Equine Research Inc. PO Box 8618 Tyler TX 75711

Equine Lameness Book

Table of Contents

EQUINE LAMENESS

LIST OF CHAPTERS
Chapter 1: Defining Lameness
Chapter 2: Lameness Evaluation
Chapter 3: Prepurchase Examinations
Chapter 4: Physical Therapies
Chapter 5: Medications
Chapter 6: Veterinary Procedures
Chapter 7: Hoof Conformation & Shoeing Options
Chapter 8: Joint Problems
Chapter 9: Bone Problems
Chapter 10: Muscle Problems
Chapter 11: Tendon & Ligament Injuries
Chapter 12: Neurologic Causes of Lameness
Chapter 13: Lameness Caused by Skin Problems
Chapter 14: Developmental Orthopedic Disorders
Chapter 15: The Foot
Chapter 16: The Pastern & Fetlock
Chapter 17: The Cannon & Splint Bones
Chapter 18: The Knee
Chapter 19: The Upper Foreleg
Chapter 20: The Hock
Chapter 21: The Upper Hindleg
Chapter 22: The Back
Appendix

SECTION I: INVESTIGATING LAMENESS

CHAPTER 1: DEFINING LAMENESS . . . . . . . . . . 3

Elements of Lameness
   Pain
   Mechanical Restriction of Movement
   Gait Abnormalities Often Confused With Lameness
Identifying the Lame Leg
   Abnormal Stance
   Using Sound
   Observations of Motion
Specific Gait Abnormalities
   Shoulder Lameness
Non-Musculoskeletal Causes of Lameness
   Pleuritis
   Fractured Ribs
   Painful Ovaries
   Mastitis
   Scrotal Problems

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CHAPTER 2: LAMENESS EVALUATION . . . . . . . . . . 19
History
   Record-Keeping
Physical Examination
   Examining the Feet
   Palpation and Manipulation
Gait Evaluation
   Lameness Grading System
   Flexion Tests
Diagnostic Tools & Techniques
   Regional (Local) Anesthesia
   Radiography (x-Rays)
   Ultrasonography (Ultrasound)
   Nuclear Scintigraphy (Bone Scan)
   Arthrocentesis (Joint Tap)
   Bacterial Culture and Antibiotic Sensitivity
   Other Tests

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CHAPTER 3: PREPURCHASE EXAMINATIONS . . . . . . . . . . 65
Preliminary Comments
   Veterinarian's Role
   Farrier's Role
   Before the Examination
The Prepurchase Examination
   Examination at Rest
   Examination While Led or Longed
   Examination While Ridden or Driven
Additional Tests
   Radiography
   Other Imaging Procedures
   Blood Tests
The Prepurchase Report

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SECTION II: PRINCIPLES OF THERAPY

CHAPTER 4: PHYSICAL THERAPIES . . . . . . . . . . 83

Rest
   Restriction Phase
   Regeneration Phase
   Rehabilitation Phase
   Light Exercise as Therapy
Bandaging & Splinting
   Materials
   Bandaging Techniques
   Monitoring and Changing the Bandage
   Splinting Techniques
Specific Physical Therapies
   Heat Therapy
   Hydrotherapy
   Massage
   Passive Motion Exercises
   Chiropractic Manipulation
   Acupuncture
   Homeopathy
   Therapeutic Ultrasound
   Laser Therapy
   Magnetic Field Therapy
   Electrical Tissue Stimulation
Routine Foot Care
   Assessing the Digital Pulses
   Environment
   Daily Hoof Care
   Hoof First-Aid
   Hoof Treatments
Disease Control
   Managing Infected Wounds
   Isolation
   Hygiene and Disinfection
   Rabies

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CHAPTER 5: MEDICATIONS . . . . . . . . . . 135
Anti-inflammatory Therapy
   The Process of Inflammation
   Physical Anti-Inflammatory Therapies
   Anti-Inflammatory Drugs
   Combination Therapies
Tetanus Vaccination
   Tetanus Toxoid and Antitoxin
   Vaccination Schedule
Antibiotics
   Choice of Antibiotic
   Administration Issues
   Potentially Harmful Effects
Joint Medications
   Cartilage Damage
   Medical Options

