Long Ting, Besier Thor F, Fernandez Justin, Yeung Ted
Auckland Bioengineering Institute, University of Auckland, New Zealand.
Auckland Bioengineering Institute, University of Auckland, New Zealand; Department of Engineering Science & Biomedical Engineering, University of Auckland, New Zealand.
J Biomech. 2025 Jan;179:112486. doi: 10.1016/j.jbiomech.2024.112486. Epub 2024 Dec 16.
Morphology and cortical thickness of tibia bone influence the strength and strain distribution of bone and also influence fatigue fracture risk. However, current studies have not extensively explored the effect of morphology and cortical thickness on tibial strain distribution during different activities. This study aims to assess the effect of tibial morphology and cortical thickness on tibial strain during six different sports movements. The tibial surfaces were reconstructed from 40 males' CT data, with cortical thickness assessed at the outer surface. A statistical shape model captured main variations in tibial morphology and cortical thickness. Finite Element models were created by scaling the mean shape along the first four principal components. Muscle and joint forces from different activities were calculated using static optimization and joint reaction analysis and applied to the models, assessing strained volume and peak strain at middle and distal tibia. The first four principal components accounted for 87 % of the total cumulative variance. Perturbations in the second principal components resulted in the greatest relative differences in peak mid-tibia tensile (128 %) and distal-tibia compressive (160 %) strain during sidestep cutting, but perturbations in the first principal components resulted in the greatest relative differences during other activities (70 %∼118 %, 107 %∼129 %). Perturbations in the first four principal components resulted in the small relative differences in strained volume during walking (-9%∼5%). For runners, tibial size and cortical thickness are more related to tibial fatigue fracture risk, whereas for athletes with frequent directional changes, like basketball players, the tibial shaft size is more relevant.
胫骨的形态和皮质厚度会影响骨骼的强度和应变分布，也会影响疲劳骨折风险。然而，目前的研究尚未广泛探讨形态和皮质厚度对不同活动期间胫骨应变分布的影响。本研究旨在评估胫骨形态和皮质厚度对六种不同运动动作中胫骨应变的影响。从40名男性的CT数据重建胫骨表面，并在外表面评估皮质厚度。统计形状模型捕捉了胫骨形态和皮质厚度的主要变化。通过沿前四个主成分缩放平均形状创建有限元模型。使用静态优化和关节反应分析计算不同活动的肌肉和关节力，并将其应用于模型，评估胫骨中部和远端的应变体积和峰值应变。前四个主成分占总累积方差的87%。在侧步切入时，第二主成分的扰动导致胫骨中部拉伸峰值应变（128%）和胫骨远端压缩峰值应变（160%）的相对差异最大，但在其他活动中，第一主成分的扰动导致相对差异最大（70%至118%，107%至129%）。前四个主成分的扰动导致步行期间应变体积的相对差异较小（-9%至5%）。对于跑步者来说，胫骨大小和皮质厚度与胫骨疲劳骨折风险的关系更大，而对于像篮球运动员这样频繁改变方向的运动员来说，胫骨干大小更相关。
