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Quantifying joint congruence with an elastic foundation

Quantifying joint congruence with an elastic foundation
Quantifying joint congruence with an elastic foundation
The level of congruence between the articulating surfaces of
a diarthrodial joint can vary substantially between individuals.
Quantifying joint congruence using the most widespread
metric, the ‘congruence index’, is not straightforward: the
areas of the segmented bone that constitute the articular surfaces
require accurate identification, their shape must be
carefully described with appropriate functions, and the relative
orientation of the surfaces measured precisely. In this
work, we propose a new method of measuring joint congruence,
which does not require these steps. First, a Finite
Element (FE) simulation of an elastic layer compressed between
each set of segmented bones is performed. These are
then interpreted using the elastic foundation model, enabling
an equivalent, but simpler, contact geometry to be identified.
From this, the equivalent radius (quantification of joint congruence)
is found. This defines the radius of a sphere contacting
plane (or ‘ball on flat’) that produces an equivalent
contact to that in each joint. The minimal joint space width
(in this joint position) can also be estimated from the FE simulations.
The new method has been applied to 10 healthy
instances of the thumb metacarpophalangeal (MCP) joint.
The ten thumb MCPs had similar levels and variability of
congruence as the other diarthrodial joints that have been
characterised previously. This new methodology enables efficient
quantification of joint congruence and minimal joint
space width directly from CT or MRI derived bone geometry
in any relative orientation. It lends itself to large data sets
and coupling with kinematic models.
Elastic Foundation, Joint Congruence
0148-0731
Burson-Thomas, Charles
2bacf260-3637-4943-9816-3d8f18c24eb7
Dickinson, Alexander
10151972-c1b5-4f7d-bc12-6482b5870cad
Browne, Martin
6578cc37-7bd6-43b9-ae5c-77ccb7726397
Burson-Thomas, Charles
2bacf260-3637-4943-9816-3d8f18c24eb7
Dickinson, Alexander
10151972-c1b5-4f7d-bc12-6482b5870cad
Browne, Martin
6578cc37-7bd6-43b9-ae5c-77ccb7726397

Burson-Thomas, Charles, Dickinson, Alexander and Browne, Martin (2022) Quantifying joint congruence with an elastic foundation. Journal of Biomechanical Engineering, 144 (10), [101003]. (doi:10.1115/1.4054276).

Record type: Article

Abstract

The level of congruence between the articulating surfaces of
a diarthrodial joint can vary substantially between individuals.
Quantifying joint congruence using the most widespread
metric, the ‘congruence index’, is not straightforward: the
areas of the segmented bone that constitute the articular surfaces
require accurate identification, their shape must be
carefully described with appropriate functions, and the relative
orientation of the surfaces measured precisely. In this
work, we propose a new method of measuring joint congruence,
which does not require these steps. First, a Finite
Element (FE) simulation of an elastic layer compressed between
each set of segmented bones is performed. These are
then interpreted using the elastic foundation model, enabling
an equivalent, but simpler, contact geometry to be identified.
From this, the equivalent radius (quantification of joint congruence)
is found. This defines the radius of a sphere contacting
plane (or ‘ball on flat’) that produces an equivalent
contact to that in each joint. The minimal joint space width
(in this joint position) can also be estimated from the FE simulations.
The new method has been applied to 10 healthy
instances of the thumb metacarpophalangeal (MCP) joint.
The ten thumb MCPs had similar levels and variability of
congruence as the other diarthrodial joints that have been
characterised previously. This new methodology enables efficient
quantification of joint congruence and minimal joint
space width directly from CT or MRI derived bone geometry
in any relative orientation. It lends itself to large data sets
and coupling with kinematic models.

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Accepted/In Press date: 1 April 2022
Published date: 6 May 2022
Keywords: Elastic Foundation, Joint Congruence

Identifiers

Local EPrints ID: 457062
URI: http://eprints.soton.ac.uk/id/eprint/457062
ISSN: 0148-0731
PURE UUID: ea3c0c68-0493-417a-a9e9-8c595994fd02
ORCID for Charles Burson-Thomas: ORCID iD orcid.org/0000-0001-9308-4669
ORCID for Alexander Dickinson: ORCID iD orcid.org/0000-0002-9647-1944
ORCID for Martin Browne: ORCID iD orcid.org/0000-0001-5184-050X

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Date deposited: 23 May 2022 16:41
Last modified: 15 Jun 2022 01:54

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