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Numerical modelling and in-vitro studies of ultrasound signal loss across fractures in cortical bone mimics

Numerical modelling and in-vitro studies of ultrasound signal loss across fractures in cortical bone mimics
Numerical modelling and in-vitro studies of ultrasound signal loss across fractures in cortical bone mimics
The propagation of 200 kHz ultrasonic waves along cortical bone mimics and across a simulated fracture has been investigated using a Finite Difference numerical model. The first arrival signal (FAS) transit time and peak amplitude have been calculated as a function of range at 200kHz in order to help understand the factors that determine the propagation across a fracture. The variation in the amplitude of the first peak of the reradiated wave is studied as a function of the gap width and shape. The results compare well with experimental measurements made in vitro using an axial transmission technique on cortical bone mimics and bovine cortical bone samples. The effects of various stages of the healing process have also been considered by introducing different fracture geometries into the plate model. Changing the geometry to an external callus with different mechanical properties causes the signal loss across the fracture to reduce significantly. The most significant changes are observed to occur from the initial inflammatory stage to the formation of a callus and in the remodelling stage after a significant reduction in the size of the callus has taken place.
0001-4966
pp.3514
Humphrey, Victor F.
23c9bd0c-7870-428f-b0dd-5ff158d22590
Dodd, Simon P.
fed98356-0b31-454c-9025-676073ef3963
Gheduzzi, Sabina
b03b8ba7-7c1c-4c29-84d0-98fc73cfab67
Humphrey, Victor F.
23c9bd0c-7870-428f-b0dd-5ff158d22590
Dodd, Simon P.
fed98356-0b31-454c-9025-676073ef3963
Gheduzzi, Sabina
b03b8ba7-7c1c-4c29-84d0-98fc73cfab67

Humphrey, Victor F., Dodd, Simon P. and Gheduzzi, Sabina (2008) Numerical modelling and in-vitro studies of ultrasound signal loss across fractures in cortical bone mimics. Journal of the Acoustical Society of America, 123 (5), pp.3514. (doi:10.1121/1.2934423).

Record type: Article

Abstract

The propagation of 200 kHz ultrasonic waves along cortical bone mimics and across a simulated fracture has been investigated using a Finite Difference numerical model. The first arrival signal (FAS) transit time and peak amplitude have been calculated as a function of range at 200kHz in order to help understand the factors that determine the propagation across a fracture. The variation in the amplitude of the first peak of the reradiated wave is studied as a function of the gap width and shape. The results compare well with experimental measurements made in vitro using an axial transmission technique on cortical bone mimics and bovine cortical bone samples. The effects of various stages of the healing process have also been considered by introducing different fracture geometries into the plate model. Changing the geometry to an external callus with different mechanical properties causes the signal loss across the fracture to reduce significantly. The most significant changes are observed to occur from the initial inflammatory stage to the formation of a callus and in the remodelling stage after a significant reduction in the size of the callus has taken place.

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More information

Published date: May 2008
Additional Information: Program abstract for Acoustics '08 (Paris).
Organisations: Fluid Dynamics & Acoustics Group

Identifiers

Local EPrints ID: 65315
URI: https://eprints.soton.ac.uk/id/eprint/65315
ISSN: 0001-4966
PURE UUID: 5dc4a7fa-911b-4e37-af05-c0091154c082
ORCID for Victor F. Humphrey: ORCID iD orcid.org/0000-0002-3580-5373

Catalogue record

Date deposited: 27 Feb 2009
Last modified: 14 Mar 2019 01:44

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Contributors

Author: Simon P. Dodd
Author: Sabina Gheduzzi

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