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Auteur (up) Bonneau, N.; Simonis, C.; Seringe, R.; Tardieu, C. openurl 
  Titre Study of Femoral Torsion During Prenatal Growth: Interpretations Associated With the Effects of Intrauterine Pressure Type Article scientifique
  Année 2011 Publication American Journal Of Physical Anthropology Revue Abrégée  
  Volume 145 Numéro 3 Pages 438-445  
  Mots-Clés  
  Résumé The developing fetus is protected from external environmental influences by maternal tissues. However, these structures have a limited elasticity, such that the fetus must grow in a confined space, constraining its size at the end of pregnancy. Can these constraints modify the morphology of the fetal skeleton? The intensity of these constraints increases between 5 months and birth, making it the most appropriate period to address this question. A sample of 89 fetal femora was analyzed, and results provide evidence that during this period, the torsion of the femoral shaft (quantified by means of a new three-dimensional method) increases gradually. Two explanations were considered: this increase could signal effects of constraints induced by the intrauterine cavity, developmental patterning, or some combination of these two. Different arguments tend to support the biomechanical explanation, rather than a programming pattern formation. Indeed, the identification of the femur as a first degree lever, created by the hyperflexion of the fetal lower limbs on the pelvis, could explain the increase in femoral shaft torsion during prenatal life. A comparison with femora of infants is in accordance with this mechanical interpretation, which is possible through bone modeling/remodeling. Although genetic and epigenetic mechanisms may regulate timing of fetal development, our data suggest that at birth, the fetal skeleton also has an intrauterine mechanical history through adaptive bone plasticity. Am J Phys Anthropol 145: 438-445, 2011. (C) 2011 Wiley-Liss, Inc.  
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  ISSN 0002-9483 ISBN Médium  
  Région Expédition Conférence  
  Notes WOS:000291949700010 Approuvé pas de  
  Numéro d'Appel MNHN @ hackert @ collection 585  
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