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Bone Hardness of Different Anatomical Regions of Human Radius and its Impact on the Pullout Strength of Screws

OBJECTIVE: To investigate the bone hardness of different anatomical regions of the human radius and its impact on the pullout strength of screws. METHODS: Fresh radius bones were obtained from three donated cadavers. They were divided into three parts: proximal metaphysis, shaft, and distal metaphys...

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Autores principales: Wu, Wei‐wei, Zhu, Yan‐bin, Chen, Wei, Li, Sheng, Yin, Bing, Wang, Jian‐zhao, Zhang, Xiao‐juan, Liu, Guo‐bin, Hu, Zu‐sheng, Zhang, Ying‐ze
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley & Sons Australia, Ltd 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6594527/
https://www.ncbi.nlm.nih.gov/pubmed/30908880
http://dx.doi.org/10.1111/os.12436
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author Wu, Wei‐wei
Zhu, Yan‐bin
Chen, Wei
Li, Sheng
Yin, Bing
Wang, Jian‐zhao
Zhang, Xiao‐juan
Liu, Guo‐bin
Hu, Zu‐sheng
Zhang, Ying‐ze
author_facet Wu, Wei‐wei
Zhu, Yan‐bin
Chen, Wei
Li, Sheng
Yin, Bing
Wang, Jian‐zhao
Zhang, Xiao‐juan
Liu, Guo‐bin
Hu, Zu‐sheng
Zhang, Ying‐ze
author_sort Wu, Wei‐wei
collection PubMed
description OBJECTIVE: To investigate the bone hardness of different anatomical regions of the human radius and its impact on the pullout strength of screws. METHODS: Fresh radius bones were obtained from three donated cadavers. They were divided into three parts: proximal metaphysis, shaft, and distal metaphysis. The proximal metaphysis contains the head, neck, and radial tuberosity. The distal metaphysis includes the palmaris radius and the styloid process. The shaft of the radius was divided into nine segments of equal length. The bone hardness of three radiuses, one from each cadaver, was measured by Vickers microindentation hardness tests, and the screw pullout strength was examined in the other three radiuses using a materials testing machine. The trend between radius hardness and pullout strength was analyzed by using an analysis of variance randomized block design. Pearson correlation analysis was performed to evaluate the linear correlation between the bone hardness and the pullout strength of the human radius. RESULTS: The mean hardness ranged from 33.30 HV (the head) to 43.82 HV (the diaphysis). The hardest part of the radius was the shaft, with a value of 42.54 ± 5.59 HV. The proximal metaphysis had a hardness value of 34.15 ± 6.48 HV, and the distal metaphysis hardness value was 35.24 ± 5.17 HV. The shaft was 23.5% harder than the proximal metaphysis and 20% harder than the distal metaphysis. The microhardness test demonstrated that the bone hardness value of the diaphysis was significantly higher than those of both the proximal and distal metaphysis of the radius (both P < 0.05). The mean pullout strength values ranged from 552 N (the distal metaphysis) to 2296 N (the diaphysis). The greatest pullout strength of the radius was observed for the shaft, with a pullout strength of 1727.96 ± 111.44 N. The pullout strength of the proximal metaphysis was 726.33 ± 236.39 N, and the pullout strength of the distal metaphysis was 590.67 ± 36.30 N. The pullout strength of the shaft was 138% greater than that of the proximal metaphysis and 190% greater than that of the distal metaphysis. The pullout strength was also higher in the diaphysis than at both ends of the radius (both P < 0.05). A positive correlation was found between bone hardness and pullout strength (R = 0.927, P < 0.001). CONCLUSIONS: Bone hardness and screw pullout strength are higher in the diaphysis of the radius than at either end. The pullout strength is positively related to bone hardness in the human radius.
