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Differences in Mechanical Properties of the Human and Monkey TibiaA method which uses an instrument that detects the response of a long bone to a vibratory stimulus to quantify mechanical properties non-invasively was revised and validated for use in the tibia. Stored data from healthy men was reanalyzed and compared with values from non-human primates. The analysis uses the relationship K(sub b) = 48 EI/L(sup 3) where K(sub b) is the lateral stiffness of a beam with force applied midspan, E is the elastic modulus, I the geometric moment of inertia and L, the limb length. Values for stiffness (EI, Nm(sup2)), the Euler buckling load (P(sub cr) = EI (pi/L)(sup 2)), and bone sufficiency (S) which represents the axial load the bone can support, adjusted to BW (S=P(sub cr)/BW) were obtained. The interest precision of the method in relaxed men, 5.8%, and in sedated male monkeys, 4.3%, was based on repeated measures in the same subjects at 1 month intervals. The R tibias of 40 men, aged 38.6 +/- 7.3 yrs with BW 78.9 +/- 7.9 kg, showed average (+/- SD) L to be 35 +/- 2 cm, EI 222 +/- 71 Nm(sup 2), P(sub cr) 18.1 +/- 4.9 kN, and S 23.4 +/- 5.7 N. The R tibias of 24 Rhesus monkeys ranging in age from 2-12 years, BW 4.9 +/- 3 kg, showed L to be 14.7 +/- 1.9 cm, EI 6.0 +/- 4.8 Nm(sup 2), P(sub cr) 2.51 +/- 1.2 kN and S 57.3 N. These measurements indicate that the tibia of a terrestrial non-human primate, M. mulatta, has higher load carrying capacity for the level of body weights in the species than the human bone.
Document ID
20020038810
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Arnaud, Sara B.
(NASA Ames Research Center Moffett Field, CA United States)
Hutchinson, T. M.
Bakulin, A. V.
Rahkmanov, A. S.
Steele, C. R.
Hargens, Alan R.
Date Acquired
August 20, 2013
Publication Date
January 1, 1996
Subject Category
Aerospace Medicine
Meeting Information
Meeting: 18th Annual American Society for Bone and Mineral Research
Location: Seattle, WA
Country: United States
Start Date: September 7, 1996
End Date: September 11, 1996
Sponsors: American Society for Bone and mineral Research
Funding Number(s)
PROJECT: RTOP 199-26-12-02
PROJECT: RTOP 199-26-12-34
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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