Presentation on theme: "Use of a Radiograph to Assist with Therapeutic Shoeing and Trimming"— Presentation transcript:
1 Use of a Radiograph to Assist with Therapeutic Shoeing and Trimming Debra R. Taylor, DVM, MS, DACVIMAssociate ProfessorDepartment of Clinical SciencesCollege of Veterinary MedicineAuburn University
2 Equine Podiatry The specialty dealing with the equine hoof the hoof capsulecoronary bandall anatomical structures with in the hoof capsuleall tendons that affect the hoofRequires the veterinarian and trimmer or farrier to work together
3 What does the horse need? A veterinarian and a trimmer or farrier team who are willing to work togetherA team that enjoys podiatry and is committed to doing their best work
4 What does a farrier or trimmer need from the veterinarian? A veterinarianwho understands what is healthy and what is notwho understands diseases affecting the hoofwho can consistently take an informative radiograph of the footwho is willing to work as part of a teamTake the time to show him the radiographsPre- and post- trimming or shoeingLearn to speak the same languageMany overlapping terms
5 Why do you need a radiograph to monitor shoeing or trimming a horse? “Quality radiographs are to podiatry what ultrasound is to reproduction”Learning curveWithout ultrasound or radiographsWith ultrasound or radiographsAbility to make a positive changeTimeTime
6 Traditional Radiography of the digit GoalsTo evaluate the proximal and distal interphalangeal joints, integrity of bony structures, and to view radiographic degenerative changes in the foot.
7 Traditional Radiography Beam focused at coronary bandFoot packedGround surface not always demarcatedDorsal hoof wall marked with rigid objectApex of frog and heels not markedHoof not always directly against cassette
10 Radiographic GOALS Consistent informative films Take the same view every timeAbility to monitor small changes with accuracyEvaluate the soft tissues of hoofEvaluate P3’s relationship to capsule and groundEvaluate how the bone and the soft tissues relate to each otherHow the bone and soft tissue relate to the groundLearn common parameters of breedsWhat is common is not necessarily healthyHorses have only rarely been bred for hoof qualityPopular breeds are notorious for poor hoof health
11 Radiography for Shoeing and Trimming Center on bottom of P3, not coronary bandmeasure sole depthPalmar/plantar anglemedial to lateral balance of P3Clearly demarcate (with barium paste)Dorsal hoof wall – care to start paste exactly on hairlineLateral heel bulb – care to start paste exactly on hairlineApex of frogClearly demarcate ground surface – lead in wooden blockHoof touching cassetteHeel bulbs parallel to primary beam and perpendicular to cassetteDo not pack the footMeasure sole depthStandardize distance from film to machine
12 Methods Center on bottom of P3 Barium paste on dorsal hoof wall Blocks match machinemetal wire in topBarium paste on dorsal hoof wallBarium on apex of frogBarium on heel
13 Much better Centered bottom of P3 Dorsal hoof wall marked Ground Surface MarkedNot packedHeel markedApex markedNote: -ok that bone is too light, not as worried about boney detail here as relationship of the bone to the soft tissues and groundNOTE: Trimmers and farriers appreciate viewing the hoof in the direction itwould be if they were looking at the horse, RF point toe to right, LF point toe to left
14 Equine Podiatry Radiology Primary beam is 1 cm off top of blocksBuild blocks to match your machine so canSet the machine on the ground and horseWill be in correct positionsNOTE: need two blocksSo horse is standing level
15 BreakoverBreakoverMaybe give more examples of breakover (more normal ones)
16 Podiatry Radiology Measurements Breakover- The horizontal distance from the tip P3 to where the hoof “breaks over” or pivots.0 – 3.5 cm is ideal, depending on the horseoptimizing breakoverdecreases sheer force on P3 and hoof walldecreases tendon and muscle strainAdd word “pivot” change anatomical terms decreases sheer
17 Palmar/plantar AngleNeed to measure angle (or find it).
18 Podiatry Radiology Measurements Palmar AngleThe angle that is formed from the palmar/plantar surface of P3 and the ground ° degrees normal (Adams)What are good palmar angles?
22 Podiatry Radiology Measurements Horn: Laminar ZoneDistance from the dorsal hoofwall to the dorsal surface of P3.Measured at both the dorsal proximal and dorsal distal ends of the foot.Should be uniform and < 20 mm
23 CE ZoneCheck to make sure this is correct… what does it mean if this is greater than 1cm….????
24 Podiatry Radiology Measurements CE Zone- The CE Zone is the vertical distance between the Coronary Band and the Extensor Process.Ideally < 1cm.Need great care in marking the hairline, because plan to monitor change in this numberWhat are good palmar angles?
30 Evaluation of Lateral View Horn: Laminar ZoneShould be uniform ( < 20 mm)CE zone - <1 cmcoronary band - extensor process“halo effect”- coronary band invaginationSole depthmass (> 10 mm)CupBlack area between sole and ground surface
31 Evaluation Lateral View Palmar AngleAngle formed between palmar surface of P3 and groundThe horse wants it positive 3-9 ºDigital Breakoverdistance from the tip of P3 to where hoof breaks forwardThe horse wants it short, maybe even negative?The horse wants it optimized.Bone Angleangle formed between dorsal and palmar surfaces of P3