Postnatal ontogeny of tibia and femur form in two human populations: A multivariate morphometric analysis
Article first published online: 29 SEP 2011
Copyright © 2011 Wiley-Liss, Inc.
American Journal of Human Biology
Volume 23, Issue 6, pages 796–804, November/December 2011
How to Cite
Frelat, M. A. and Mittereocker, P. (2011), Postnatal ontogeny of tibia and femur form in two human populations: A multivariate morphometric analysis. Am. J. Hum. Biol., 23: 796–804. doi: 10.1002/ajhb.21217
- Issue published online: 10 OCT 2011
- Article first published online: 29 SEP 2011
- Manuscript Accepted: 20 AUG 2011
- Manuscript Received: 19 JUL 2011
- French National Museum of Natural History (Leg Prévost) and French Ministry of for Research and New Technologies (Aires culturelles)
Adult population differences in relative and absolute limb size often are explained as adaptations to different climates. Less is known about other aspects of limb bone form and their population-specific growth patterns.
We study postnatal ontogenetic development of tibial and femoral form by a multivariate morphometric approach in a cross-sectional sample of South African (N = 97) and European (N = 81) modern humans from 0 to 20 years of age. Because the epiphyses ossify and fuse to the diaphysis in this time period, we separately analyze two sets of variables. Average ontogenetic trajectories are computed to compare the growth patterns of the African and the European groups.
For both the tibia and the femur, we could show that Africans and Europeans have a very similar average length and average shape until about 10 years of age. During adolescence Africans have a higher growth rate leading to longer adult bones with narrower epiphyses relative to the diaphysis. Despite substantial individual overlap, the average crural index is higher in Africans than in Europeans, from birth on through adulthood.
The prenatal origin of population differences in the crural index indicates a genetic determination of these differences whereas limb length and relative epiphyseal width likely are both genetically and environmentally determined. Am. J. Hum. Biol. 2011. © 2011 Wiley-Liss, Inc.