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CHAPTER 6: VETERINARY PROCEDURES . . . . . . . . . . 171
Joint Lavage
   Technique
Surgery
   Arthroscopic Surgery
   Surgical Repair of Fractures
Casts
   Cast Maintenance
   Cast Removal

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SECTION III: DISEASE PROCESSES & THEIR MANAGEMENT

CHAPTER 7: HOOF CONFORMATION & SHOEING OPTIONS . . . 187

Normal Foot Structure
   Hoof Wall
   Sole, Frog, and Deeper Structures
Influence of Conformation
   Assessing Limb Conformation
   Altering Limb Conformation
   Hoof Balance
   Movement
Shoeing for Support
   Heel Support
   Wall Support
   Sole Support
   Using the Frog for Support
Shoeing Options
   Keg Shoes
   Bar Shoes
   Other Modifications
   Traction Devices

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CHAPTER 8: JOINT PROBLEMS . . . . . . . . . . 245
Joint Structure
   Cartilage
   Joint Fluid
   Supporting Structures
Synovitis & DJD
   Definitions and Causes
   Signs
   Diagnosis
   Treatment
   Prognosis
   Prevention
Septic Arthritis
   Definition
   Causes
   Signs
   Diagnosis
   Treatment
   Prognosis
Wounds Around Joints
Luxation (Dislocation)
   Management
Lyme Disease

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CHAPTER 9: BONE PROBLEMS . . . . . . . . . . 287
Structure & Function
Bone Responses to Stress
   Normal Responses
   Abnormal Responses
   Factors That Influence Bone Quality
Fractures
   Definitions
   Causes
   Signs
   Diagnosis
   Treatment
   Complications
   Rehabilitation After Fracture Repair
   Prognosis
Osteomyelitis
   Definition
   Superficial Osteomyelitis
   Osteomyelitis at a Fracture Site
   Osteomyelitis in Young Foals
Other Bone Conditions
   Nutritional Secondary Hyperparathyroidism
   Rickets
   Hypertrophic Osteopathy

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CHAPTER 10: MUSCLE PROBLEMS . . . . . . . . . . 337
Structure & Function
Muscle Responses
   Muscle Spasms
   Muscle Atrophy
   Muscle Hypertrophy
   Myositis and Myopathy
Muscle Injuries
   Strains and Tears
   Lacerations
   Fibrotic Myopathy
   Compartment Syndrome
Metabolic Muscle Problems
   Exertional Rhabdomyolysis ("Tying up")
   Polysaccharide Storage Myopathy
   Heat-Related Myopathy
   Hypocalcemia
Miscellaneous Conditions
   Intramuscular Injection Reactions
   Bacterial Myositis
    Strep. equi Myopathy
   Hyperkalemic Periodic Paralysis (HPP)
   White Muscle Disease

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CHAPTER 11: TENDON & LIGAMENT INJURIES . . . . . . . . . . 395
Structure & Function
   Digital Flexor Tendons
    Suspensory Ligament
   Extensor Tendon
Tendonitis (Bowed Tendon)
   Definition
   Causes
   Signs
   Diagnosis
   Treatment
   Prognosis
   Prevention
Tendon Lacerations & Rupture
   Flexor Tendons
   Extensor Tendon
Tenosynovitis
   Definition
   Causes
   Signs
   Diagnosis
   Treatment
   Prognosis
Septic Tenosynovitis
   Definition and Causes
   Signs
   Diagnosis
   Treatment
   Prognosis
Check Ligament Injuries
Suspensory Ligament Damage
   Definition
   Causes
   Suspensory Branch Desmitis
   Suspensory Origin Desmitis

