Finite Element Analysis of Mobile-bearing Unicompartmental Knee Arthroplasty： The Influence of Tibial Component Coronal Alignment
Background： Controversies about the rational positioning of the tibial component in unicompartmental knee arthroplasty （UKA） still exist. Previous finite element （FE） studies were rare, and the results varied. This FE study aimed to analyze the influence of the tibial component coronal alignment on...
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| Vydáno v: | Chinese medical journal Ročník 128; číslo 21; s. 2873 - 2878 |
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China
Medknow Publications Pvt Ltd
05.11.2015
Medknow Publications and Media Pvt. Ltd Lippincott Williams & Wilkins Ovid Technologies Graduate School of Peking Union Medical College, Beijing 100730, China%Department of Bone and Joint Surgery, China-Japan Friendship Hospital, Beijing 100029, China Department of Bone and Joint Surgery, China-Japan Friendship Hospital, Beijing 100029, China Medknow Publications & Media Pvt Ltd Wolters Kluwer |
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| ISSN: | 0366-6999, 2542-5641 |
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| Abstract | Background： Controversies about the rational positioning of the tibial component in unicompartmental knee arthroplasty （UKA） still exist. Previous finite element （FE） studies were rare, and the results varied. This FE study aimed to analyze the influence of the tibial component coronal alignment on knee biomechanics in mobile-bearing UKA and find a ration range of inclination angles. Methods： A three-dimensional FE model of the intact knee was constructed from image data of one normal subject. A 1000 N compressive load was applied to the intact knee model for validating. Then a set of eleven UKA FE models was developed with the coronal inclination angles of the tibial tray ranging from 10° valgus to 10° varus. Tibial bone stresses and strains, contact pressures and load distribution in all UKA models were calculated and analyzed under the unified loading and boundary conditions. Results： Load distribution, contact pressures, and contact areas in intact knee model were validated. In UKA models, von Mises stress and compressive strain at proximal medial cortical bone increased significantly as the tibial tray was in valgus inclination 〉4°, which may increase the risk of residual pain. Compressive strains at tibial keel slot were above the high threshold with varus inclination 〉4°, which may result in greater risk of component migration. Tibial bone resection comer acted as a strain-raiser regardless of the inclination angles. Compressive strains at the resected surface slightly changed with the varying inclinations and were not supposed to induce bone resorption and component loosening. Contact pressures and load percentage in lateral compartment increased with the more varus inclination, which may lead to osteoarthritis progression. Conclusions： Static knee biomechanics after UKA can be greatly affected by tibial component coronal alignment. A rauge from 4° valgus to 4° varus inclination oftibial component can be recommended in mobile-bearing UKA. |
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| AbstractList | Background: Controversies about the rational positioning of the tibial component in unicompartmental knee arthroplasty (UKA) still exist. Previous finite element (FE) studies were rare, and the results varied. This FE study aimed to analyze the influence of the tibial component coronal alignment on knee biomechanics in mobile-bearing UKA and find a ration range of inclination angles.
Methods: A three-dimensional FE model of the intact knee was constructed from image data of one normal subject. A 1000 N compressive load was applied to the intact knee model for validating. Then a set of eleven UKA FE models was developed with the coronal inclination angles of the tibial tray ranging from 10° valgus to 10° varus. Tibial bone stresses and strains, contact pressures and load distribution in all UKA models were calculated and analyzed under the unified loading and boundary conditions.
Results: Load distribution, contact pressures, and contact areas in intact knee model were validated. In UKA models, von Mises stress and compressive strain at proximal medial cortical bone increased significantly as the tibial tray was in valgus inclination >4°, which may increase the risk of residual pain. Compressive strains at tibial keel slot were above the high threshold with varus inclination >4°, which may result in greater risk of component migration. Tibial bone resection corner acted as a strain-raiser regardless of the inclination angles. Compressive strains at the resected surface slightly changed with the varying inclinations and were not supposed to induce bone resorption and component loosening. Contact pressures and load percentage in lateral compartment increased with the more varus inclination, which may lead to osteoarthritis progression.
