Ageing bone fractures: the case of a ductile to brittle transition that shifts with age

Show simple item record Zioupos, Peter Kirchner, Helmut O. K. Peterlik, Herwig 2019-12-19T18:42:13Z 2019-12-19T18:42:13Z 2019-12-03
dc.identifier.citation Zioupos P, Kirchner HOK, Peterlik H. (2019) Ageing bone fractures: the case of a ductile to brittle transition that shifts with age. Bone, Volume 131, February 2020, Article number 115176 en_UK
dc.identifier.issn 8756-3282
dc.description.abstract Human bone becomes increasingly brittle with ageing. Bones also fracture differently under slow and fast loadings, being ductile and brittle, respectively. The effects of a combination of these two factors have never been examined before. Here we show that cortical bone is most fracture-resistant at the physiologically prevalent intermediate strain rates of 10−3 s−1 to 10−2 s−1 such as they occur in walking or running, slightly weaker at slower quasistatic and much weaker at fast impact loading rates. In young cortical bone (15 years of age) the ductile-to-brittle transition (DBT) occurs at strain rates of 10−2 s−1, in old cortical bone (85 yrs) at speeds lower by a factor of 10 to 40. Other research has shown that the energy required to break bone (per unit of fracture surface) drops as much as 60% between these two ages. Therefore, DBT seems to compound the well-known phenomenon of ‘brittle old bones’. Old bones can only cope with slow movement, young ones with both slow and fast movement. These observed material characteristics of (i) a shift of the DBT and (ii) a reduced energy absorption capacity appear to contribute at least as much to the loss of bone quality as the various quantity based (lowered bone density and mineral content) explanations of the past. They also provide a new powerful paradigm, which allows us to demonstrate mechanically, and uniquely, how human bone becomes increasingly brittle with age. en_UK
dc.language.iso en en_UK
dc.publisher Elsevier en_UK
dc.rights Attribution-NonCommercial-NoDerivatives 4.0 International *
dc.rights.uri *
dc.subject Bone en_UK
dc.subject Ageing en_UK
dc.subject Toughness en_UK
dc.subject Strain rate en_UK
dc.subject Fractures en_UK
dc.subject Biomechanics en_UK
dc.subject Evolution en_UK
dc.title Ageing bone fractures: the case of a ductile to brittle transition that shifts with age en_UK
dc.type Article en_UK
dc.identifier.cris 25473245

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