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CHAPTER 12: NEUROLOGIC CAUSES OF LAMENESS . . . . . . 439
Structure & Function
   Neurons
   Responses to Injury or Disease
Assessing the Nervous System
   History and Physical Examination
   Neurologic Examination
   Diagnostic Tests
Brain Spinal Cord Conditions
   Trauma
   Cervical Vertebral Malformation ("Wobbler" Syndrome)
   Equine Protozoal Myeloencephalitis (EPM)
   Equine Herpesvirus type 1 Myeloencephalitis
   Equine Degenerative Myelopathy (EDM)
   Rabies
   Other Conditions
Conditions Involving Nerves
   Trauma
   Stringhalt
   Cauda Equina Neuritis
   Equine Motor Neuron Disease (EMND)
   Other Conditions

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CHAPTER 13: LAMENESS CAUSED BY SKIN PROBLEMS . . . . . 519
Wounds
   Wound Healing
   Managing Specific Types of Wounds
Dermatitis
   Bacterial Dermatitis ("Scratches")
   Vesicular Stomatitis
   Immune-Related Skin Disorders
Limb Edema
   "Stocking Up"
   Cellulitis
   Vasculitis
   Ulcerative Lymphangitis ("Big Leg")

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CHAPTER 14: DEVELOPMENTAL ORTHOPEDIC DISORDERS . . . 553
Normal Bone Development
Factors Common to Most DODs
   Growth Rate and Body Size
   Exercise
   Diet
General Management
   Prevention
   Specific Preventive Measures
Angular Limb Deformities
   Definitions
   Causes
   Signs
   Diagnosis
   Treatment
   Prognosis
   Prevention
Flexural Limb Deformities
   Structure of the Flexor Unit
   Flexor Laxity
   Flexor Contracture
Physitis
   Definition
   Causes
   Signs
   Diagnosis
   Treatment
   Prognosis and Prevention
Osteochondrosis
   Definition
   Causes
   Manifestations
   Signs
   Diagnosis
   Treatment
   Prognosis
   Prevention
Osteochondroma

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SECTION IV: TREATMENT OF SPECIFIC CONDITIONS

CHAPTER 15: THE FOOT . . . . . . . . . . 609

Navicular Syndrome
   Definition
   Causes
   Signs
   Diagnosis
   Treatment
   Prognosis
Navicular Bone Fractures
   Causes
   Signs
   Diagnosis
   Treatment
   Prognosis
Laminitis
   Definition
   Causes
   Signs
   Diagnosis
   Treatment
   Prognosis
   Prevention
   Chronic Laminitis
Pedal Osteitis
Pedal Bone Fractures
   Wing Fractures in Foals
   Extensor Process Fractures
   Managing Other Pedal Bone Fractures
   Prognosis
Coffin Joint Arthritis (DJD)
Puncture Wounds
   First Aid Management
   Veterinary Treatment
   Prognosis
Sole Bruises
   Typical Sole Bruises
   Corns
Foot Abscesses
   Subsolar Abscesses
   Hoof Wall Abscesses ("Gravel")
White Line Disease ("Seedy Toe")
   Causes
   Treatment
Keratoma
Quarter Cracks
   Management
Lacerations
   Avulsions
   Coronary Band Lacerations
   Hoof Wall Avulsions
Other Conditions
   Thrush
   Canker
   Sheared Heels
   Sidebone
   Quittor

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CHAPTER 16: THE PASTERN & FETLOCK . . . . . . . . . . 693
Ringbone
   Definition
   Causes
   Signs and Diagnosis
   Treatment
   Prognosis
Pastern Fractures
   Sagittal Fractures
   Comminuted Fractures
   Avulsion Fractures
Chip Fractures
   Definition and Causes
   Signs and Diagnosis
   Treatment
   Prognosis
Palmar Process Fractures
   Definition and Cause
   Signs and Diagnosis
   Treatment and Prognosis
Fetlock DJD
   Osselets
   Flattening of the Bottom of the Cannon Bone
Sesamoiditis
   Definition
   Causes
   Signs
   Diagnosis
   Treatment
   Prognosis
   Prevention
Sesamoid Fractures
   Definitions and Causes
   Signs and Diagnosis
   Treatment
   Prognosis
Distal Sesamoidean Ligament Damage
   Definition and Causes
   Signs and Diagnosis
   Treatment
   Prognosis
   Prevention
Annular Ligament Constriction
   Definition and Causes
   Signs
   Diagnosis
   Treatment
   Prognosis
"Breakdown" Injuries
   Conditions Resulting in "Breakdown"
   First-Aid Care
   Suspensory Ligament Degeneration

