Laminitis in donkeys: a pilot study investigating radiographic versus post-mortem measurements

Citation

Abigail Sefton. 2 September 2019. Laminitis in donkeys: a pilot study investigating radiographic versus post-mortem measurements. Equine Veterinary Journal. 51:S53. 10.

Authors
Publication details
Publication date: 
2 September 2019
Volume: 
51
Issue: 
S53
Page numbers: 
10
DOI number: 
10.1111/evj.10_13152
Abstract

Background:

Laminitis is a painful disease of equines. Radiographic and post-mortem evaluations of feet are often an important part of welfare investigations, and professional opinions by veterinarians are necessary in resulting legal cases. Any difference in measurements between the two modalities can cause uncertainty, potentially affecting
the legal decision.

Objectives:

To quantify the difference between radiographic and postmortem pre-mortem vs. post-mortem effects.

Study design: Case series.

Methods: Seven donkeys with laminitis confirmed via standard workup, euthanased for reasons unrelated to the study, were selected. Weight-bearing and non-weight-bearing lateral radiographs were taken of both front feet within 24 h pre-mortem. Feet were removed and sagitally sectioned between 48 and 72 h post-mortem. Lateral radiographs were taken of the feet immediately following sectioning. Founder distance and rotation were evaluated at each time point and compared using paired t-tests (P < 0.05).

Results:

Compared with pre-mortem weight-bearing radiographs, nonweight-bearing feet had a decreased founder distance and decreased rotation. Compared with pre-mortem non-weight- bearing radiographs, post-mortem feet had increased rotation and no change in founder distance. There were no significant differences between post-mortem direct measurements and post- mortem radiographs. Compared with standard weight-bearing radiographs, post-mortem measurements had a decreased founder distance and increased rotation.

Main limitations: Small sample size. Further samples are needed to confirm these initial conclusions.

Conclusions:

Measurements of post-mortem feet have a decreased founder distance and an increased rotation compared with standard radiographic images. Changes in founder distance are seen due to changes in weight-bearing. Changes in rotation are seen post-mortem, and can be explained by autolysis of the laminae and/or rigor mortis
causing tendon contracture. Most studies have focused on indications and severity of laminitis in living animals using radiographs: postmortem measurements should therefore be interpreted with caution.

Competing interests:

None declared.

Ethical animal research:

Approved by The Donkey Sanctuary.

Donkeys were owned by The Donkey Sanctuary and were used with consent.

Sources of funding:

The Donkey Sanctuary.

Online references