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Faculté des Sciences appliquées
Faculté des Sciences appliquées
MASTER THESIS
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Relationship between Microstructure and Mechanical Properties of Proximal Tibia in Rats during Aging

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Maroquin, Juliette ULiège
Promotor(s) : Ruffoni, Davide ULiège
Date of defense : 4-Sep-2023/5-Sep-2023 • Permalink : http://hdl.handle.net/2268.2/18329
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Title : Relationship between Microstructure and Mechanical Properties of Proximal Tibia in Rats during Aging
Translated title : [fr] Relation entre la Microstructure et les Propriétés Mécaniques du Tibia Proximal chez le Rat au cours du Vieillissement
Author : Maroquin, Juliette ULiège
Date of defense  : 4-Sep-2023/5-Sep-2023
Advisor(s) : Ruffoni, Davide ULiège
Committee's member(s) : Geris, Liesbet ULiège
Van Lenthe, Harry 
Ruffoni, Davide ULiège
Delaunois, Yann ULiège
Language : English
Number of pages : 73
Discipline(s) : Engineering, computing & technology > Multidisciplinary, general & others
Institution(s) : Université de Liège, Liège, Belgique
Degree: Master en ingénieur civil biomédical, à finalité spécialisée
Faculty: Master thesis of the Faculté des Sciences appliquées

Abstract

[en] The proximal tibia, an integral part of the knee joint, undergoes complex structural and mechanical changes as individuals get older. This multifaceted region encompasses layers like cartilage, the epiphysis, the growth plate, and the metaphysis. These changes are often attributed to osteoarthritis (OA), a common joint disorder affecting the elderly. However, the mechanisms behind OA remain poorly understood. Consequently, a complete examination of each layer of the joint and their interactions is essential for a global understanding of the ageing process and the impact of osteoarthritis.
This thesis explores microarchitectural and mechanical changes in the trabecular metaphysis due to ageing, using extensive 3D morphometric analyses and finite element modelling. The study also investigates age-related structural changes in the growth plate region. Micro-computed tomography images of rat proximal tibias were used.
The trabecular metaphyseal architecture was meticulously characterized. The global morphometric parameter analysis and spatially resolved assessments uncover structural variations within the bone itself and between young and aged samples. The finite element model reveals the elastic behaviour of the region along different directions. Age-related structural changes within the growth plate are also identified through global 3D analysis, including thickness distribution.
The variations observed in the architectural features between the lateral and medial metaphyseal
regions, as well as the variations along the longitudinal axis, highlight the significant heterogeneity of trabecular bone in this area. This variability underscores the complex bone response to mechanical loads. With age, structural changes increase bone heterogeneity, impacting mechanical behaviour and load-bearing capacity. The coherence between results from structural and finite element analyses emphasis the robust relationship between microarchitecture and mechanical properties. The growth plate also undergoes distinct changes with age, notably densification, involving a loss of structural integrity.
This study provides valuable insights into the intricate connection between microstructural variations and mechanical properties within the metaphyseal trabecular bone and growth plate. It highlights the complex adaptation of bone to mechanical demands and emphasises the role of microstructural changes in shaping mechanical behaviour. These findings contribute to our understanding of age-related changes of bone microstructure.


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Author

  • Maroquin, Juliette ULiège Université de Liège > Master ing. civ. biomed., à fin.

Promotor(s)

Committee's member(s)

  • Geris, Liesbet ULiège Université de Liège - ULiège > Département d'aérospatiale et mécanique > Génie biomécanique
    ORBi View his publications on ORBi
  • Van Lenthe, Harry KU Leuven > Department of Mechanical Engineering > Biomechanics Section
  • Ruffoni, Davide ULiège Université de Liège - ULiège > Département d'aérospatiale et mécanique > Mécanique des matériaux biologiques et bioinspirés
    ORBi View his publications on ORBi
  • Delaunois, Yann ULiège Université de Liège - ULiège > FOCUS
    ORBi View his publications on ORBi
  • Total number of views 62
  • Total number of downloads 3










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