Page 284 - Adams and Stashak's Lameness in Horses, 7th Edition

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Figure 3.62. (Continued) Dorsomedial to palmarolateral oblique 19. Palmaromedial border of the second metacarpal bone.
(D60M‐PaLO) projection of the carpus. The relative positions of the 20. Palmaromedial border of the fourth metacarpal bone.
bony ridges on the distocranial aspect of the radius change slightly 21. Dorsolateral border of the second metacarpal bone.
with different X‐ray beam projections. (a) Radius, (b) third metacar­ 22. Dorsolateral border of the fourth metacarpal bone.
pal bone, and (c) accessory carpal bone. 23. Dorsolateral border of the third metacarpal bone.
1. Bony projection from the mediocaudal surface of the radius. 24. Carpometacarpal articulation between the fourth carpal and
2. Transverse crest proximal to the lateral facet (lateral styloid the fourth metacarpal bone.
process) of the radial trochlea. 25. Carpometacarpal articulation between the fourth carpal and
3. Indentation proximal to the medial facet (medial styloid process) the third metacarpal bone.
of the radial trochlea. 26. Carpometacarpal articulation between the third carpal and the
4. Proximal border of the accessory carpal bone. third metacarpal bone.
5. Caudal border of the lateral and intermediate facets of the 27. Palmaromedial border of the third carpal bone.
radial trochlea superimposed. 28. Dorsal border of the second carpal bone.
6. Proximal articular surface of the accessory carpal bone. 29. Dorsal border of the third carpal bone.
7. Palmaromedial border of the intermediate carpal bone. 30. Dorsal border of the fourth carpal bone.
8. Medial facet (medial styloid process) of the radial trochlea. 31. Dorsolateral aspect of the midcarpal joint.
9. Palmaromedial border of the ulnar carpal bone. 32. Dorsal border of the intermediate carpal bone.
10. Distal articular surface of the accessory carpal bone. 33. Dorsal border of the ulnar carpal bone.
11. Palmaromedial border of the radial carpal bone. 34. Dorsal border of the radial carpal bone. The relative position
12. Palmaromedial border of the second carpal bone. and appearance of the dorsal borders of 32, 33, and 34 may
13. Palmaromedial border of the third carpal bone. change with slight projection differences of the X‐ray beam.
14. Palmaromedial border of the fourth carpal bone. 35. Antebrachiocarpal (radiocarpal) joint.
15. First carpal bone. 36. Bony ridge forming the medial border of the groove for the
16. Carpometacarpal articulation between the third carpal and the common digital extensor tendon.
third metacarpal bone. 37. Bony ridge along the lateral border of the extensor carpi radialis
17. Carpometacarpal articulation between the second carpal and tendon.
the second metacarpal bone. 38. Bony ridge between the grooves for the common digital
18. Palmaromedial border of the third metacarpal bone. extensor and the extensor carpi radialis tendons.

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