Structural design of tibial intramedullary stem of artificial knee joint
- VernacularTitle:人工膝关节中胫骨髓内柄的结构设计
- Author:
Xuekun CAO
1
;
Wanpeng DONG
;
Yuefu DONG
;
Zhen ZHANG
;
Jichao ZHANG
;
Jiayi LI
;
Dejun SU
;
Honghao MA
Author Information
1. 上海工程技术大学材料科学与工程学院,上海市 201620
- Keywords:
structure design;
knee joint;
tibial base;
numerical simulation;
prosthesis design;
stress shielding;
artificial joint;
tibial intramedullary stem
- From:
Chinese Journal of Tissue Engineering Research
2024;28(21):3326-3333
- CountryChina
- Language:Chinese
-
Abstract:
BACKGROUND:With social progress,the incidence rate of knee osteoarthritis is getting higher and higher in the face of the rapidly developing aging problem in the social population,and the number of total knee replacement operations is gradually increasing. OBJECTIVE:To study the relationship between prosthesis size and stress shielding by improving the tibial prosthesis base. METHODS:A female patient with severe knee osteoarthritis was selected.Based on Mimics,through extracting the bone structure of the knee joint and simulating the total knee replacement surgery,osteotomy,positioning,and implantation operations were carried out to establish the geometric modeling of the total knee replacement prosthesis(including the femoral prosthesis,tibial bracket,and tibial pad),and improve the design of the tibial prosthesis base,analyze the effect of different tibial prosthesis bases on stress shielding of surrounding bone tissue. RESULTS AND CONCLUSION:(1)Compared with single-stem tibial intramedullary stem prosthesis,the design of four-post tibial intramedullary stem prosthesis created a certain degree of stress shielding around the short stem.However,compared with a thicker single long stem,this stress shielding effect was significantly reduced,and the load was evenly distributed among the four short stems,so there was no stress concentration at the bottom of the pile.(2)The design with a rectangular hole in the middle not only provided relatively good stability,but also helped to reduce stress shielding of cancellous bone to a certain extent,with a reduction rate of 77.5%.(3)Compared with a single-stem tibial intramedullary stem prosthesis,both the four-post tibial intramedullary stem prosthesis and the four-post tibial intramedullary stem prosthesis with a hole in the middle have good stability,which can reduce stress shielding to a certain extent without causing stress concentration,providing theoretical guidance for the design of the tibial intramedullary stem.