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CHAPTER 17: THE CANNON & SPLINT BONES . . . . . . . . . . 793
Bucked Shins
   Definition
   Cause
   Signs
   Diagnosis
   Treatment and Prevention
   Prognosis
Incomplete ("Stress") Fractures
   Dorsal Stress Fractures
   Palmar Stress Fractures
Vertical (Condylar) Fractures
   Definition and Causes
   Signs and Diagnosis
   Treatment
   Prognosis
Complete Cannon Bone Fractures
   Management Problems
Splints
   Definitions
   Causes
   Signs and Diagnosis
   Treatment
   Prognosis
Splint Bone Fractures
   Definition and Causes
   Signs and Diagnosis
   Treatment
   Prognosis

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CHAPTER 18: THE KNEE . . . . . . . . . . 763
Structure & Function
   Bones
   Joints
   Supporting Structures
   Joint Mobility
Swelling at the Front of the Knee
   Problems Outside the Joint Capsule Problems
   Within the Joints
Swelling at the Back of the Knee
   Carpal Canal Syndrome
   Accessory Carpal Bone Fractures
   Other Conditions

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CHAPTER 19: THE UPPER FORELEG . . . . . . . . . . 799
Radius
   Radial Fractures
Elbow
   Fractures
   Degenerative Joint Disease
   Capped Elbow
Humerus
   Humeral Fractures
   Radial Nerve Paralysis
   Bicipital Bursitis
Shoulder
   Osteochondrosis (Including OCD)
   Degenerative Joint Disease
   Shoulder Blade (Scapular) Fractures
   Sweeney

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CHAPTER 20: THE HOCK . . . . . . . . . . 833
Conditions of the Hock Joints
   Bog Spavin
   Osteochondrosis (Including OCD)
   Bone Spavin
   Dislocation of the Hock
Tarsal Bone Fractures
   Slab Fractures
   Maleolus Fractures
   Calcaneus Fractures
Conditions at the Back of the Hock
   Capped Hock
   Achilles Tendon Injuries
   Thoroughpin
   Curb
Other Conditions
   Extensor Tenosynovitis
   Cunean Bursitis
   Stringhalt
   Wounds at the Front of the Hock

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CHAPTER 21: THE UPPER HINDLEG . . . . . . . . . . 865
Tibia
   Tibial Fractures
   Peroneus Tertius Rupture
Fibula
Stifle
   Structure and Function
   Gonitis
   Osteochondrosis (Including OCD)
   Patella Problems
   Cruciate Ligament Injuries
   Meniscus Injuries
   Calcinosis Circumscripta
Femur
   Femoral Fractures
   Dislocation of the Hip
   Trochanteric Bursitis
Pelvis
   Pelvic Fractures
Miscellaneous Conditions
   Exertional Rhabdomyolysis (Tying Up)
   Fibrotic Myopathy
   Aorto-iliac Thrombosis

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CHAPTER 22: THE BACK . . . . . . . . . . 913
Structure & Function
   Vertebrae
   Intervertebral Joints
   Muscles and Mobility
   Spinal Nerves and Reflexes
Neck & Back Pain
   Identifying the Problem
   Treatment Options
Specific Conditions
   Neck Pain
   Pain Over the Withers
   Midback Pain
   Pain Over the Loins and Rump
Flip-Over Injuries
   Injury to the Tail Base
   Injury to the Rump or Withers
   Injury to the Poll
   Whiplash Injury

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APPENDIX . . . . . . . . . . 953
Parts of the Horse
Skeleton of the Horse
Directional Terms
Conversion Tables
Alternate Anatomic Terms
List of Abbreviations
Degrees of Lameness
Understanding the Prognosis
Bibliography
Figure Credits
Glossary
Index

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