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Structural differences in cortical shell properties between upper and lower fibula as described by pQCT serial scans. A biomechanical interpretation

Cointry, G. and Nocciolino, L.M. and Ireland, A. and Hall, N. and Kriechbaumer, Andreas and Ferretti, J.L. and Rittweger, J. and Capozza, R.F. (2016) Structural differences in cortical shell properties between upper and lower fibula as described by pQCT serial scans. A biomechanical interpretation. Bone, 90, pp. 185-194. Elsevier. doi: 10.1016/j.bone.2016.06.007. ISSN 8756-3282.

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This study describes the structural features of fibula cortical shell as allowed by serial pQCT scans in 10/10 healthy men and women aged 20-40years. Indicators of cortical mass (mineral content -BMC-, cross-sectional area -CSA-), mineralization (volumetric BMD, vBMD), design (perimeters, thickness, moments of inertia -MIs-) and strength (Bone Strength Indices, BSIs; polar Strength-Strain Index, pSSI) were determined. All cross-sectional shapes and geometrical or strength indicators suggested a sequence of five different regions along the bone, which would be successively adapted to 1. transmit loads from the articular surface to the cortical shell (near the proximal tibia-fibular joint), 2. favor lateral bending (central part of upper half), 3. resist lateral bending (mid-diaphysis), 4. favor lateral bending again (central part of the lower half), and 5. resist bending/torsion (distal end). Cortical BMC and the cortical/total CSA ratio were higher at the midshaft than at both bone ends (p<0.001). However, all MIs, BSIs and pSSI values and the endocortical perimeter/cortical CSA ratio (indicator of the mechanostat's ability to re-distribute the available cortical mass) showed a "W-shaped" distribution along the bone, with maximums at the mid-shaft and at both bone's ends (site effect, p<0.001). The correlation coefficient (r) of the relationship between MIs (y) and cortical vBMD (x) at each bone site ("distribution/quality" curve that describes the efficiency of distribution of the cortical tissue as a function of the local tissue stiffness) was higher at proximal than distal bone regions (p<0.001). The results from the study suggest that human fibula is primarily adapted to resist bending and torsion rather than compression stresses, and that fibula's bending strength is lower at the center of its proximal and distal halves and higher at the mid-shaft and at both bone's ends. This would favor, proximally, the elastic absorption of energy by the attached muscles that rotate or evert the foot, and distally, the widening of the heel joint and the resistance to excessive lateral bending. Results also suggest that biomechanical control of structural stiffness differs between proximal and distal fibula.

Item URL in elib:https://elib.dlr.de/107466/
Document Type:Article
Title:Structural differences in cortical shell properties between upper and lower fibula as described by pQCT serial scans. A biomechanical interpretation
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Cointry, G.National University of RosarioUNSPECIFIED
Ireland, A.Manchester Metropolitan UniversityUNSPECIFIED
Hall, N.Division of Space Physiology, Institute of Aerospace Medicine, German Aerospace Center, Cologne, GermanyUNSPECIFIED
Kriechbaumer, AndreasAndreas.Kriechbaumer (at) dlr.dehttps://orcid.org/0000-0001-7481-6000
Ferretti, J.L.jlferretti (at) arnet.com.arUNSPECIFIED
Rittweger, J.Institute of Aerospace Medicine, Deutsches Zentrum für Luft- und Raumfahrt, DLR e.V., Cologne, Germany and Medical Faculty, University of Cologne, Cologne, Germany; joern.rittweger (at) dlr.deUNSPECIFIED
Date:September 2016
Journal or Publication Title:Bone
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.bone.2016.06.007
Page Range:pp. 185-194
Keywords:Bone adaptation; Bone architecture; Bone biomechanics; Bone mechanostat; Bone structure; Fibula
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Research under Space Conditions
DLR - Research theme (Project):R - Vorhaben Integrative Studien (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Space Physiology
Deposited By: Becker, Christine
Deposited On:09 Nov 2016 10:59
Last Modified:01 Dec 2018 19:52

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