Segmental variations of in vitro mechanical properties in equine superficial digital flexor tendons

Nathalie Crevier From Equipe Associée INRA, Biomécanique du Cheval (Crevier, Pourcelot, Denoix) and Laboratoire d'Epidémiologie et de Gestion de la Santé Animale (Sanaa), Ecole Nationale Vétérinaire d'Alfort, 7 avenue du Général de Gaulle, 94704 Maisons-Alfort cedex; Laboratoire de Mécanique Physique, Université Paris-Val de Marne, 61 avenue du Général de Gaulle, 94010 Créteil cedex (Geiger); Ecole Normale Supérieure de Cachan, 61 avenue du Président Wilson, 94230 Cachan (Bortolussi); and Ecole Militaire, 1 place Joffre, 75007 Paris (Ribot), France.

Search for other papers by Nathalie Crevier in
Current site
Google Scholar
PubMed
Close
 DVM, MSc
,
Philippe Pourcelot From Equipe Associée INRA, Biomécanique du Cheval (Crevier, Pourcelot, Denoix) and Laboratoire d'Epidémiologie et de Gestion de la Santé Animale (Sanaa), Ecole Nationale Vétérinaire d'Alfort, 7 avenue du Général de Gaulle, 94704 Maisons-Alfort cedex; Laboratoire de Mécanique Physique, Université Paris-Val de Marne, 61 avenue du Général de Gaulle, 94010 Créteil cedex (Geiger); Ecole Normale Supérieure de Cachan, 61 avenue du Président Wilson, 94230 Cachan (Bortolussi); and Ecole Militaire, 1 place Joffre, 75007 Paris (Ribot), France.

Search for other papers by Philippe Pourcelot in
Current site
Google Scholar
PubMed
Close
 MSc
,
Jean-Marie Denoix From Equipe Associée INRA, Biomécanique du Cheval (Crevier, Pourcelot, Denoix) and Laboratoire d'Epidémiologie et de Gestion de la Santé Animale (Sanaa), Ecole Nationale Vétérinaire d'Alfort, 7 avenue du Général de Gaulle, 94704 Maisons-Alfort cedex; Laboratoire de Mécanique Physique, Université Paris-Val de Marne, 61 avenue du Général de Gaulle, 94010 Créteil cedex (Geiger); Ecole Normale Supérieure de Cachan, 61 avenue du Président Wilson, 94230 Cachan (Bortolussi); and Ecole Militaire, 1 place Joffre, 75007 Paris (Ribot), France.

Search for other papers by Jean-Marie Denoix in
Current site
Google Scholar
PubMed
Close
 DVM, PhD
,
Didier Geiger From Equipe Associée INRA, Biomécanique du Cheval (Crevier, Pourcelot, Denoix) and Laboratoire d'Epidémiologie et de Gestion de la Santé Animale (Sanaa), Ecole Nationale Vétérinaire d'Alfort, 7 avenue du Général de Gaulle, 94704 Maisons-Alfort cedex; Laboratoire de Mécanique Physique, Université Paris-Val de Marne, 61 avenue du Général de Gaulle, 94010 Créteil cedex (Geiger); Ecole Normale Supérieure de Cachan, 61 avenue du Président Wilson, 94230 Cachan (Bortolussi); and Ecole Militaire, 1 place Joffre, 75007 Paris (Ribot), France.

Search for other papers by Didier Geiger in
Current site
Google Scholar
PubMed
Close
 PhD
,
Claude Bortolussi From Equipe Associée INRA, Biomécanique du Cheval (Crevier, Pourcelot, Denoix) and Laboratoire d'Epidémiologie et de Gestion de la Santé Animale (Sanaa), Ecole Nationale Vétérinaire d'Alfort, 7 avenue du Général de Gaulle, 94704 Maisons-Alfort cedex; Laboratoire de Mécanique Physique, Université Paris-Val de Marne, 61 avenue du Général de Gaulle, 94010 Créteil cedex (Geiger); Ecole Normale Supérieure de Cachan, 61 avenue du Président Wilson, 94230 Cachan (Bortolussi); and Ecole Militaire, 1 place Joffre, 75007 Paris (Ribot), France.

