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Whole bone testing in small animals: systematic characterization of the mechanical properties of different rodent bones available for rat fracture models

OBJECTIVES: Rat fracture models are extensively used to characterize normal and pathological bone healing. Despite, systematic research on inter- and intra-individual differences of common rat bones examined is surprisingly not available. Thus, we studied the biomechanical behaviour and radiological...

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Autores principales: Prodinger, Peter M., Foehr, Peter, Bürklein, Dominik, Bissinger, Oliver, Pilge, Hakan, Kreutzer, Kilian, von Eisenhart-Rothe, Rüdiger, Tischer, Thomas
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5813325/
https://www.ncbi.nlm.nih.gov/pubmed/29444703
http://dx.doi.org/10.1186/s40001-018-0307-z
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author Prodinger, Peter M.
Foehr, Peter
Bürklein, Dominik
Bissinger, Oliver
Pilge, Hakan
Kreutzer, Kilian
von Eisenhart-Rothe, Rüdiger
Tischer, Thomas
author_facet Prodinger, Peter M.
Foehr, Peter
Bürklein, Dominik
Bissinger, Oliver
Pilge, Hakan
Kreutzer, Kilian
von Eisenhart-Rothe, Rüdiger
Tischer, Thomas
author_sort Prodinger, Peter M.
collection PubMed
description OBJECTIVES: Rat fracture models are extensively used to characterize normal and pathological bone healing. Despite, systematic research on inter- and intra-individual differences of common rat bones examined is surprisingly not available. Thus, we studied the biomechanical behaviour and radiological characteristics of the humerus, the tibia and the femur of the male Wistar rat—all of which are potentially available in the experimental situation—to identify useful or detrimental biomechanical properties of each bone and to facilitate sample size calculations. METHODS: 40 paired femura, tibiae and humeri of male Wistar rats (10–38 weeks, weight between 240 and 720 g) were analysed by DXA, pQCT scan and three-point-bending. Bearing and loading bars of the biomechanical setup were adapted percentually to the bone’s length. Subgroups of light (skeletal immature) rats under 400 g (N = 11, 22 specimens of each bone) and heavy (mature) rats over 400 g (N = 9, 18 specimens of each bone) were formed and evaluated separately. RESULTS: Radiologically, neither significant differences between left and right bones, nor a specific side preference was evident. Mean side differences of the BMC were relatively small (1–3% measured by DXA and 2.5–5% by pQCT). Over all, bone mineral content (BMC) assessed by DXA and pQCT (TOT CNT, CORT CNT) showed high correlations between each other (BMC vs. TOT and CORT CNT: R(2) = 0.94–0.99). The load–displacement diagram showed a typical, reproducible curve for each type of bone. Tibiae were the longest bones (mean 41.8 ± 4.12 mm) followed by femurs (mean 38.9 ± 4.12 mm) and humeri (mean 29.88 ± 3.33 mm). Failure loads and stiffness ranged from 175.4 ± 45.23 N / 315.6 ± 63.00 N/mm for the femurs, 124.6 ± 41.13 N / 260.5 ± 59.97 N/mm for the humeri to 117.1 ± 33.94 N / 143.8 ± 36.99 N/mm for the tibiae. Smallest interindividual differences were observed in failure loads of the femurs (CV% 8.6) and tibiae (CV% 10.7) of heavy animals, light animals showed good consistency in failure loads of the humeri (CV% 7.7). Most consistent results of both sides (left vs. right) in failure loads were provided by the femurs of light animals (mean difference 4.0 ± 2.8%); concerning stiffness, humeri of heavy animals were most consistent (mean difference of 6.2 ± 5%). In general, the failure loads showed strong correlations to the BMC (R(2) = 0.85–0.88) whereas stiffness correlated only moderate, except for the humerus (BMC vs. stiffness: R(2) = 0.79). DISCUSSION: Altogether, the rat’s femur of mature specimens showed the most accurate and consistent radiological and biomechanical results. In synopsis with the common experimental use enabling comparison among different studies, this bone offers ideal biomechanical conditions for three point bending experiments. This can be explained by the combination of a superior aspect ratio and a round and long, straight morphology, which satisfies the beam criteria more than other bones tested. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1186/s40001-018-0307-z) contains supplementary material, which is available to authorized users.
