Sex variation at the time of sonographic appearance of the proximal tibial epiphyseal ossification center.
The time of sonographic appearance of the proximal tibial epiphyseal ossification center and its sexual variation was assessed in 659 normal pregnancies. Proximal tibial center appears between 34-37 weeks gestation. In female fetuses, it appears between 34-35 weeks and in males, between 35-36 weeks (P < 0.001). There was a tendency of female proximal tibial center appearance to precede male appearance, by approximately one week. This difference, however, didn't show statistical significance.
Nazário
A C
AC
Clinica Paulista de Assistência à Mulher (CLIPAM, São Paulo Clinic for Women's Care), Brazil.
Tanaka
C I
CI
Santana
R M
RM
Juliano
Y
Y
D005314:Embryonic and Fetal Development; D004838:Epiphyses / Q000000981:diagnostic imaging / Q000196:embryology*; D005260:Female; D005865:Gestational Age; D006801:Humans; D008297:Male; D011247:Pregnancy; D012727:Sex Characteristics; D013977:Tibia / Q000000981:diagnostic imaging / Q000196:embryology*; D014463:Ultrasonography