Proximal suspensory desmopathy in hindlimbs: Magnetic resonance imaging, gross post-mortem and histological study.

This research study uses magnetic resonance imaging (MRI) to identify abnormalities in the suspensory ligament (SL) and surrounding tissues found in the hindlimbs of horses affected by proximal suspensory desmopathy (PSD). Using gross post-mortem and histological examination, the researchers cross-referenced the MRI findings to understand the common pathologies related to this disease.

Methodology

• The sample comprised 19 horses with PSD in their hindlimbs. These horses were euthanized to conduct a thorough post-mortem examination.
• MRI was used on 12 limbs of 11 horses. “High-field” refers to MRI machines using stronger magnets, providing highly detailed images.
• Examinations of gross pathology were carried out on all lame limbs while histological examinations were carried out on all SLs.
• A blind grading process was used to assess the MRI and histological images in order to avoid any bias.
• Using a numerical Bayesian approach, these observations were statistically analyzed. The aim was to ascertain the influence of each observation type on grades assigned for disease severity.

Results

• In two limbs, abnormalities were spotted in the collagenous tissue’s signal intensity when observed under MRI.
• Signal intensity abnormalities in muscle and adipose tissue were seen in 11 and 6 limbs, respectively.
• Adhesions of the SL and surrounding tissue were detected by MRI in eight cases but could only be confirmed in six of them during gross pathology.
• There was a high correlation between the study’s disease grading and histological findings of abnormally developed muscle tissue, which were present in all limbs.
• Grossly observable adhesions and nerve alterations were also determined to be strong indicators of the disease.
• Abnormal signal intensities in adipose tissue and loss of uniformity in muscle tissue signals within the SL were tied closely with disease severity based on MRI.

Conclusions

• The researchers acknowledged the small sample size and the assumption that all abnormalities were due to the same disease as potential limitations of the study.
• The study found that high-field MRI was reasonably accurate in detecting adhesion formations between SL and adjacent tissues.
• Pathologies in muscle and adipose tissues were identified either by themselves or in conjunction with collagenous tissue abnormalities.