中国组织工程研究 ›› 2020, Vol. 24 ›› Issue (20): 3157-3161.doi: 10.3969/j.issn.2095-4344.2608

• 软骨组织构建 cartilage tissue construction • 上一篇    下一篇

髋关节软骨高、低负重区微纳结构的力学性质对比

郭江博1,梁  婷1,车艳军1,侯俊俊2,杨惠林1,罗宗平1   

  1. 1苏州大学附属第一医院骨科,骨科研究所,江苏省苏州市  215006;2苏州工业园区星湖医院老年科,江苏省苏州市  215000
  • 收稿日期:2019-08-14 修回日期:2019-08-16 接受日期:2019-09-21 出版日期:2020-07-18 发布日期:2020-04-11
  • 通讯作者: 罗宗平,博士,特聘教授,博士生导师,苏州大学附属第一医院骨科,骨科研究所,江苏省苏州市 215006
  • 作者简介:郭江博,男,1994年生,汉族,苏州大学骨外科学在读硕士,主要从事生物力学、椎间盘退变等研究。 共同第一作者:梁婷,女,1988年生,满族,2014年天津大学毕业,博士,讲师,主要从事骨科生物力学方面的研究。
  • 基金资助:
    江苏省基础研究计划青年基金项目(BK20180196);国家自然科学基金(31570943);江苏省双创团队项目(2015);江苏高校优势学科建设工程项目;江苏省高等学校自然科学面上项目(18KJB180024)

Structure and mechanical properties of high- and low-weight-bearing areas of hip cartilage at micro and nano levels

Guo Jiangbo1, Liang Ting1, Che Yanjun1, Hou Junjun2, Yang Huilin1, Luo Zongping1   

  1. 1Institute of Orthopedics, Department of Orthopedics, First Affiliated Hospital of Soochow University, Suzhou 215006, Jiangsu Province, China; 2Department of Geriatrics, Xinghu Hospital of Suzhou Industrial Park, Suzhou 215000, Jiangsu Province, China
  • Received:2019-08-14 Revised:2019-08-16 Accepted:2019-09-21 Online:2020-07-18 Published:2020-04-11
  • Contact: Luo Zongping, MD, Doctoral supervisor, Institute of Orthopedics, Department of Orthopedics, First Affiliated Hospital of Soochow University, Suzhou 215006, Jiangsu Province, China
  • About author:Guo Jiangbo, Master candidate, Institute of Orthopedics, Department of Orthopedics, First Affiliated Hospital of Soochow University, Suzhou 215006, Jiangsu Province, China Liang Ting, MD, Lecturer, Institute of Orthopedics, Department of Orthopedics, First Affiliated Hospital of Soochow University, Suzhou 215006, Jiangsu Province, China Guo Jiangbo and Liang Ting contributed equally to this work.
  • Supported by:
    Youth Fund Project of Jiangsu Province Basic Research Program, No. BK20180196; National Natural Science Foundation of China, No. 31570943; Jiangsu Double-Innovation Team Project, No. 2015; Superior Discipline Construction Engineering Project of Jiangsu Universities; Natural Science Project of Jiangsu Universities (General Program), No. 18KJB180024

摘要:

文题释义:

微纳层面:相对于宏观层面而言,是对宏观层面的一个补充,由肉眼可见的毫米级别到肉眼不可见的微米、纳米级别。分别使用微米级、纳米级原子力显微镜探针测量软骨微纳弹性模量,以揭示软骨在微纳层面力学性能的特点,以及与宏观层面力学性能的关系。

负重区:在日常活动运动中,由于机体力线等不同,势必造成软骨不同区域负重出现不同,不同的负重也会影响到胶原纤维等物质的重塑重构,引起软骨力学性能的改变。

背景:髋关节软骨具有高、低负重区域,既往研究表明2个区域的宏观弹性模量是不同的。然而在微米和纳米水平上的弹性模量尚不清楚,这些信息对于进一步理解软骨微米和纳米力学性质至关重要。此外,影响软骨2个区域机械性能的微纳结构至今仍有待阐明。

