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Analysis of the human tibia structure by tomographic (pQCT) serial scans

Capozza, Ricardo und Feldman, Sara und Mortarino, Pablo und Reina, Paola Soledad und Rittweger, Jörn und Ferretti, José Luis und Cointry, Gustavo (2010) Analysis of the human tibia structure by tomographic (pQCT) serial scans. Journal of Anatomy, 20, Seiten 1-12.

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Kurzfassung

This study analyses the evaluation of tomographic indicators of tibia structure, assuming that the usual loading pattern shifts from uniaxial compression close to the heel to a combined compression, torsion and bending scheme towards the knee. To this end, pQCT scans were obtained at 5% intervals of the tibia length (S5–S95 sites from heel to knee) in healthy men and women (10 ⁄ 10) aged 20–40 years. Indicators of bone mass [cortical area, cortical ⁄ total bone mineral content (BMC)], diaphyseal design (peri ⁄ endosteal perimeters, cortical thickness, circularity, bending ⁄ torsion moments of inertia – CSMIs), and material quality [(cortical vBMD (bone mineral density)] were determined. The longitudinal patterns of variation of these measures were similar between genders, but male values were always higher except for cortical vBMD. Expression of BMC data as percentages of the minimal values obtained along the bone eliminated those differences. The correlative variations in cortical area, BMC and thickness, periosteal perimeter and CSMIs along the bone showed that cortical bone mass was predominantly associated with cortical thickness toward the mid-diaphysis, and with bone diameter and CSMIs moving more proximally. Positive relationships between CSMIs (y) and total BMC (x) showed men’s values shifting to the upper-right region of the graph and women’s values shifting to the lower-left region. Total BMC decayed about 33% from S5 to S15 (where minimum total BMC and CSMI values and variances and maximum circularity were observed) and increased until S45, reaching the original S5 value at S40. The observed gender-related differences reflected the natural allometric relationships. However, the data also suggested that men distribute their available cortical mass more efficiently than women. The minimum amount and variance of mass indicators and CSMIs, and the largest circularity observed at S15 reflected the assumed adaptation to compression pattern at that level. The increase in CSMIs (successively for torsion, A–P bending, and lateral bending), the decrease in circularity values and the changes in cortical thickness and periosteal perimeter toward the knee described the progressive adaptation to increasing torsion and bending stresses. In agreement with the biomechanical background, the described relationships: (i) identify the sites at which some changes in tibial stresses and diaphyseal structure take place, possibly associated with fracture incidence; (ii) allow prediction of mass indicators at any site from single determinations; (iii) establish the proportionality between the total bone mass at regions with highly predominant trabecular and cortical bone of the same individual, suitable for a specific evaluation of changes in trabecular mass; and (iv) evaluate the ability of bone tissue to self-distribute the available cortical bone according to specific stress patterns, avoiding many anthropometric and gender-derived influences.

Dokumentart:Zeitschriftenbeitrag
Titel:Analysis of the human tibia structure by tomographic (pQCT) serial scans
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Capozza, Ricardorcapozza@gmail.com
Feldman, SaraNational University of Rosario
Mortarino, PabloNational University of Rosario
Reina, Paola SoledadNational University of Rosario
Rittweger, Jörnjoern.rittweger@dlr.de
Ferretti, José Luisjlferretti@arnet.com.ar
Cointry, GustavoNational University of Rosario
Datum:2010
Erschienen in:Journal of Anatomy
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:20
Seitenbereich:Seiten 1-12
Status:veröffentlicht
Stichwörter:bone biomechanics; bone structure; human tibia; peripheral quantitative computed tomography; tibia anatomy; tibia biomechanics; tibia structure
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W FR - Forschung unter Weltraumbedingungen (alt)
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W FR - Forschung unter Weltraumbedingungen
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Integrative Studien (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Luft- und Raumfahrtmedizin > Weltraumphysiologie
Hinterlegt von: Jörn Rittweger
Hinterlegt am:22 Jan 2010 13:30
Letzte Änderung:26 Mär 2013 13:15

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