Conclusions: Static knee biomechanics after UKA can be greatly affected by tibial component coronal alignment. A range from 4° valgus to 4° varus inclination of tibial component can be recommended in mobile-bearing UKA. Background:Controversies about the rational positioning of the tibial component in unicompartmental knee arthroplasty (UKA) still exist.Previous finite element (FE) studies were rare,and the results varied.This FE study aimed to analyze the influence of the tibial component coronal alignment on knee biomechanics in mobile-bearing UKA and find a ration range of inclination angles.Methods:A three-dimensional FE model of the intact knee was constructed from image data of one normal subject.A 1000 N compressive load was applied to the intact knee model for validating.Then a set of eleven UKA FE models was developed with the coronal inclination angles of the tibial tray ranging from l0° valgus to 10° varus.Tibial bone stresses and strains,contact pressures and load distribution in all UKA models were calculated and analyzed under the unified loading and boundary conditions.Results:Load distribution,contact pressures,and contact areas in intact knee model were validated.In UKA models,von Mises stress and compressive strain at proximal medial cortical bone increased significantly as the tibial tray was in valgus inclination ＞4°,which may increase the risk of residual pain.Compressive strains at tibial keel slot were above the high threshold with varus inclination ＞4°,which may result in greater risk of component migration.Tibial bone resection comer acted as a strain-raiser regardless of the inclination angles.Compressive strains at the resected surface slightly changed with the varying inclinations and were not supposed to induce bone resorption and component loosening.Contact pressures and load percentage in lateral compartment increased with the more varus inclination,which may lead to osteoarthritis progression.Conclusions:Static knee biomechanics after UKA can be greatly affected by tibial component coronal alignment.A range from 4° valgus to 4° varus inclination of tibial component can be recommended in mobile-bearing UKA. Background: Controversies about the rational positioning of the tibial component in unicompartmental knee arthroplasty (UKA) still exist. Previous finite element (FE) studies were rare, and the results varied. This FE study aimed to analyze the influence of the tibial component coronal alignment on knee biomechanics in mobile-bearing UKA and find a ration range of inclination angles. Methods: A three-dimensional FE model of the intact knee was constructed from image data of one normal subject. A 1000 N compressive load was applied to the intact knee model for validating. Then a set of eleven UKA FE models was developed with the coronal inclination angles of the tibial tray ranging from 10° valgus to 10° varus. Tibial bone stresses and strains, contact pressures and load distribution in all UKA models were calculated and analyzed under the unified loading and boundary conditions. Results: Load distribution, contact pressures, and contact areas in intact knee model were validated. In UKA models, von Mises stress and compressive strain at proximal medial cortical bone increased significantly as the tibial tray was in valgus inclination >4°, which may increase the risk of residual pain. Compressive strains at tibial keel slot were above the high threshold with varus inclination >4°, which may result in greater risk of component migration. Tibial bone resection corner acted as a strain-raiser regardless of the inclination angles. Compressive strains at the resected surface slightly changed with the varying inclinations and were not supposed to induce bone resorption and component loosening. Contact pressures and load percentage in lateral compartment increased with the more varus inclination, which may lead to osteoarthritis progression. Conclusions: Static knee biomechanics after UKA can be greatly affected by tibial component coronal alignment. A range from 4° valgus to 4° varus inclination of tibial component can be recommended in mobile-bearing UKA. Background: Controversies about the rational positioning of the tibial component in unicompartmental knee arthroplasty (UKA) still exist. Previous finite element (FE) studies were rare, and the results varied. This FE study aimed to analyze the influence of the tibial component coronal alignment on knee biomechanics in mobile-bearing UKA and find a ration range of inclination angles. Methods: A three-dimensional FE model of the intact knee was constructed from image data of one normal subject. A 1000 N compressive load was applied to the intact knee model for validating. Then a set of eleven UKA FE