Innominate bones

The innominate bones, also known as the hip bones or os coxae, are the fused bones of the pelvis either side of the sacrum. The bone comprises the ischium, pubis and ilium which are fused to each other in the acetabulum and are part of the appendicular skeleton

The innominate bone contributes to two bilateral joints and one midline joint:

See bony pelvis.

Anatomy: Lower limb

Anatomy: Lower limb

Anatomy: Abdominopelvic

Anatomy: Abdominopelvic

Article information

rID: 42547
Section: Anatomy
Synonyms or Alternate Spellings:
  • Os coxa
  • hip bones
  • Innominate bone
  • Os coxae

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Cases and figures

  • Figure 1
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  • Figure 2a: muscle attachments (Gray's illustration)
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  • Figure 2b: muscle attachments (Gray's illustration)
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  • Figure 3: ossification centers (Gray's illustration)
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