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Equine Fetlock & Digit Lesley A. Zwicker, BScPharm, DVM

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Presentation on theme: "Equine Fetlock & Digit Lesley A. Zwicker, BScPharm, DVM"— 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 DP DLPMO

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 Lateral Medial Palmar

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

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 interphalangeal 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 Extensor process P2 P3 Navicular bone
Solar margin

15 Lateral Projection – Surfaces of the Navicular Bone
Articular Proximal Distal Flexor

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

17 Dorsal Palmar Proximal sesamoids P1 P2 Navicular bone P3

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

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

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

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

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

23 Acknowledgements 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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