models was developed with the coronal inclination angles of the tibial tray ranging from 10 valgus to 10 varus. Tibial bone stresses and strains, contact pressures and load distribution in all UKA models were calculated and analyzed under the unified loading and boundary conditions. Results: Load distribution, contact pressures, and contact areas in intact knee model were validated. In UKA models, von Mises stress and compressive strain at proximal medial cortical bone increased significantly as the tibial tray was in valgus inclination >4, which may increase the risk of residual pain. Compressive strains at tibial keel slot were above the high threshold with varus inclination >4, which may result in greater risk of component migration. Tibial bone resection corner acted as a strain-raiser regardless of the inclination angles. Compressive strains at the resected surface slightly changed with the varying inclinations and were not supposed to induce bone resorption and component loosening. Contact pressures and load percentage in lateral compartment increased with the more varus inclination, which may lead to osteoarthritis progression. Conclusions: Static knee biomechanics after UKA can be greatly affected by tibial component coronal alignment. A range from 4 valgus to 4 varus inclination of tibial component can be recommended in mobile-bearing UKA. Controversies about the rational positioning of the tibial component in unicompartmental knee arthroplasty (UKA) still exist. Previous finite element (FE) studies were rare, and the results varied. This FE study aimed to analyze the influence of the tibial component coronal alignment on knee biomechanics in mobile-bearing UKA and find a ration range of inclination angles. A three-dimensional FE model of the intact knee was constructed from image data of one normal subject. A 1000 N compressive load was applied to the intact knee model for validating. Then a set of eleven UKA FE models was developed with the coronal inclination angles of the tibial tray ranging from 10° valgus to 10° varus. Tibial bone stresses and strains, contact pressures and load distribution in all UKA models were calculated and analyzed under the unified loading and boundary conditions. Load distribution, contact pressures, and contact areas in intact knee model were validated. In UKA models, von Mises stress and compressive strain at proximal medial cortical bone increased significantly as the tibial tray was in valgus inclination >4°, which may increase the risk of residual pain. Compressive strains at tibial keel slot were above the high threshold with varus inclination >4°, which may result in greater risk of component migration. Tibial bone resection corner acted as a strain-raiser regardless of the inclination angles. Compressive strains at the resected surface slightly changed with the varying inclinations and were not supposed to induce bone resorption and component loosening. Contact pressures and load percentage in lateral compartment increased with the more varus inclination, which may lead to osteoarthritis progression. Static knee biomechanics after UKA can be greatly affected by tibial component coronal alignment. A range from 4° valgus to 4° varus inclination of tibial component can be recommended in mobile-bearing UKA. BACKGROUNDControversies about the rational positioning of the tibial component in unicompartmental knee arthroplasty (UKA) still exist. Previous finite element (FE) studies were rare, and the results varied. This FE study aimed to analyze the influence of the tibial component coronal alignment on knee biomechanics in mobile-bearing UKA and find a ration range of inclination angles.METHODSA three-dimensional FE model of the intact knee was constructed from image data of one normal subject. A 1000 N compressive load was applied to the intact knee model for validating. Then a set of eleven UKA FE models was developed with the coronal inclination angles of the tibial tray ranging from 10° valgus to 10° varus. Tibial bone stresses and strains, contact pressures and load distribution in all UKA models were calculated and analyzed under the unified loading and boundary conditions.RESULTSLoad distribution, contact pressures, and contact areas in intact knee model were validated. In UKA models, von Mises stress and compressive strain at proximal medial cortical bone increased significantly as the tibial tray was in valgus inclination >4°, which may increase the risk of residual pain. Compressive strains at tibial keel slot were above the high threshold with varus inclination >4°, which may result in greater risk of component migration. Tibial bone resection corner acted as a strain-raiser regardless of the inclination angles. Compressive