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132. Kongress der Deutschen Gesellschaft für Chirurgie

Deutsche Gesellschaft für Chirurgie

28.04. - 01.05.2015, München

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A novel device for resistance-free biomechanical testing of the metaphysis of long bones

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  • Leila Harhaus - BG Unfallklinik Ludwigshafen, Klinik für Hand-, Plastische und Rekonstruktive Chirurgie, Ludwigshafen, Deutschland
  • Gina Mackert - BG Unfallklinik Ludwigshafen, Klinik für Hand-, Plastische und Rekonstruktive Chirurgie, Ludwigshafen, Deutschland
  • Christoph Hirche - BG Unfallklinik Ludwigshafen, Klinik für Hand-, Plastische und Rekonstruktive Chirurgie, Ludwigshafen, Deutschland
  • Helmut Harhaus - BG Unfallklinik Ludwigshafen, Klinik für Hand-, Plastische und Rekonstruktive Chirurgie, Ludwigshafen, Deutschland
  • Dimitra Kotsougiani - BG Unfallklinik Ludwigshafen, Klinik für Hand-, Plastische und Rekonstruktive Chirurgie, Ludwigshafen, Deutschland
  • Bernd Höner - SRH Hochschule Heidelberg, Department of Social and Legal Sciences, Heidelberg, Deutschland
  • Ulrich Kneser - BG Unfallklinik Ludwigshafen, Klinik für Hand-, Plastische und Rekonstruktive Chirurgie, Ludwigshafen, Deutschland

Deutsche Gesellschaft für Chirurgie. 132. Kongress der Deutschen Gesellschaft für Chirurgie. München, 28.04.-01.05.2015. Düsseldorf: German Medical Science GMS Publishing House; 2015. Doc15dgch562

doi: 10.3205/15dgch562, urn:nbn:de:0183-15dgch5623

Published: April 24, 2015

© 2015 Harhaus et al.
This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 License. See license information at http://creativecommons.org/licenses/by/4.0/.

Outline

Text

Introduction: Biomechanical testing is an essential component of bone research. In order to test the metaphyseal region of long bones, a typical location for the nowadays increasing field of osteoporotic bone changes, three-point bending and breaking test devices are suitable and widely used. The aim of our study was to increase the effectiveness of this method by using a newly developed ball-mounted platform design. This new design eliminates the negative effects of friction caused by the lengthening of the, on a fixed surface resting, distal tibia along its diaphyseal axis which has been present in previous studies.

Material and methods: 70 tibiae of 35 twelve week old, female Sprague Dawley rats were separated into two groups for a metaphyseal bending/breaking test. Group 1 was made up of the rat’s right tibiae, Group 2 of the left tibiae. Group 1 was tested on a solid metal block according to previously established testing devices whereas Group 2 was tested on the newly designed device: the resistance-free gliding, ball-mounted platform. Stiffness (N/mm), yield Load (N), and failure Load (N) were registered. In the evaluation of both testing procedures, the results of the right and left tibiae were compared according to the rat they originated from.

Results: Stiffness (S) showed highly significant differences (p = 0.002) with 202.25 ± 27.010 N/mm SD (Group 1) and 184.66 ± 35.875 N/mm SD (Group 2). Yield Load (yL) showed highly significant differences (p < 0.001) with 55.31 ± 13.074 N SD (Group1) and 37.17 ± 12.464 N SD (Group2). The mean failure Load (fL) did not differ significantly (p < 0.231) between Group 1: 81.34 ± 11.972 N SD and Group 2: 79.63 ± 10.345 N SD.

Conclusion: We therefore conclude that, used in the three-point bending/breaking test, the mobile, ball-mounted platform device is able to efficiently eliminate the influence of friction in terms of stiffness and yield load. Failure Load was not affected. We suggest that the new ball-mounted platform device, when compared to other existing techniques, generates more accurate test results when used in the three-point bending/breaking test of the metaphysis of long bones.