Magnetic resonance imaging findings in the carpus and proximal metacarpal region of 50 lame horses.

This research aims to detail the findings of magnetic resonance imaging (MRI) scans on lame horses focusing on their carpus (wrist) and proximal metacarpal (upper limb bone) region. The study features an analysis of clinical records from the Animal Health Trust, evaluation of any available images from different diagnostic techniques, and comparison with MRI findings.

Methodology

• The researchers reviewed clinical records of horses that underwent MRI scans between the specified period of January 2003 and September 2010 at the Animal Health Trust. The focus was on the carpus (wrist) and proximal metacarpal region of the horses.
• Apart from MRI scans, the study also assessed any available diagnostic images from other techniques like radiographs, ultrasounds, and scintigraphy, which were compared and related with MRI findings wherever possible.

Results

• A total of 72 MR studies were reviewed which involved 58 lame limbs in 50 horses from various work disciplines and ages.
• The most common primary abnormality found was a decreased signal intensity in T1- and T2-weighted images in the medial (inner) aspect of the carpal bones and/or the proximomedial (near the median plane) aspect of the metacarpal bones.
• Nine horses showed syndesmopathy (a disease of the ligaments that join bones) between the second and third metacarpal bones.
• Six horses had primary abnormalities identified in the palmar cortex of the third metacarpal bone (McIII), the back part of the upper limb bone.
• Significant abnormalities of the suspensory ligament (SL) (that aids in supporting the horse’s leg) with associated lesions in the adjacent palmar cortex of the McIII were seen in four limbs.
• Four limbs showed ligament and associated bone abnormalities between the second and third carpal bones and second and third metacarpal bones.

Conclusions

• The study concluded that MRI enabled the diagnosis of various lesions in horses which were not detected by conventional imaging techniques, irrespective of their work disciplines.
• It was also observed that the distribution of injury types was considerably different from previous studies, indicating potential changes in patterns of common injuries in horses over time.