Finite element analysis of the mechanical strength of a new hip Spacer

BMC Musculoskeletal Disorders

Research

Jianchun Zeng¹  Xianwang Liu²  Hao Ge²  Yiwei Huang²  Hongsong Yan² 

[1] Department of Orthopaedics, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Jichang Road 16#, District 22 Baiyun, 510405, Guangzhou, Guangdong, China;The First Clinical Medical School, Guangzhou University of Chinese Medicine, Jichang Road 12#, District Baiyun, Guangzhou, Guangdong, China;

关键词: Finite element;    Periprosthetic joint infection;    Bone cement;    Spacer;   

DOI  :  10.1186/s12891-023-06562-z

 received in 2023-03-20, accepted in 2023-05-20,  发布年份 2023

来源: Springer

【 摘 要 】

Background and objectiveAt present, the influence of the internal metallic endoskeleton of Spacer on the biomechanical strength of Spacer remains unclear. The aim of this study was to analyze the mechanical stability of a novel Spacer applying a annular skeleton that mimics the structure of trabecular bone using finite element methods.MethedsThe femur models of three healthy individuals and skeletonless Spacer, K-Spacer, and AD-Spacer were assembled to create 15 3D models. Finite element analysis was performed in an Ansys Bench2022R1. Biomechanical parameters such as stress and strain of the Spacer, internal skeleton and femur were evaluated under three loads, which were applied with the maximum force borne by the hip joint (2100 N), standing on one leg (700 N), and standing on two legs (350 N). The mechanical properties of the new hip Spacer were evaluated.ResultThe stresses on the medial and lateral surfaces of the AD-Spacer and K-Spacer were smaller than the stresses in the state without skeletal support. The maximum stresses on the medial and lateral surfaces of the AD-Spacer were smaller than those of the inserted K-Spacer, and the difference gradually increased with the increase of force intensity. When the skeleton diameter was increased from 3 to 4 mm, the stresses in the medial and lateral sides of the AD-Spacer and K-Spacer necks decreased. The stress of both skeletons was concentrated at the neck, but the stress of the annular skeleton was evenly distributed on the medial and lateral sides of the skeleton. The mean stress in the proximal femur was higher in femurs with K-Spacer than in femurs with AD-Spacer.ConclusionsAD-Spacer has lower stress and higher load-bearing capacity than K-Spacer, and the advantages of AD-Spacer are more obvious under the maximum load state of hip joint.

【 授权许可】

CC BY   
© The Author(s) 2023

【 图 表 】

41116_2023_36_Article_IEq267.gif

41116_2023_36_Article_IEq229.gif

41116_2023_36_Article_IEq226.gif

41116_2023_36_Article_IEq223.gif

41116_2023_36_Article_IEq209.gif