Shi Hongxing, Zhang Xiaogang, Chen Zhenxian, Zhang Yali, Jin Zhongmin
Sch Mech Engn, Southwest Jiaotong Univ, Chengdu, 610031, People's Republic of China.
Sch Mech Engn, Minist Educ, Key Lab Rd Construct Technol & Equipment, Changan Univ, Xian, Shaanxi, People's Republic of China.
Med Biol Eng Comput. 2025 Apr;63(4):1189-1200. doi: 10.1007/s11517-024-03257-y. Epub 2024 Dec 16.
The demand for total hip replacement surgery is increasing year by year. However, the issue of hip prosthesis failure, particularly the modular acetabular cup, still exists. The performance and functional requirements of modular acetabular cups have not yet met clinical expectations. This study focused on poly-ether-ether-ketone (PEEK) shells, using finite element methods to investigate their mechanical stability under gait loads and motion, including parameters such as deformation, micromotion, and bone strain. The results showed that a compromise was required among the mechanical performance, stability, and bone integration capabilities of the PEEK shell. As the shell rigidity increased, deformation decreased. However, increased rigidity also increased micromotion at the bone-prosthesis interface, reducing the area that promoted bone ingrowth. Additionally, potential bone absorption areas were also increased, reducing bone preservation and reconstruction capabilities. Compromises need to be made among mechanical performance, stability, and bone integration to achieve optimal mechanical stability. In this study, a 6 mm wall thickness PEEK shell was found to provide good overall mechanical stability.
全髋关节置换手术的需求逐年增加。然而，髋关节假体失败的问题仍然存在，尤其是模块化髋臼杯。模块化髋臼杯的性能和功能要求尚未达到临床预期。本研究聚焦于聚醚醚酮（PEEK）外壳，采用有限元方法研究其在步态负荷和运动下的机械稳定性，包括变形、微动和骨应变等参数。结果表明，PEEK外壳的机械性能、稳定性和骨整合能力之间需要做出权衡。随着外壳刚度增加，变形减小。然而，刚度增加也会增加骨-假体界面处的微动，减少促进骨长入的面积。此外，潜在的骨吸收区域也会增加，降低骨保留和重建能力。需要在机械性能、稳定性和骨整合之间做出权衡，以实现最佳的机械稳定性。在本研究中，发现壁厚为6毫米的PEEK外壳可提供良好的整体机械稳定性。