目的:探究微纳层面髋关节软骨高、低负重区力学性质与结构。

方法:取新鲜正常猪股骨头软骨,使用原子力显微镜直径为5 μm的球形尖端测量不同负重区微米级压缩弹性模量,使用曲率半径为5 nm的ScanAsyst-Air探针测量其纳米级压缩弹性模量、纳米结构和胶原纤维直径。扫描电子显微镜用于识别软骨不同负重区微米结构。

结果与结论:①股骨头软骨高负重区微米级弹性模量为(433.05±146.52) kPa,低负重区微米级弹性模量为(331.19±84.88) kPa,高负重区域在微米水平上的压缩弹性模量显著高于低负重区域(P=0.029 8);②股骨头软骨高负重区纳米级弹性模量为(1.24±0.42) GPa,低负重区纳米级弹性模量为(1.28±0.41) GPa,在纳米水平上2个区域的胶原纤维的压缩弹性模量差异无显著性意义(P=0.846 2);③在微米水平上,股骨头软骨高负重区域的胶原纤维排列更规则;在纳米水平上,2个负重区域的胶原纤维直径差异无显著性意义(P=0.926 4);④以上结果表明,股骨头软骨高负重区胶原纤维较低负重区交联更规则,使软骨高负重区微米级压缩弹性模量高于低负重区,与宏观上压缩弹性模量趋势一致,但高负重并没有影响到纳米层面单个胶原纤维。

ORCID: 0000-0001-7971-5372(郭江博)

中国组织工程研究杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松组织工程

关键词: 髋关节软骨, 微纳结构, 弹性模量, 原子力显微镜, 扫描电子显微镜

Abstract:

BACKGROUND: Articular cartilage has a high-weight-bearing area and a low-weight-bearing area. There are different macroscopic elastic moduli in the two regions, but the modulus of the two areas at the micro and nano levels is unknown. Such information is important for further understanding of cartilage micro and nano mechanics. Moreover, the micro and nano structures of the two areas, which influence the cartilage mechanical properties, should be discussed.

OBJECTIVE: To investigate the mechanical properties and structure of high- and low-weight-bearing areas of the hip articular cartilage at the micro and nano levels.

METHODS: Normal porcine femoral head cartilage was used. Atomic force microscopy with a spherical tip of 5 μm in diameter was used to measure the microscale compressive elastic modulus of different weight-bearing areas of the cartilage. The nanoscale compressive elastic modulus, nano structure, and collagen fiber diameter were measured using a ScanAsyst-Air probe with a radius of curvature of 5 nm. Scanning electron microscopy was employed to identify the microstructure of different weight-bearing areas of the cartilage.

RESULTS AND CONCLUSION: The microscale elastic modulus of the high-weight-bearing area of the femoral head cartilage was (433.05±146.52) kPa, and the microscale elastic modulus of the low-weight-bearing area was (331.19±84.88) kPa. The nanoscale elastic modulus of the high- and low-weight-bearing areas of the femoral head cartilage was (1.24±0.42) GPa and (1.28±0.41) GPa, respectively. While no statistically significant differences were found in the elastic modulus of collagen fibers at the nano level (P=0.846 2). The collagen fibers of the high-weight-bearing area arranged more regularly than those of the low-weight-bearing area at the micro level. No significant differences between collagen fiber diameter of the two areas at the nano level were observed (P=0.926 4). To conclude, the collagen fibers of the high-weight-bearing area are cross-linked more regularly than those of low-weight-bearing area. Therefore, the compressive elastic modulus of the high-weight-bearing area at the micro level is significantly higher than that of the low-weight-bearing area, which is consistent with the macroscopic compressive elastic modulus trend. However, high-weight-bearing has no impact on individual collagen fibers at the nano level. 

Key words: hip cartilage, micro-nano structure, elastic modulus, atomic force microscope, scanning electron microscope

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