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spelling pubmed-65945272019-09-10 Bone Hardness of Different Anatomical Regions of Human Radius and its Impact on the Pullout Strength of Screws Wu, Wei‐wei Zhu, Yan‐bin Chen, Wei Li, Sheng Yin, Bing Wang, Jian‐zhao Zhang, Xiao‐juan Liu, Guo‐bin Hu, Zu‐sheng Zhang, Ying‐ze Orthop Surg Scientific Articles OBJECTIVE: To investigate the bone hardness of different anatomical regions of the human radius and its impact on the pullout strength of screws. METHODS: Fresh radius bones were obtained from three donated cadavers. They were divided into three parts: proximal metaphysis, shaft, and distal metaphysis. The proximal metaphysis contains the head, neck, and radial tuberosity. The distal metaphysis includes the palmaris radius and the styloid process. The shaft of the radius was divided into nine segments of equal length. The bone hardness of three radiuses, one from each cadaver, was measured by Vickers microindentation hardness tests, and the screw pullout strength was examined in the other three radiuses using a materials testing machine. The trend between radius hardness and pullout strength was analyzed by using an analysis of variance randomized block design. Pearson correlation analysis was performed to evaluate the linear correlation between the bone hardness and the pullout strength of the human radius. RESULTS: The mean hardness ranged from 33.30 HV (the head) to 43.82 HV (the diaphysis). The hardest part of the radius was the shaft, with a value of 42.54 ± 5.59 HV. The proximal metaphysis had a hardness value of 34.15 ± 6.48 HV, and the distal metaphysis hardness value was 35.24 ± 5.17 HV. The shaft was 23.5% harder than the proximal metaphysis and 20% harder than the distal metaphysis. The microhardness test demonstrated that the bone hardness value of the diaphysis was significantly higher than those of both the proximal and distal metaphysis of the radius (both P < 0.05). The mean pullout strength values ranged from 552 N (the distal metaphysis) to 2296 N (the diaphysis). The greatest pullout strength of the radius was observed for the shaft, with a pullout strength of 1727.96 ± 111.44 N. The pullout strength of the proximal metaphysis was 726.33 ± 236.39 N, and the pullout strength of the distal metaphysis was 590.67 ± 36.30 N. The pullout strength of the shaft was 138% greater than that of the proximal metaphysis and 190% greater than that of the distal metaphysis. The pullout strength was also higher in the diaphysis than at both ends of the radius (both P < 0.05). A positive correlation was found between bone hardness and pullout strength (R = 0.927, P < 0.001). CONCLUSIONS: Bone hardness and screw pullout strength are higher in the diaphysis of the radius than at either end. The pullout strength is positively related to bone hardness in the human radius. John Wiley & Sons Australia, Ltd 2019-03-25 /pmc/articles/PMC6594527/ /pubmed/30908880 http://dx.doi.org/10.1111/os.12436 Text en © 2019 The Authors. Orthopaedic Surgery published by Chinese Orthopaedic Association and John Wiley & Sons Australia, Ltd This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Scientific Articles
Wu, Wei‐wei
Zhu, Yan‐bin
Chen, Wei
Li, Sheng
Yin, Bing
Wang, Jian‐zhao
Zhang, Xiao‐juan
Liu, Guo‐bin
Hu, Zu‐sheng
Zhang, Ying‐ze
Bone Hardness of Different Anatomical Regions of Human Radius and its Impact on the Pullout Strength of Screws
title Bone Hardness of Different Anatomical Regions of Human Radius and its Impact on the Pullout Strength of Screws
title_full Bone Hardness of Different Anatomical Regions of Human Radius and its Impact on the Pullout Strength of Screws
title_fullStr Bone Hardness of Different Anatomical Regions of Human Radius and its Impact on the Pullout Strength of Screws
title_full_unstemmed Bone Hardness of Different Anatomical Regions of Human Radius and its Impact on the Pullout Strength of Screws
title_short Bone Hardness of Different Anatomical Regions of Human Radius and its Impact on the Pullout Strength of Screws
title_sort bone hardness of different anatomical regions of human radius and its impact on the pullout strength of screws
topic Scientific Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6594527/
https://www.ncbi.nlm.nih.gov/pubmed/30908880
http://dx.doi.org/10.1111/os.12436
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