The effect of bilateral palmar digital nerve analgesia on the compressive force experienced by the navicular bone in horses with navicular disease

M P McGuigan, A M Wilson

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26 Citations (Scopus)

Abstract

Horses with navicular disease have an increased load on the navicular bone in early stance. This has been suggested to be a response to pain in the heel region. Seven horses with clinical, radiographic and scintigraphic signs of navicular disease underwent forceplate and kinematic analysis before and after desensitisation of the heel region with a bilateral palmar digital nerve block. The compressive force exerted on the navicular bone during stance, and stride kinematics, were determined in each state. After regional analgesia of the palmar digital nerves (PDNB) the compressive force on the navicular bone was lower throughout stance. The mean +/- s.d. peak force at the beginning of stance was 7.05 +/- 1.10 N/kg before, and 6.46 +/- 1.15 N/kg after PDNB (P = 0.01) and at the end of stance the mean peak values were 5.00 +/- 2.05 N/kg before, and 4.39 +/- 1.65 N/kg after PDNB (P = 0.05), We explained this finding as indicating that the horse responds to heel pain (including pain in the navicular region) by contracting the deep digital flexor muscle to unload the heels. This increases the compressive load on the navicular bone, which may cause remodelling and, in some horses, damage to the overlying flexor cartilage, which is then painful and identified as navicular disease. This mechanism identifies navicular disease as a possible end point for a variety of heel related conditions.
Original languageEnglish
Pages (from-to)166-171
Number of pages6
JournalEquine Veterinary Journal
Volume33
Issue number2
Publication statusPublished - 2001

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navicular disease
Heel
analgesia
Analgesia
Horses
nerve tissue
bones
horses
Bone and Bones
pain
kinematics
Biomechanical Phenomena
Pain
cartilage
Nerve Block
Cartilage
muscles
Muscles

Cite this

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title = "The effect of bilateral palmar digital nerve analgesia on the compressive force experienced by the navicular bone in horses with navicular disease",
abstract = "Horses with navicular disease have an increased load on the navicular bone in early stance. This has been suggested to be a response to pain in the heel region. Seven horses with clinical, radiographic and scintigraphic signs of navicular disease underwent forceplate and kinematic analysis before and after desensitisation of the heel region with a bilateral palmar digital nerve block. The compressive force exerted on the navicular bone during stance, and stride kinematics, were determined in each state. After regional analgesia of the palmar digital nerves (PDNB) the compressive force on the navicular bone was lower throughout stance. The mean +/- s.d. peak force at the beginning of stance was 7.05 +/- 1.10 N/kg before, and 6.46 +/- 1.15 N/kg after PDNB (P = 0.01) and at the end of stance the mean peak values were 5.00 +/- 2.05 N/kg before, and 4.39 +/- 1.65 N/kg after PDNB (P = 0.05), We explained this finding as indicating that the horse responds to heel pain (including pain in the navicular region) by contracting the deep digital flexor muscle to unload the heels. This increases the compressive load on the navicular bone, which may cause remodelling and, in some horses, damage to the overlying flexor cartilage, which is then painful and identified as navicular disease. This mechanism identifies navicular disease as a possible end point for a variety of heel related conditions.",
author = "McGuigan, {M P} and Wilson, {A M}",
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T1 - The effect of bilateral palmar digital nerve analgesia on the compressive force experienced by the navicular bone in horses with navicular disease

AU - McGuigan, M P

AU - Wilson, A M

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N2 - Horses with navicular disease have an increased load on the navicular bone in early stance. This has been suggested to be a response to pain in the heel region. Seven horses with clinical, radiographic and scintigraphic signs of navicular disease underwent forceplate and kinematic analysis before and after desensitisation of the heel region with a bilateral palmar digital nerve block. The compressive force exerted on the navicular bone during stance, and stride kinematics, were determined in each state. After regional analgesia of the palmar digital nerves (PDNB) the compressive force on the navicular bone was lower throughout stance. The mean +/- s.d. peak force at the beginning of stance was 7.05 +/- 1.10 N/kg before, and 6.46 +/- 1.15 N/kg after PDNB (P = 0.01) and at the end of stance the mean peak values were 5.00 +/- 2.05 N/kg before, and 4.39 +/- 1.65 N/kg after PDNB (P = 0.05), We explained this finding as indicating that the horse responds to heel pain (including pain in the navicular region) by contracting the deep digital flexor muscle to unload the heels. This increases the compressive load on the navicular bone, which may cause remodelling and, in some horses, damage to the overlying flexor cartilage, which is then painful and identified as navicular disease. This mechanism identifies navicular disease as a possible end point for a variety of heel related conditions.

AB - Horses with navicular disease have an increased load on the navicular bone in early stance. This has been suggested to be a response to pain in the heel region. Seven horses with clinical, radiographic and scintigraphic signs of navicular disease underwent forceplate and kinematic analysis before and after desensitisation of the heel region with a bilateral palmar digital nerve block. The compressive force exerted on the navicular bone during stance, and stride kinematics, were determined in each state. After regional analgesia of the palmar digital nerves (PDNB) the compressive force on the navicular bone was lower throughout stance. The mean +/- s.d. peak force at the beginning of stance was 7.05 +/- 1.10 N/kg before, and 6.46 +/- 1.15 N/kg after PDNB (P = 0.01) and at the end of stance the mean peak values were 5.00 +/- 2.05 N/kg before, and 4.39 +/- 1.65 N/kg after PDNB (P = 0.05), We explained this finding as indicating that the horse responds to heel pain (including pain in the navicular region) by contracting the deep digital flexor muscle to unload the heels. This increases the compressive load on the navicular bone, which may cause remodelling and, in some horses, damage to the overlying flexor cartilage, which is then painful and identified as navicular disease. This mechanism identifies navicular disease as a possible end point for a variety of heel related conditions.

M3 - Article

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JF - Equine Veterinary Journal

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