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spelling pubmed-58133252018-02-16 Whole bone testing in small animals: systematic characterization of the mechanical properties of different rodent bones available for rat fracture models Prodinger, Peter M. Foehr, Peter Bürklein, Dominik Bissinger, Oliver Pilge, Hakan Kreutzer, Kilian von Eisenhart-Rothe, Rüdiger Tischer, Thomas Eur J Med Res Research OBJECTIVES: Rat fracture models are extensively used to characterize normal and pathological bone healing. Despite, systematic research on inter- and intra-individual differences of common rat bones examined is surprisingly not available. Thus, we studied the biomechanical behaviour and radiological characteristics of the humerus, the tibia and the femur of the male Wistar rat—all of which are potentially available in the experimental situation—to identify useful or detrimental biomechanical properties of each bone and to facilitate sample size calculations. METHODS: 40 paired femura, tibiae and humeri of male Wistar rats (10–38 weeks, weight between 240 and 720 g) were analysed by DXA, pQCT scan and three-point-bending. Bearing and loading bars of the biomechanical setup were adapted percentually to the bone’s length. Subgroups of light (skeletal immature) rats under 400 g (N = 11, 22 specimens of each bone) and heavy (mature) rats over 400 g (N = 9, 18 specimens of each bone) were formed and evaluated separately. RESULTS: Radiologically, neither significant differences between left and right bones, nor a specific side preference was evident. Mean side differences of the BMC were relatively small (1–3% measured by DXA and 2.5–5% by pQCT). Over all, bone mineral content (BMC) assessed by DXA and pQCT (TOT CNT, CORT CNT) showed high correlations between each other (BMC vs. TOT and CORT CNT: R(2) = 0.94–0.99). The load–displacement diagram showed a typical, reproducible curve for each type of bone. Tibiae were the longest bones (mean 41.8 ± 4.12 mm) followed by femurs (mean 38.9 ± 4.12 mm) and humeri (mean 29.88 ± 3.33 mm). Failure loads and stiffness ranged from 175.4 ± 45.23 N / 315.6 ± 63.00 N/mm for the femurs, 124.6 ± 41.13 N / 260.5 ± 59.97 N/mm for the humeri to 117.1 ± 33.94 N / 143.8 ± 36.99 N/mm for the tibiae. Smallest interindividual differences were observed in failure loads of the femurs (CV% 8.6) and tibiae (CV% 10.7) of heavy animals, light animals showed good consistency in failure loads of the humeri (CV% 7.7). Most consistent results of both sides (left vs. right) in failure loads were provided by the femurs of light animals (mean difference 4.0 ± 2.8%); concerning stiffness, humeri of heavy animals were most consistent (mean difference of 6.2 ± 5%). In general, the failure loads showed strong correlations to the BMC (R(2) = 0.85–0.88) whereas stiffness correlated only moderate, except for the humerus (BMC vs. stiffness: R(2) = 0.79). DISCUSSION: Altogether, the rat’s femur of mature specimens showed the most accurate and consistent radiological and biomechanical results. In synopsis with the common experimental use enabling comparison among different studies, this bone offers ideal biomechanical conditions for three point bending experiments. This can be explained by the combination of a superior aspect ratio and a round and long, straight morphology, which satisfies the beam criteria more than other bones tested. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1186/s40001-018-0307-z) contains supplementary material, which is available to authorized users. BioMed Central 2018-02-14 /pmc/articles/PMC5813325/ /pubmed/29444703 http://dx.doi.org/10.1186/s40001-018-0307-z Text en © The Author(s) 2018 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
spellingShingle Research
Prodinger, Peter M.
Foehr, Peter
Bürklein, Dominik
Bissinger, Oliver
Pilge, Hakan
Kreutzer, Kilian
von Eisenhart-Rothe, Rüdiger
Tischer, Thomas
Whole bone testing in small animals: systematic characterization of the mechanical properties of different rodent bones available for rat fracture models
title Whole bone testing in small animals: systematic characterization of the mechanical properties of different rodent bones available for rat fracture models
title_full Whole bone testing in small animals: systematic characterization of the mechanical properties of different rodent bones available for rat fracture models
title_fullStr Whole bone testing in small animals: systematic characterization of the mechanical properties of different rodent bones available for rat fracture models
title_full_unstemmed Whole bone testing in small animals: systematic characterization of the mechanical properties of different rodent bones available for rat fracture models
title_short Whole bone testing in small animals: systematic characterization of the mechanical properties of different rodent bones available for rat fracture models
title_sort whole bone testing in small animals: systematic characterization of the mechanical properties of different rodent bones available for rat fracture models
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5813325/
https://www.ncbi.nlm.nih.gov/pubmed/29444703
http://dx.doi.org/10.1186/s40001-018-0307-z
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