Page 249 - Adams and Stashak's Lameness in Horses, 7th Edition

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Figure 3.42. (Continued) Dorsoproximal to palmarodistal 9. Proximal part of the medial palmar process on the distal
oblique (D30Pr‐PaDiO) projection of the distal phalanges and phalanx.
navicular bone (foot). (a) Proximal phalanx, (b) middle phalanx, (c) 10. Medial aspect of the distal articular surface on the middle
navicular bone (distal sesamoid bone), (d) distal phalanx. phalanx.
1. Medial and lateral eminences on the distal extremity of the 11. Proximal articular surface of the distal phalanx; palmar and
proximal phalanx for attachment of collateral ligaments. dorsal borders.
2. Medial and lateral depressions for attachment of collateral 12. Fossa on the palmar medial surface of the distal phalanx.
ligaments. 13. Distal palmar border of the navicular bone, which cannot be
3. Proximal palmar border of the middle phalanx. adequately evaluated on this projection because of superimposi­
4. Articular cartilage thickness in the proximal interphalangeal joint tion over the distal interphalangeal joint.
space, which is approximately half the thickness of the articular 14. Extensor process for the distal phalanx.
cartilage in the distal interphalangeal joint. 15. Fossa on palmar lateral surface of the distal phalanx.
5. Medial and lateral eminences for ligamentous and tendinous 16. Proximal part of the lateral palmar process, the size of which
attachments on the proximal palmar aspect of the middle depends on the extent of ossification in the cartilages of the
phalanx. distal phalanx. Separate ossification centers may occur in this
6. Proximal border of the navicular bone, which is seen with the region and should not be mistaken for fracture fragments.
least amount of distortion on this projection. It should be 17. Lateral extremity of the navicular bone, which has a sharper‐
straight, smooth, and distinct. angled appearance than the medial extremity.
7. Dorsal eminences on the medial and lateral aspects of the 18. Proximal articular surface (articular fovea) of the middle
middle phalanx for attachment of the collateral ligaments of the phalanx.
distal interphalangeal joint. 19. Distal articular surface of the proximal phalanx.
8. Medial extremity of the navicular bone, which is slightly more
rounded in appearance than the lateral extremity.

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