The importance of accounting for the area of the medullary cavity in cross-sectional geometry: A test based on the femoral midshaft

American Journal of Physical Anthropology
V S Sparacello, Osbjorn M Pearson

Abstract

In cross-sectional geometric (CSG) studies, both the subperiosteal and endosteal contours are considered important factors in determining bone bending rigidity. Recently, regression equations predicting CSG properties from a section's external dimensions were developed in a world-wide sample of human long bones. The results showed high correlations between some subperiosteally derived and actual CSG parameters. We present a theoretical model that further explores the influence of endosteal dimensions on CSG properties. We compare two hypothetical femoral midshaft samples with the same total subperiosteal area but with percentages of cortical bone at the opposite ends of published human variation for population sample means. Even in this relatively uncommon scenario, the difference between the samples in the resultant means for predicted femoral polar second moment of area (J) appears to be modest: power analysis indicates that a minimum sample size of 61 is needed to detect the difference 90% of the time via a t-test. Moreover, endosteal area can be predicted--although with substantial error--from periosteal area. Despite this error, including this relationship in subperiosteally derived estimates of J produces sample mean esti...Continue Reading

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Citations

Jul 25, 2015·American Journal of Physical Anthropology·Laura A B Wilson, Louise T Humphrey
May 11, 2011·Homo : internationale Zeitschrift für die vergleichende Forschung am Menschen·Christian MeyerKurt W Alt
Sep 29, 2011·American Journal of Physical Anthropology·Efthymia NikitaMarta Mirazón Lahr
Jan 30, 2013·American Journal of Physical Anthropology·Alison A MacintoshJay T Stock
Feb 18, 2011·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Naoki MorimotoChristoph P E Zollikofer
Aug 29, 2014·American Journal of Human Biology : the Official Journal of the Human Biology Council·Thomas G Davies, Jay T Stock
Dec 17, 2014·Journal of Morphology·Sybrand van SittertGraham Mitchell
Feb 14, 2015·American Journal of Physical Anthropology·Alison A MacintoshJay T Stock
Mar 16, 2018·American Journal of Physical Anthropology·Yasuo Hagihara, Takashi Nara
Feb 17, 2019·American Journal of Physical Anthropology·Brigitte Holt, Erin Whittey
Jul 14, 2020·American Journal of Physical Anthropology·Karen R SwanLouise T Humphrey
Aug 24, 2017·American Journal of Physical Anthropology·Yasuo Hagihara, Takashi Nara
Dec 29, 2020·American Journal of Physical Anthropology·Jason A NadellKris Kovarovic

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