Evaluation of displacement of the digital cushion in response to vertical loading in equine forelimbs

Danny D. Taylor Farrier Science Center, 3922 Andert Rd, Bryan, TX 77808.

Search for other papers by Danny D. Taylor in
Current site
Google Scholar
PubMed
Close
 PhD
,
David M. Hood Hoof Diagnostic and Rehabilitation Clinic, PO Box 10381, College Station, TX 77843.
Department of Veterinary Physiology and Pharmacology, Texas A&M University, College Station, TX 77842.

Search for other papers by David M. Hood in
Current site
Google Scholar
PubMed
Close
 DVM, PhD
,
Garry D. Potter College of Veterinary Medicine, the Department of Animal Science, College of Agricultural and Life Sciences, Texas A&M University, College Station, TX 77842.

Search for other papers by Garry D. Potter in
Current site
Google Scholar
PubMed
Close
 PhD
,
Harry A. Hogan Department of Mechanical Engineering, College of Engineering, College of Agricultural and Life Sciences, Texas A&M University, College Station, TX 77842.

Search for other papers by Harry A. Hogan in
Current site
Google Scholar
PubMed
Close
 PhD
, and
Clifford M. Honnas Department of Large Animal Medicine and Surgery, Texas A&M University, College Station, TX 77842.

Search for other papers by Clifford M. Honnas in
Current site
Google Scholar
PubMed
Close
 DVM

Abstract

Objective—To evaluate patterns of digital cushion (DC) displacement that occur in response to vertical loading of the distal portion of the forelimb in horses.

Sample Population—Forelimbs from 10 horses with normal feet.

Procedure—Patterns of DC displacement induced by in vitro vertical limb loading were determined. Loadinduced displacement of the DC was defined as the magnitude and direction of displacement of 6 radiodense, percutaneously implanted markers in specific regions of the DC. The effects of solar support and nonsupport on displacement of the DC were compared.

Results—Regional displacement of the DC occurred principally along distal and palmar vectors in response to vertical loading. Medial or lateral abaxial displacements were variable and appeared to be dependent on response of the limb to the applied load. Displacement of the DC was not affected by the degree of solar support.

Conclusions and Clinical Relevance—Data indicated that the biomechanical function of the DC is to act as a restraint to the displacement of the second phalanx or as a passive structure that allows flexibility of the caudal two thirds of the foot. Results did not indicate that the DC provides a force that induces displacement of or an active restraint against outward displacement of the hoof wall capsule. (Am J Vet Res 2005;66:623–629)

Abstract

Objective—To evaluate patterns of digital cushion (DC) displacement that occur in response to vertical loading of the distal portion of the forelimb in horses.

Sample Population—Forelimbs from 10 horses with normal feet.

Procedure—Patterns of DC displacement induced by in vitro vertical limb loading were determined. Loadinduced displacement of the DC was defined as the magnitude and direction of displacement of 6 radiodense, percutaneously implanted markers in specific regions of the DC. The effects of solar support and nonsupport on displacement of the DC were compared.

Results—Regional displacement of the DC occurred principally along distal and palmar vectors in response to vertical loading. Medial or lateral abaxial displacements were variable and appeared to be dependent on response of the limb to the applied load. Displacement of the DC was not affected by the degree of solar support.

Conclusions and Clinical Relevance—Data indicated that the biomechanical function of the DC is to act as a restraint to the displacement of the second phalanx or as a passive structure that allows flexibility of the caudal two thirds of the foot. Results did not indicate that the DC provides a force that induces displacement of or an active restraint against outward displacement of the hoof wall capsule. (Am J Vet Res 2005;66:623–629)

All Time Past Year Past 30 Days
Abstract Views 75 0 0
Full Text Views 1187 1014 316
PDF Downloads 232 99 6
Advertisement