Page 276 - Adams and Stashak's Lameness in Horses, 7th Edition

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Figure 3.58. (Continued) Lateromedial (LM) projection of the 12. Palmar border of the fourth carpal bone.
carpus. The relative positions of the bony ridges of the distal cranial 13. Proximal palmar border of the second metacarpal bone.
radius depend on the X‐ray beam projection angle. (a) Radius, 14. Proximal palmar border fourth metacarpal bone.
(b) accessory carpal bone, and (c) third metacarpal bone. 15. Proximal palmar border of the third metacarpal bone.
1. Transverse crest, which projects caudad from the closed distal 16. Carpometacarpal joint.
radial physis. 17. Dorsal border of the second carpal bone.
2. Lateral facet of the radial trochlea (lateral styloid process), 18. Dorsal border of the third carpal bone.
which articulates with the ulnar carpal bone. 19. Transverse ridge on the dorsal border of the third carpal bone,
3. Medial facet of the radial trochlea (medial styloid process), which projects with varying degrees of prominence in each
which articulates with the radial carpal bone. horse.
4. Intermediate facet of the radial trochlea, which articulates with 20. Dorsal border of the fourth carpal bone.
the intermediate carpal bone. 21. Midcarpal joint.
5. Tuberosity from the proximal palmar aspect of the intermediate 22. Dorsal border of the radial carpal bone.
carpal bone. 23. Dorsal border of the intermediate carpal bone.
6. Palmar border of the intermediate carpal bone. 24. Dorsal border of the ulnar carpal bone.
7. Palmar border of the radial carpal bone. 25. Antebrachiocarpal (radiocarpal) joint.
8. Palmar border of the ulnar carpal bone. The position of 6, 7, and 26. Lateral bony ridge of the distal cranial radius, adjacent to the
8 may change with slight changes in angulation of the X‐ray common digital extensor tendon.
tube or the horse’s limb. 27. Bony ridge of the distal cranial radius, adjacent to the medial
9. Palmar border of the third carpal bone. border of the extensor carpi radialis tendon.
10. Palmar border of the second carpal bone. 28. Bony ridge of the distal cranial radius between the common
11. First carpal bone, which sometimes is not present. digital extensor tendon and the extensor carpi radialis tendon.

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