Stress analysis of trabecular hip prosthesis stem implantation
10.19745/j.1003-8868.2024045
- VernacularTitle:骨小梁髋假体柄植入的应力分析
- Author:
Bo LI
1
;
Li-Lan GAO
;
Ya CHEN
;
Shu-Hong LIU
;
Ya-Hui HU
;
Lin-Wei LYU
;
Jin-Duo YE
;
Chun-Qiu ZHANG
Author Information
1. 天津理工大学天津市先进机电系统设计与智能控制重点实验室,机电工程国家级实验教学示范中心,天津 300384
- Keywords:
total hip replacement;
trabecular bone type prosthesis;
prosthesis stem;
stress shielding;
interface strength;
in-terface distortion
- From:
Chinese Medical Equipment Journal
2024;45(3):29-35
- CountryChina
- Language:Chinese
-
Abstract:
Objective To analyze the stresses in implanted titanium solid and bone trabecular prosthesis hip replacements.Methods A femur model was built inversely based on Mimics software,and optimized using Geomagic software,and then materialized by SolidWorks software.The osteotomized femur was assembled with the metal femoral stem to form a model,and then the model was imported into ABAQUS for finite element calculation.The upper femur was divided into four regions in different states of integration:medial proximal point(small trochanter region),lateral proximal region(large trochanter region),proximal point of the femoral stem(region around the mid-portion of the styloid process)and distal region(around the end of the styloid process and distal portion).Calculations were carried out over the femoral stresses before and after implantation of titanium solid and trabecular prostheses under gait and stair-climbing loads and the interfacial stresses when the region was unintegrated.The type of deformation at the bone interface was analyzed by means of a stress ellipsoid.Results At the small trochanter region,the stress shielding rates of the trabecular prosthesis under gait and stair climbing loads were reduced by 20.5％and 14.7％compared to the titanium solid prosthesis,respectively.In case of different integration states of the titanium solid prosthesis,the interface tensile stresses under the gait and stair climbing loads were up to 10.842 MPa and 12.900 MPa,and the shear stresses reached 7.050 MPa and 6.805 MPa,respectively;in case of different integration states of the trabecular prosthesis,the interface tensile stresses under the gait and stair climbing loads were up to 3.858 MPa and 4.389 MPa,and the shear stresses reached 4.156 MPa and 3.854 MPa,respectively.Under the 2 different loads,the inboard shear stress ellipsoid of the interface opened toward the sides and the bone interface showed tensile deformation;the outboard shear stress ellipsoid of the interface opened up and down and had compressive deformation.Conclusion After total hip arthroplasty,the overall performance of the trabecular prosthesis is better than that of the titanium solid prosthesis.The unintegrated edges of the prosthesis-bone interface are susceptible to stress concentrations and distortion which may result in occurrence of failures.[Chinese Medical Equipment Journal,2024,45(3):29-35]
