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Os Coxa
Primary:
  • Iliac Ala - 9th fetal wk
  • Ishial body - 4th fetal mo
  • Sup. pubic ramus - 4th fetal mo
Secondary: appear @ puberty, fuse 15-25
  • Iliac crest
  • pubic body
  • ishial tuberosity
  • acetabulum
femur
Primary: midshaft @ 7th fetal wk

Secondary: fuse in reverse order age 16-20
  • condyles: @ birth
  • head: 1 yr
  • greater trochanter: 4-5 yrs
  • lesser trochanter: 12-14 yrs
patella
appear @ 3-6 yrs
fuse @ puberty
tibia
primary: 7th fetal wk (shaft)

secondary:
  • proximal: @ birth
  • distal: 1 yr
  • fuse @ 15-18 in reverse order
fibula
primary: 8th fetal wk (shaft)

secondary:
  • proximal: 1 yr
  • distal: 3 yrs
  • fuse in same order @ 15-19 yrs
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