strains at the resected surface slightly changed with the varying inclinations and were not supposed to induce bone resorption and component loosening. Contact pressures and load percentage in lateral compartment increased with the more varus inclination, which may lead to osteoarthritis progression.CONCLUSIONSStatic knee biomechanics after UKA can be greatly affected by tibial component coronal alignment. A range from 4° valgus to 4° varus inclination of tibial component can be recommended in mobile-bearing UKA. Background： Controversies about the rational positioning of the tibial component in unicompartmental knee arthroplasty （UKA） still exist. Previous finite element （FE） studies were rare, and the results varied. This FE study aimed to analyze the influence of the tibial component coronal alignment on knee biomechanics in mobile-bearing UKA and find a ration range of inclination angles. Methods： A three-dimensional FE model of the intact knee was constructed from image data of one normal subject. A 1000 N compressive load was applied to the intact knee model for validating. Then a set of eleven UKA FE models was developed with the coronal inclination angles of the tibial tray ranging from 10° valgus to 10° varus. Tibial bone stresses and strains, contact pressures and load distribution in all UKA models were calculated and analyzed under the unified loading and boundary conditions. Results： Load distribution, contact pressures, and contact areas in intact knee model were validated. In UKA models, von Mises stress and compressive strain at proximal medial cortical bone increased significantly as the tibial tray was in valgus inclination 〉4°, which may increase the risk of residual pain. Compressive strains at tibial keel slot were above the high threshold with varus inclination 〉4°, which may result in greater risk of component migration. Tibial bone resection comer acted as a strain-raiser regardless of the inclination angles. Compressive strains at the resected surface slightly changed with the varying inclinations and were not supposed to induce bone resorption and component loosening. Contact pressures and load percentage in lateral compartment increased with the more varus inclination, which may lead to osteoarthritis progression. Conclusions： Static knee biomechanics after UKA can be greatly affected by tibial component coronal alignment. A rauge from 4° valgus to 4° varus inclination oftibial component can be recommended in mobile-bearing UKA. |
| Audience | Academic |
| Author | Guang-Duo Zhu Wan-Shou Guo Qi-Dong Zhang Zhao-Hui Liu Li-Ming Cheng |
| AuthorAffiliation | Department of Bone and Joint Surgery, China-Japan Friendship Hospital, Beijing 100029, China Graduate School of Peking Union Medical College, Beijing 100730, China |
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| Author_xml | – sequence: 1 givenname: Guang-Duo surname: Zhu fullname: Zhu, Guang-Duo organization: Department of Bone and Joint Surgery, China-Japan Friendship Hospital, Beijing 100029; Graduate School of Peking Union Medical College, Beijing 100730 – sequence: 2 givenname: Wan-Shou surname: Guo fullname: Guo, Wan-Shou organization: Department of Bone and Joint Surgery, China-Japan Friendship Hospital, Beijing 100029; Graduate School of Peking Union Medical College, Beijing 100730 – sequence: 3 givenname: Qi-Dong surname: Zhang fullname: Zhang, Qi-Dong organization: Department of Bone and Joint Surgery, China-Japan Friendship Hospital, Beijing 100029 – sequence: 4 givenname: Zhao-Hui surname: Liu fullname: Liu, Zhao-Hui organization: Department of Bone and Joint Surgery, China-Japan Friendship Hospital, Beijing 100029 – sequence: 5 givenname: Li-Ming surname: Cheng fullname: Cheng, Li-Ming organization: Department of Bone and Joint Surgery, China-Japan Friendship Hospital, Beijing 100029 |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/26521784$$D View this record in MEDLINE/PubMed |
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| Keywords | Finite Element Analysis Inclination Unicompartmental Knee Arthroplasty Mobile-bearing Strain |
