[Radiologic follow-up examination of podotrochlosis].

This research examined how X-rays of horses affected by a condition known as podotrochlosis (or navicular disease), changed over time, finding that changes in bone and vascular structure could occur within a few months and that a certain type of treatment, neurectomy, was associated with a more intensive development of changes in bone and vascular structure.

Background and Methodology

• The study analyzed X-rays from 205 horses affected by podotrochlosis, a painful condition affecting the hoof of a horse.
• The X-rays were taken from multiple angles (dorsopalmar and lateromedial) and from each foreleg.
• The researchers reexamined the X-rays up to six times to track changes and progression in the disease.

Key Findings

• The researchers found differences in the x-rays regarding the limitation of vascular foramina (openings in a bone through which vessels pass) and the presence of cyst-like lesions.
• Vascular foramina with a sclerotic rim (hardened edge) were less frequent compared to poorly defined ones, making them easier for the veterinarians to make prognostications (predictions about the disease’s progression).
• Cyst-like lesions with a sclerotic rim often remained unchanged or even reduced in number, while poorly defined areas of rarefication (areas where the bone becomes less dense) showed a stronger tendency to spread into the surrounding spongy bone.
• Both alterations in the bone and in the vascular structure occurred within a few months.
• Most of the changes were already evident in the early stages of the disease and progressed slowly.

Impact of Treatment

• The researchers also investigated the effects of a treatment for navicular disease called neurectomy (surgically removing a piece of nerve tissue).
• The x-rays indicated that horses who underwent a neurectomy experienced a more accelerated progression of the disease’s changes.

Conclusions and Recommendations

• However, the rate of only slightly altered navicular bones and the common simultaneous changes in the joints of the toe make it challenging for a diagnosis to be made based only on x-ray findings.
• The researchers found that the changes visible in x-rays often evolve slowly, suggesting that examinations should be spaced at least a year apart.
• They also caution that, due to the complexity and variability of the disease, prognostic predictions should be made cautiously, even after multiple examinations.