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Equine Fetlock & Digit Lesley A. Zwicker, BScPharm, DVM Resident, Diagnostic Imaging.

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Presentation on theme: "Equine Fetlock & Digit Lesley A. Zwicker, BScPharm, DVM Resident, Diagnostic Imaging."— Presentation transcript:

1 Equine Fetlock & Digit Lesley A. Zwicker, BScPharm, DVM Resident, Diagnostic Imaging

2 Radiography of the fetlock & foot Horse should be weight-bearing Marker goes lateral/dorsal Prepare foot/leg properly Clean Hoof packed

3 Metacarpophalangeal Joint (Fetlock) Lateral DMPLO DLPMODP

4 Metacarpophalangeal Joint (Fetlock) - Lateral A = Metacarpal III B = Phalanx I (P1) 1 = Sagittal ridge 3 = Palmar process of the proximal phalanx 4 = Condyles of the MCIII 5 = Proximal sesamoid bones

5 Metacarpophalangeal Joint (Fetlock) - DP A = Metacarpal III B = Phalanx I (P1) C = Medial proximal sesamoid D = Lateral proximal sesamoid E = Metacarpophalangeal joint J = Origin of medial collateral ligs (depression) 1 = Sagittal ridge

6 Review of Obliques DLPMO Highlights the dosomedial and lateropalmar aspects of the leg Dorsal Palmar Medial Lateral

7 Review of Obliques DMPLO Highlights the dosolateral and palmaromedial aspects of the leg Dorsal Palmar Medial Lateral

8 Fetlock - DLPMO 1 = Lateral condyle MCIII 6 = Medial condyle MCIII C = Medial proximal sesamoid D = Lateral proximal sesamoid

9 Fetlock - DMPLO 1 = Medial condyle MCIII 2 = Lateral condyle MCIII C = Medial proximal sesamoid D = Lateral proximal sesamoid

10 Interphalangeal Joints Proximal interphalangeal joint Distal interphalangea l joint

11 “No hoof… no horse” Old adage

12 Views of the hoof Lateral DP Dorsoproximal-Palmarodistal Obliques High coronary Upright pedal Skyline (palmaroproximal-to-palmarodistal) of navicular bone

13 Lateral Projection Line drawings taken from Butler’s Clinical Radiology of the Horse, Chapter 2: Foot, Pastern and Fetlock

14 Lateral Projection P1 P2 P3 Navicular bone Extensor process Solar margin

15 Lateral Projection – Surfaces of the Navicular Bone Flexor ArticularProximal Distal

16 Dorsal Palmar Line drawings taken from Butler’s Clinical Radiology of the Horse, Chapter 2: Foot, Pastern and Fetlock

17 Dorsal Palmar P1 P2 P3 Navicular bone Proximal sesamoids

18 Dorsoproximal-Palmarodistal Oblique Different angles & positioning techniques! Angle can be shallow or steep (depending on the region of interest) High coronary versus upright pedal High Coronary Line drawings taken from Butler’s Clinical Radiology of the Horse, Chapter 2: Foot, Pastern and Fetlock

19 Dorsoproximal-Palmarodistal Oblique - Upright Pedal P3 Navicular P2 Butler’s Clinical Radiology of the Horse, Chapter 2: Foot, Pastern and Fetlock

20 Dorsoproximal-Palmarodistal Oblique – High Coronary P3 P2 P1 Navicular bone Crena Vascular channel

21 Palmaroproximal-Palmarodistal Oblique -“Skyline” See the flexor and articular surfaces Evaluate corticomedullary distinction

22 Navicular “Skyline” Navicular: flexor surface Navicular: articular surface

23 Acknowledgement s Thank you to Drs. LeeAnn Pack, Nicholas Urbanek & Virginie De Busscher for content! Line drawings taken from Butler’s Clinical Radiology of the Horse, Chapter 2: Foot, Pastern and Fetlock


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