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| Notes | Background： Controversies about the rational positioning of the tibial component in unicompartmental knee arthroplasty （UKA） still exist. Previous finite element （FE） studies were rare, and the results varied. This FE study aimed to analyze the influence of the tibial component coronal alignment on knee biomechanics in mobile-bearing UKA and find a ration range of inclination angles. Methods： A three-dimensional FE model of the intact knee was constructed from image data of one normal subject. A 1000 N compressive load was applied to the intact knee model for validating. Then a set of eleven UKA FE models was developed with the coronal inclination angles of the tibial tray ranging from 10° valgus to 10° varus. Tibial bone stresses and strains, contact pressures and load distribution in all UKA models were calculated and analyzed under the unified loading and boundary conditions. Results： Load distribution, contact pressures, and contact areas in intact knee model were validated. In UKA models, von Mises stress and compressive strain at proximal medial cortical bone increased significantly as the tibial tray was in valgus inclination 〉4°, which may increase the risk of residual pain. Compressive strains at tibial keel slot were above the high threshold with varus inclination 〉4°, which may result in greater risk of component migration. Tibial bone resection comer acted as a strain-raiser regardless of the inclination angles. Compressive strains at the resected surface slightly changed with the varying inclinations and were not supposed to induce bone resorption and component loosening. Contact pressures and load percentage in lateral compartment increased with the more varus inclination, which may lead to osteoarthritis progression. Conclusions： Static knee biomechanics after UKA can be greatly affected by tibial component coronal alignment. A rauge from 4° valgus to 4° varus inclination oftibial component can be recommended in mobile-bearing UKA. Finite Element Analysis; Inclination; Mobile-bearing; Strain; Unicompartmental Knee Arthroplasty 11-2154/R ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23 |
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| PublicationCentury | 2000 |
| PublicationDate | 2015-11-05 |
| PublicationDateYYYYMMDD | 2015-11-05 |
| PublicationDate_xml | – month: 11 year: 2015 text: 2015-11-05 day: 05 |
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| PublicationPlace | China |
| PublicationPlace_xml | – name: China – name: Baltimore – name: India |
| PublicationTitle | Chinese medical journal |
| PublicationTitleAlternate | Chinese Medical Journal |
| PublicationTitle_FL | Chinese Medical Journal |
| PublicationYear | 2015 |
| Publisher | Medknow Publications Pvt Ltd Medknow Publications and Media Pvt. Ltd Lippincott Williams & Wilkins Ovid Technologies Graduate School of Peking Union Medical College, Beijing 100730, China%Department of Bone and Joint Surgery, China-Japan Friendship Hospital, Beijing 100029, China Department of Bone and Joint Surgery, China-Japan Friendship Hospital, Beijing 100029, China Medknow Publications & Media Pvt Ltd Wolters Kluwer |
| Publisher_xml | – name: Medknow Publications Pvt Ltd – name: Medknow Publications and Media Pvt. Ltd – name: Lippincott Williams & Wilkins Ovid Technologies – name: Graduate School of Peking Union Medical College, Beijing 100730, China%Department of Bone and Joint Surgery, China-Japan Friendship Hospital, Beijing 100029, China – name: Department of Bone and Joint Surgery, China-Japan Friendship Hospital, Beijing 100029, China – name: Medknow Publications & Media Pvt Ltd – name: Wolters Kluwer |
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| Snippet | Background： Controversies about the rational positioning of the tibial component in unicompartmental knee arthroplasty （UKA） still exist. Previous finite... Background: Controversies about the rational positioning of the tibial component in unicompartmental knee arthroplasty (UKA) still exist. Previous finite... Controversies about the rational positioning of the tibial component in unicompartmental knee arthroplasty (UKA) still exist. Previous finite element (FE)... BACKGROUNDControversies about the rational positioning of the tibial component in unicompartmental knee arthroplasty (UKA) still exist. Previous finite element... Background:Controversies about the rational positioning of the tibial component in unicompartmental knee arthroplasty (UKA) still exist.Previous finite element... |
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| SubjectTerms | Adult Arthroplasty, Replacement, Knee - methods Bone density Bones Finite Element Analysis Finite Element Analysis; Inclination; Mobile-bearing; Strain; Unicompartmental Knee Arthroplasty Finite element method Health aspects Hip joint Humans Joint surgery Knee Knee Joint - surgery Knee replacement arthroplasty Ligaments Male NMR Nuclear magnetic resonance Original Pressure distribution Stress, Mechanical Studies Surgery Surgical techniques Tibia - surgery Treatment Outcome 排列 有限元分析 移动 组件 置换 胫骨 膝关节 轴承 |
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| Title | Finite Element Analysis of Mobile-bearing Unicompartmental Knee Arthroplasty： The Influence of Tibial Component Coronal Alignment |
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