Search for other papers by Claude Bortolussi in
Current site
Google Scholar
PubMed
Close
 PhD
,
Xavier Ribot From Equipe Associée INRA, Biomécanique du Cheval (Crevier, Pourcelot, Denoix) and Laboratoire d'Epidémiologie et de Gestion de la Santé Animale (Sanaa), Ecole Nationale Vétérinaire d'Alfort, 7 avenue du Général de Gaulle, 94704 Maisons-Alfort cedex; Laboratoire de Mécanique Physique, Université Paris-Val de Marne, 61 avenue du Général de Gaulle, 94010 Créteil cedex (Geiger); Ecole Normale Supérieure de Cachan, 61 avenue du Président Wilson, 94230 Cachan (Bortolussi); and Ecole Militaire, 1 place Joffre, 75007 Paris (Ribot), France.

Search for other papers by Xavier Ribot in
Current site
Google Scholar
PubMed
Close
 DVM
, and
Moez Sanaa From Equipe Associée INRA, Biomécanique du Cheval (Crevier, Pourcelot, Denoix) and Laboratoire d'Epidémiologie et de Gestion de la Santé Animale (Sanaa), Ecole Nationale Vétérinaire d'Alfort, 7 avenue du Général de Gaulle, 94704 Maisons-Alfort cedex; Laboratoire de Mécanique Physique, Université Paris-Val de Marne, 61 avenue du Général de Gaulle, 94010 Créteil cedex (Geiger); Ecole Normale Supérieure de Cachan, 61 avenue du Président Wilson, 94230 Cachan (Bortolussi); and Ecole Militaire, 1 place Joffre, 75007 Paris (Ribot), France.

Search for other papers by Moez Sanaa in
Current site
Google Scholar
PubMed
Close
 PhD

Click on author name to view affiliation information

Abstract

Objective

To determine the local variations of mechanical properties of the equine superficial digital flexor tendon (SDFT).

Sample Population

10 SDFT of adult horses, selected for absence of abnormality.

Procedure

Needles (with a dark marker at both ends) pinned perpendicularly through each tendon to delimit 7 segments. Each tendon was tested in traction until rupture; test was filmed, using an 8-mm video camera. For each image, the coordinates of the center of mass of each marker and the corresponding force were registered. The third-degree polynomial that best fits the stress-strain curve thus obtained was calculated by a least squares approximation. The modulus of elasticity (Emax) of each segment was evaluated as the maximum of the derivative of this polynomial.

Results

Mean rupture load of the 10 SDFT was 12,356 ± 1,333 N. The strain at tendon rupture and Emaxvaried, respectively, from 8.1 ± 1.3% and 1,002 ± 161 MPa (sesamoidean region) to 12.5 ± 1.7% and 1,189 ± 63 MPa (metacarpal region). The values of the strain corresponding to Emax were remarkably similar along the SDFT (approx 5%).

Conclusions

Emax appeared fairly homogeneous along an SDFT, although being slightly higher in the metacarpal region. The 5% strain corresponding to Emax could be the limit strain beyond which microlesions of the tendinous fibers begin to appear, this threshold being first reached during the traction test by the metacarpal segments. (Am J Vet Res 1996;57:1111–1117)

Abstract

Objective

To determine the local variations of mechanical properties of the equine superficial digital flexor tendon (SDFT).

Sample Population

10 SDFT of adult horses, selected for absence of abnormality.

Procedure

Needles (with a dark marker at both ends) pinned perpendicularly through each tendon to delimit 7 segments. Each tendon was tested in traction until rupture; test was filmed, using an 8-mm video camera. For each image, the coordinates of the center of mass of each marker and the corresponding force were registered. The third-degree polynomial that best fits the stress-strain curve thus obtained was calculated by a least squares approximation. The modulus of elasticity (Emax) of each segment was evaluated as the maximum of the derivative of this polynomial.

Results

Mean rupture load of the 10 SDFT was 12,356 ± 1,333 N. The strain at tendon rupture and Emaxvaried, respectively, from 8.1 ± 1.3% and 1,002 ± 161 MPa (sesamoidean region) to 12.5 ± 1.7% and 1,189 ± 63 MPa (metacarpal region). The values of the strain corresponding to Emax were remarkably similar along the SDFT (approx 5%).

Conclusions

Emax appeared fairly homogeneous along an SDFT, although being slightly higher in the metacarpal region. The 5% strain corresponding to Emax could be the limit strain beyond which microlesions of the tendinous fibers begin to appear, this threshold being first reached during the traction test by the metacarpal segments. (Am J Vet Res 1996;57:1111–1117)

All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 76 76 8
PDF Downloads 24 24 2
Advertisement