Is the crena marginalis normal?

JVMS 83(11): 1745–1749

May 19, 2023

Toe white line separation is a hoof disease that causes cracks, holes, and separation of the white line of the hoof from the hoof wall. This article investigates the relationship between the shape of the notch on the distal phalanx (P3) and the clinical condition of toe white line separation in the hooves of Thoroughbred yearling horses. The authors conducted radiographic examinations of the P3 of both forelimbs of 163 healthy horses and measured the width, depth, and grading of the notch. They found that the width and depth of the notch increased significantly with the grade of toe white line separation, which ranged from 0 to 3. They concluded that radiographic examination of the P3 might be useful for deciding whether to implement hoof care to prevent or treat toe white line separation.

Radiographic images of the P3 showing notches close to the average measurements for each grade. The width (W) and the depth (D) of the notch in each grade shown here are as follows. Grade 0, W 10.7 mm, D 1.2 mm. Grade 1, W 11.7 mm, D 1.9 mm. Grade 2, W 15.1 mm, D 3.7 mm. Grade 3, W 15.8 mm, D 6.2 mm.

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