Serial in situ compression of spongiosa cylinder observed by µCT, compared to simulated stress, strain and movement.

Illerhaus, Bernhard; BAM Bundesanstalt fur Materialforschung und -prufung; Germany

Illerhaus, B.; Federal Institute for Materials Research and Testing (BAM); Germany
Kunisch, E.; Jena University Hospital; Germany
Kinne, R.W.; Jena University Hospital; Germany

ID: ECNDT-0162-2018
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Sheep vertebral bones after minimal invasive treatment have been used as model for osteoporosis cement treatment [1]. One of the criteria is a strength test of the treated or untreated bones. Here we report on an in situ strength test of small cylindrical cut outs from such bones. While increasing the load a stepwise µCT was done. In the µCT images, the cracking of bones can be located. Thus unwanted effects of irregular load and thus an underperforming of the test example can be excluded. Further we show the good agreement between measured and simulated transformation due to increasing load: A digital volume correlation between following compression test was calculated on the bone surface, assuming homogeneous bone material. The structural mechanic simulation was done directly on the voxel data resulting in maps of Von Mise stresses and predicted displacements.

[1] S.Maenz et al., Enhanced bone formation in sheep vertebral bodies after minimally invasive treatment with a novel, PLGA fiber-reinforced brushite cement. The spine journal 17 (2017), pp. 709-719