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Ossification centres of the hip

Listed below are the ossification centres related to the hip joint:

Pelvic

  • ilium - 8 week in utero
  • ischium - 4-6 months in utero
  • pubis - 4-6 months in utero
  • acetabulum (two centres) - puberty

The ilium, ischium and pubis all fuse at 7-9 years. Acetabulum fusion (i.e. replacement of triradiate cartilage) occurs at 20-25 years. 

Proximal femur

  • shaft - 7 weeks in utero
  • femoral capital epiphyses - 2-4 months in utero
  • femoral head - 4-6 months
  • greater trochanter - 2-4 years
  • lesser trochanter - puberty

All of femoral ossification centres fuse between the ages of 14 and 18. 


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Lower limb anatomy

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