Distal Femoral Epiphyses Ossification Center Diameter and Third Trimester Gestational Age in Iranian Population

Shirin Birang; Ali Akbar Ameri; Zahra Najmi

doi:10.17772/gp/1674

Vol 84, No 12 (2013)

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Distal Femoral Epiphyses Ossification Center Diameter and Third Trimester Gestational Age in Iranian Population

Shirin Birang, Ali Akbar Ameri, Zahra Najmi

DOI: 10.17772/gp/1674

Ginekol Pol 2013;84(12).

Vol 84, No 12 (2013)

ARTICLES

Abstract

Objective: The epiphyses ossification centers appear late in gestation, when traditional biometric measurements are the least accurate, and they can be useful in determining third trimester’s gestational age. To evaluate fetal distal femoral epiphysis (DFE) size in various ages of gestation and establish a reference chart for Iranian population. Materials & Methods: DFE diameter was measured in 1300 normal singleton pregnancies, between 28 and 40 weeks. Mean diameter in each week of gestation was evaluated. Results: The DFE is not visualized in 28 weeks’ gestation. It appeared in a small proportion of the fetuses (5%) as early as the 29th week. DFE was detectable by ultrasonography increased dramatically to 56% at 33 weeks’ reaching 94% at 36 weeks and 100% at 37 weeks gestation. Conclusion: Ultrasonographic visualization of the distal femoral epiphyses ossification center is a useful marker of fetal third trimester’s gestational age.