Finite Element Analysis on Different Geometric Shapes of Tibial Component Pegs in Unicompartmental Knee Arthroplasty
10.16156/j.1004-7220.2019.02.12
- VernacularTitle:单髁膝关节置换胫骨元件不同固定柱形状的有限元分析
- Author:
Xinshuo MA
1
;
Jie YAO
1
;
Huizhi WANG
1
;
Xinzheng QI
1
;
Ziyi WEI
1
;
Bolun LIU
1
;
Min ZHANG
2
;
Chengkung CHENG
2
,
3
Author Information
1. School of Biological Science and Medical Engineering, Beihang University
2. School of Biological Science and Medical Engineering, Key Laboratory of Biomechanics and Mechanobiology of Ministry of Education, Beihang University
3. Beijing Advanced Innovation Centre for Biomedical Engineering, Beihang University
- Publication Type:Journal Article
- Keywords:
unicompartmental knee arthroplasty (UKA);
tibial component;
pegs;
stress;
finite element analysis
- From:
Journal of Medical Biomechanics
2019;34(2):E186-E192
- CountryChina
- Language:Chinese
-
Abstract:
Objective Aiming at solving the problems of pain on the anteromedial tibia, tibial component loosening and osteoarthritis progression after unicompartmental knee arthroplasty (UKA), the influence of different geometric shapes of tibial component pegs on stress distributions in tibia was analyzed by finite element method. Methods The finite element models with UKA were established and validated. Geometric shapes of tibial component were designed. Under the same loading condition, the tibial components with double-peg, single-keel, double-keel and cross-star were studied for finite element analysis and compared with intact model, so as to evaluate the influence of tibial component with different shapes on stresses of cortical bone in anteromedial tibia, cancellous bone under tibial component and cartilage in contralateral tibia. Results Compared with the intact model, the peak stress of cortical bone in anteromedial tibia with double-peg, single-keel, double-keel and cross-star tibial components increased by 56.1%, 55.9%, 54.5% and 68-4%, respectively. The peak stress of cancellous bone under tibial component with single-keel and double-keels decreased by 8.1% and 15.6% respectively, while the peak stress of cancellous bone under tibial component with double-peg and cross-star increased by 67-9% and 121-5%, which were higher than the fatigue yield stress of cancellous bone. The peak stress of cartilage in contralateral tibia with double-peg, single-keel, double-keel and cross-star tibial components decreased by 42.1%, 26.6%, 24.2% and 28.5%, respectively. ConclusionsThe load distribution of the medial and lateral tibia changed after UKA operation, and a greater load was observed on the replacement side. Single-keel and double-keel tibial components were more effective in reducing stresses on cortical bone in anteromedial tibia and cancellous bone, while the stress distribution in tibia with single-keel tibial component was closer to that of the intact tibia. The research findings can provide theoretical references for designing single-keel tibial component of unicompartmental knee prosthesis which conforms to better mechanical properties of the knee joint.
