Attached is a pdf file delineating the embryonic development of the foot during the first trimester of gestation.
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- At Carnegie Stage 14 the lower limb appears
- At Carnegie Stage 17 the soles of the foot bud are cephalad
- At Carnegie Stage 18 the feet have rotated into supinatus (soles facing each other)
- At Carnegie Stage 23 the ankles and toes are fully visible.
As a result of my clinical research, I contend that:
- At week 10pf, the feet have a clubfoot shape
- At week 11pf, the feet have a preclinical shape
- At week 12pf, the feet have primus metatarsus supinatus shape
- At week 13pf, the feet have a plantargrade shape
- If the ontogenetic development of the foot stops prematurely at week 10 pf, the neonatal is born with a Clubfoot deformity
- If the ontogenetic development of the foot stops prematurely at week 11pf, the neonatal is born with a Preclinical Clubfoot deformity
- If the ontogenetic development of the foot stops prematurely at week 12 pf, the neonatal is born with a Rothbarts foot
- If the ontogenetic development continues through week 13pf, the neonatal is born with a Plantargrade foot.
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