中国组织工程研究 ›› 2023, Vol. 27 ›› Issue (36): 5766-5770.doi: 10.12307/2023.759

• 骨与关节生物力学 bone and joint biomechanics • 上一篇    下一篇

不同灰度阈值的骨质疏松性骨小梁3D模型的力学性能差异

吴敏辉1,唐昌烨1,代越星1,郑利钦1,2,李志鸿1,李少彬1,林梓凌3   

  1. 1广州中医药大学第一临床医学院,广东省广州市   510405;2广州中医药大学岭南医学研究中心数字骨科与生物力学实验室,广东省广州市   510405;3广州中医药大学第一附属医院创伤骨科,广东省广州市   510405
  • 收稿日期:2022-10-18 接受日期:2022-12-09 出版日期:2023-12-28 发布日期:2023-03-24
  • 通讯作者: 林梓凌,博士, 主任医师,教授,博士生导师,广州中医药大学第一附属医院创伤骨科,广东省广州市 510405
  • 作者简介:吴敏辉,男,1996 年生,宁夏回族自治区永宁县人,汉族,广州中医药大学在读硕士,医师,主要从事骨与关节生物力学方面的研究。
  • 基金资助:
    国家自然科学基金(81673996),项目负责人:林梓凌

Difference in mechanical properties of osteoporotic bone trabecular 3D models with different gray thresholds

Wu Minhui1, Tang Changye1, Dai Yuexing1, Zheng Liqin1, 2, Li Zhihong1, Li Shaobin1, Lin Ziling3   

  1. 1First Clinical Medical College, Guangzhou University of Chinese Medicine, Guangzhou 510405, Guangdong Province, China; 2Laboratory of Digital Orthopedics and Biomechanics, Lingnan Medical Research Center, Guangzhou University of Chinese Medicine, Guangzhou 510405, Guangdong Province, China; 3Department of Orthopedic Trauma, First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510405, Guangdong Province, China
  • Received:2022-10-18 Accepted:2022-12-09 Online:2023-12-28 Published:2023-03-24
  • Contact: Lin Ziling, MD, Chief physician, Professor, Doctoral supervisor, Department of Orthopedic Trauma, First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510405, Guangdong Province, China
  • About author:Wu Minhui, Master candidate, Physician, First Clinical Medical College, Guangzhou University of Chinese Medicine, Guangzhou 510405, Guangdong Province, China
  • Supported by:
    the National Natural Science Foundation of China, No. 81673996 (to LZL)

摘要:


文题释义:

骨小梁:是骨皮质在松质骨内的延伸部分,即骨小梁与骨皮质相连接,在骨髓腔中呈不规则立体网状结构,如丝瓜络样或海绵状,起支持造血组织的作用。

灰度阈值:是将图像中的所有亮度值根据指定的亮度值(即阈值)分成高于阈值和低于阈值的两类。用这种方法产生的黑白掩膜图像可以分开对比度差异较大的地物,如陆地和水体,从而对陆地或水体分别作进一步的处理。


背景:骨质疏松患者多伴有脆性骨折的发生,国内外很少利用3D骨小梁仿真模型压缩实验来阐明其发生发展机制。
目的:建立不同灰度阈值的骨质疏松性骨小梁3D模型,通过机械压缩实验比较分析其骨小梁微结构、力学性能的差异。
方法:选择1例老年骨质疏松性单侧股骨颈骨折患者,女性,69岁,采用GE64排螺旋CT对双侧髋关节自髋臼至股骨中上段行CT扫描,借助Micro-CT重建,建立不同灰度阈值的三维骨小梁模型,获取其微结构参数,通过机械压缩实验得出相关力学性能参数并进行比较。

结果与结论:①成功建立不同灰度阈值的骨质疏松性骨小梁3D模型,随着灰度阈值的增加,骨体积分数降低,骨表面积密度降低,骨小梁数量减少,骨小梁分离度增大;②随着骨小梁灰度阈值的增加其弹性模量降低,可以看出屈服强度、压缩强度及最大抗压力也呈现出这样的趋势;③提示不同灰度阈值所打印的3D骨小梁仿真模型,其骨微细结构参数及力学性能参数有明显差异,可为骨质疏松脆性骨折的发生发展机制在材料力学方面提供一种新的研究方法。

https://orcid.org/0000-0002-5300-4908(吴敏辉) 

中国组织工程研究杂志出版内容重点:人工关节;骨植入物;脊柱;骨折;内固定;数字化骨科;组织工程

关键词: 骨质疏松, 3D打印, 骨小梁, 灰度阈值, 骨体积分数

Abstract: BACKGROUND: Brittle fractures occur in patients with osteoporosis, and the 3D bone trabecular simulation model compression test is rarely used to elucidate the mechanism of its occurrence and development.  
OBJECTIVE: To establish 3D models of osteoporotic bone trabeculae with different gray thresholds, and to compare and analyze the differences in microstructure and mechanical properties of osteoporotic bone trabeculae through mechanical compression experiments.
METHODS: A 69-year-old elderly female patient with osteoporotic unilateral intertrochanteric fracture was selected. Three-dimensional bone trabecular models with different gray thresholds were established by GE64 slice spiral CT scanning of bilateral hip joints from the acetabulum to the upper middle femur and micro-CT reconstruction. Its microstructure parameters were obtained. Mechanical properties were obtained by mechanical compression experiment and compared.
RESULTS AND CONCLUSION: (1) 3D models of osteoporotic bone trabeculae with different gray thresholds were successfully established. With the increase of gray thresholds, the bone volume fraction decreased; the bone surface area density decreased; the trabecular number decreased, and trabecular separation increased. (2) With the increase of the gray threshold of the bone trabecula, its elastic modulus diminished. It could be seen that the yield strength, compressive strength and maximum pressure also exhibited such a trend. (3) It is indicated that the 3D bone trabecular simulation model printed with different gray threshold values has significant differences in the bone fine structure parameters and mechanical property parameters, which provides a new method for the occurrence and development of brittle fractures in osteoporosis in terms of material mechanics. 

Key words: osteoporosis, 3D printing, bone trabecula, gray threshold, bone volume fraction

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