Week 6 Notes for ANEQ 346
Week 6 Notes for ANEQ 346 ANEQ 346
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This 7 page Class Notes was uploaded by Alia Coughlan on Wednesday September 28, 2016. The Class Notes belongs to ANEQ 346 at Colorado State University taught by Dr Hess in Summer 2016. Since its upload, it has received 5 views. For similar materials see Equine Disease in Equine Science at Colorado State University.
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Date Created: 09/28/16
Week 6 Notes for ANEQ 346 9/26 Lecture 12 Equine Conformation Conformation Relationship of form to function Key to horse’s method of progression Major determination in soundness and useful lifetime Is inherited No PERFECTLY conformed horse *Poor conformation is due to poor breeding programs and man’s opinion Man’s opinion is not always good *Hoof conformation can be due to trimming (bad&good) Normal Conformation Straight line should drop from point of shoulder and bisect the limb (cranial) Straight line from tubar spinae of the scapula should bisect the limb to the fetlock (lateral) Horse should be balanced Conformation Faults Base Narrow Toe In Horse “paddles” which uses extra energy Strain on lateral & collateral ligaments of fetlock and pastern Articular windpuffs Lateral ringbones Lateral sidebones Weight on outside wall Try to correct early on Get’s worse with muscle development Base Wide Toe In Very unusual Strain on inside limb and medial collateral of fetlock and pastern joints Medial sidebone Ringbone Foot lands on inside hoof wall Base Narrow Toe Out Limb interference (winging) Causes major splints Fractures MCII Medial sesamoid Base Wide Toe Out Strain on inside and medial collateral of fetlock and pastern joints Medial sidebone Ringbone Foot lands on inside of hoof wall Calf Knees Knee is backwards Strain on carpal ligaments Dorsal aspect of carpal bones Chip fractures of third, radial and intermediate carpal bone & caudal aspect radius Bow Legged Lateral deviation of carpal bones Tension on lateral surface of the limb Compression of medial carpal bones Knock Knees Medial deviation of carpal bones Abnormal growth plate and inflammation of radius Compression on lateral surface of carpus Open Knees Temporary Growth plates of metacarpals and distal radius Base Narrow Behind Fore and hind limbs will interfere when conformation is good in front Cow Hock Strain on medial side of hock joint May cause Bone Spavin = inflammation of tissue in the hock Straight Behind Little angle between tibia and femur Upward fixation of patella Tension on dorsal aspect of joint capsule Chronic irritation and distention of joint capsule *Front Limb Angles: 4550 degrees *Hind Limb Angles: 5055 degrees *PLEASE check out Dr. Hess’ slides for pictures and such to help you identify the different types of conformations!!!!!!!! 9/28 Lecture 13 Sorting Out Lameness Issues Swinging leg lameness occurs either in the shoulder or the stifle Obvious Injuries and Causes Lacerations Especially ones near joints, tendons or tendon sheaths In the West, barbed wire is a main cause of lacerations Foreign odies Wires, nails, wood, etc Displaced or open fracture Can be very bad especially if bone has gone through the tissue Luxations (displacement) of a joint *All of these are EMERGENCIES CALL YOUR VET! Review of Cardinal Signs of Inflammation Pain True pain response should be repeatable Heat Swelling/Effusion Associated with soft tissues swelling Associated with joints and tendon sheaths – effusion *Gait alteration can happen depending on the degree of lameness. May be easy or difficult to see. AAEP Lameness Grading Scale Grade 1 – Inconsistent lameness in a circle Grade 2 – Inconsistent lameness in a straight line and lame in a circle Grade 3 – Consistent lameness in a straight line ex: when a horse is starting to have navicular pain Grade 4 – Obviously lame at a walk ex: horse with an abscess Grade 5 – Nonweight bearing lameness Forelimb Lameness Signs Head Bob = horse’s head will rise as the horse lands on the lame leg and falls as horse lands on sound leg Fetlock Drop = fetlock (ankle) drops more on sound limb Stride Length = shortened forward phase of stride Acoustics = able to hear the difference in impact between lame and sound limbs Hindlimb Lameness Signs Head Bob = head will go down when the lame leg is weight bearing and will go up on sound leg may or may not be present Hip Drop/Hike = point of hip has greater elevation on lame side Fetlock Drop = less fetlock drop due to decreased weight bearing on lame limb Stride Length = decrease in forward length of stride What Should You Do If emergency, call vet right away Apply ice for 1520 minutes *First line of defense to acute injury is ice What Can Vet Do Provide expertise on horse’s lameness Evaluate horse and determine proper treatment Perform lameness exam How to Localize Lameness Palpation Make sure to pick leg up when doing this Gait evaluation Flexion tests Hoof tester sensitivity Perineural anesthesia (Nerve Blocks) Intraarticular anesthesia (Joint Blocks) Nuclear Scintigraphy (Bone Scan) Conventional radiographs – older method Computed radiography Diagnostic ultrasound MRI CT scan *Anesthesia only tells you where the lameness is, not what it is Potential Treatments Correct trimming and shoeing Antiinflammatories Intraarticular injections with steroids Shockwave treatment stimulates the tissue under the skin Surgery Rest Acupuncture Muscle relaxants Physical therapy
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