Effects of three different preservation methods on the mechanical properties of human and bovine cortical bone

Unger, Stefan<sup>1,2</sup>; Blauth, Michael<sup>1,2</sup>; Schmoelz, Werner<sup>1,2</sup>

Affiliations

¹Department for Trauma Surgery, Medical University Innsbruck, Anichstrasse 35, A-6020 Innsbruck, Austria

²AO-Trauma Clinical Priority Program “Fracture Fixation in Osteoporotic Bone” (CPP FFOB), AO Foundation, AO-Trauma, Stettbachstraße 6, CH-8600 Duebendorf, Switzerland

Abstract and keywords

Background and purpose: In the development of new strategies for fracture fixation, new methods have to be tested biomechanically under in vitro conditions before clinical trials can be performed. The gold standard for laboratory evaluations is fresh-frozen specimen. As the availability of fresh-frozen specimens is limited and since their use bears infectious risks, specimens treated with various chemical embalming fluids are also used. These preservation methods may alter the mechanical properties of the specimens used. Therefore, the aims of the present study were to determine the effects of three different preservation methods (formalin fixation (FO), Thiel-fixation (TH), and alcohol–glycerine fixation (AG)) on the elastic and postyield mechanical properties of cortical bone and to compare these properties to those of fresh-frozen (FF) specimens.

Materials and methods: Cylindrical cortical specimens (diameter 3 mm, length 60 mm) were obtained from human femurs (n=48) and bovine tibiae (n=40). Before specimen immersion in different fixation fluids, bone mineral density (BMD) as well as the initial Young's modulus was determined. The Young's modulus was determined in a nondestructive bending test, and measurements were repeated after 6 months of immersion in fixative solution. Subsequent to the nondestructive test, a destructive 3-point bending test was conducted to assess the postyield and fracture properties.

Results: The BMD as well as the initial Young's modulus showed no significant differences between the four test groups. After 6 months in fixative solution, the Young's modulus was significantly lowered in human Thiel specimens and only showed minor changes in formalin- and alcohol–glycerine-treated specimens. The plastic energy absorption of human and bovine specimens was altered significantly. Formalin as well as alcohol– glycerine fixation yielded a significant decrease in plastic energy absorption, whereas Thiel fixation significantly increased the plastic energy absorption.

Discussion/conclusion: Because of the significantly altered plastic mechanical properties of cortical bone, the use fresh-frozen bone specimens is recommended in biomechanical studies investigating failure loads of orthopaedic implants. The use of embalmed specimens should be restricted to pilot tests.

Keywords: Cortical bone; Preservation; Mechanical property; Three-point bending; Young's modulus; Energy absorption

Links

DOI: 10.1016/j.bone.2010.08.012

PubMed: 20736094

WoS: 000285278100007

History

Received: 2010-07-02

Revised: 2010-08-17

Accepted: 2010-08-17

Online: 2010-08-21

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2018	Agnew AM, Murach MM, Dominguez VM, Sreedhar A, Misicka E, Harden A, Bolte JH IV, Kang Y-S, Stammen J, Moorhouse K. Sources of variability in structural bending response of pediatric and adult human ribs in dynamic frontal impacts. Proceedings of the Stapp Car Crash Conference. November 2018;62:119-192.
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