Department of Bioengineering, University of Illinois College of Engineering, Chicago, IL, USA; RMDR Lab, Department of Biomedical Sciences, University of Illinois College of Medicine, Rockford, IL, USA.
Department of Civil, Materials and Environmental Engineering, University of Illinois, Chicago, IL, USA; College of Civil Engineering and Architecture, Guilin University of Technology, Guilin 541004, China.
J Mech Behav Biomed Mater. 2021 Jun;118:104484. doi: 10.1016/j.jmbbm.2021.104484. Epub 2021 Mar 19.
Total hip replacements (THR) are becoming an common orthopedic surgucal procedure in the United States (332 K/year in 2017) to relieve pain and improve the mobility of those that are affected by osteoarthritis, ankylosing spondylitis, or injury. However, complications like tribocorrosion, or material degradation due to friction and corrosion, may result in THR failure. Unfortunately, few strategies to non-invasively diagnose early-stage complications are reported in literature, leading to implant complications being detected after irreversible damage. Therefore, the main objective of this study proposes the utilization of acoustic emission (AE) to continuously monitor implant materials, CoCrMo and Ti6Al4V, and identify degradations formed during cycles of sleeping, standing, and walking by correlating them to potential and friction coefficient behavior. AE activity detected from the study correlates with the friction coefficient and open-circuit potential observed during recreated in-vitro standing, walking, and sleeping cycles. It was found that the absolute energy level obtained from AE increased as the friction coefficient increased, potential decreased, and wear volume loss increased. Through the results, higher friction coefficient and AE activity were observed in Ti6Al4V alloys while there was also a significant drop in potential, indicating increased tribocorrosion activity. Therefore, AE can be utilized to predict material degradations as a non-invasive method based on the severity of abnormality of the absolute energy and hits emitted. The correlation between potential, friction coefficient, and AE activity was further confirmed through profilometry which showed more material degradation in Ti6Al4V than CoCrMo. Through these evaluations, it was demonstrated that AE could be utilized to identify the deformations and failure modes of implant materials caused by tribocorrosion.
全髋关节置换术（THR）在美国已成为一种常见的矫形外科手术程序（2017 年为 332,000 例），用于缓解骨关节炎、强直性脊柱炎或损伤患者的疼痛并提高其活动能力。然而，由于摩擦和腐蚀导致的摩擦腐蚀或材料降解等并发症，可能导致 THR 失效。不幸的是，文献中很少有报道用于非侵入性诊断早期并发症的策略，导致植入物并发症在不可逆转的损伤后才被发现。因此，本研究的主要目标是提出利用声发射（AE）来连续监测植入材料 CoCrMo 和 Ti6Al4V，并通过将其与潜在和摩擦系数行为相关联，识别在睡眠、站立和行走周期中形成的降解。研究中检测到的 AE 活动与在重新创建的体外站立、行走和睡眠周期中观察到的摩擦系数和开路电位相关。结果发现，AE 获得的绝对能量水平随着摩擦系数的增加、电位的降低和磨损体积损失的增加而增加。通过结果，在 Ti6Al4V 合金中观察到更高的摩擦系数和 AE 活性，同时电位也显著下降，表明摩擦腐蚀活性增加。因此，AE 可以作为一种非侵入性方法，基于绝对能量和发出的撞击的异常严重程度来预测材料降解。通过轮廓测量进一步证实了电位、摩擦系数和 AE 活动之间的相关性，结果显示 Ti6Al4V 的材料降解程度高于 CoCrMo。通过这些评估，证明了 AE 可用于识别由摩擦腐蚀引起的植入材料的变形和失效模式。
