone formed and broken down?
David Slovik, MDDavid Slovik, MD
Bone is constantly being constructed and demolished. During resorption, cells known as osteoclas...
More Answers
Is the shinbone part of the knee joint?
Dr. Mehmet Oz, MDDr. Mehmet Oz, MD
The end of the tibia, or shinbone, is one of three bones in the knee. The others are the end of the ...
More Answers
What is the scapula?
Rick OldermanRick Olderman
Also known as the shoulder blade, the scapula is a triangular bone that articulates with the arm bon...
More Answers

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.