Pan Yusong, Wang Jing, Ding Guoxin
School of Material Science & Engineering, Anhui University of Science and Technology, Huainan Anhui 232001, China.
Zhong Nan Da Xue Xue Bao Yi Xue Ban. 2012 Jun;37(6):642-8. doi: 10.3969/j.issn.1672-7347.2012.06.018.
The bio-tribological properties of an artificial joint can be obviously improved by surface modification technologies. In this paper, the benefits and disadvantages of various surface modification methods-such as surface coating, plasma treatment, surface texture and surface grafting modification-are discussed. The aim of surface coating and/or plasma treatment is to improve the surface hardness of the materials, thus enhancing the wear resistance of artificial joints. However, these technologies do not effectively alleviate stress concentration of material in the short times in which artificial joints bear physiological impact load, resulting in easy fracture. Surface texture serves mainly to improve the lubrication properties through micro-concavities on the material surface for storage lubricant. Surface texturing can realize improvements in bio-tribological properties, but it does not enhance the impact resistance of the joint. Surface grafting modification is implemented mainly by grafting hydrophilic or other specific functional groups to improve the surface hydrophilicity and wetability, thus enhancing lubricating performance and reducing the coefficient of friction.
表面改性技术可显著改善人工关节的生物摩擦学性能。本文讨论了各种表面改性方法的优缺点，如表面涂层、等离子体处理、表面织构化和表面接枝改性。表面涂层和/或等离子体处理的目的是提高材料的表面硬度，从而增强人工关节的耐磨性。然而，在人工关节承受生理冲击载荷的短时间内，这些技术并不能有效缓解材料的应力集中，导致易断裂。表面织构化主要通过材料表面的微凹坑来储存润滑剂，从而改善润滑性能。表面织构化可以实现生物摩擦学性能的改善，但不能提高关节的抗冲击性。表面接枝改性主要是通过接枝亲水性或其他特定官能团来提高表面亲水性和润湿性，从而增强润滑性能并降低摩擦系数。
