Forelimb lameness associated with radiographic abnormalities of the cervical vertebrae.

This research investigated eight cases of forelimb lameness in horses, thought to be caused not by direct forelimb injury, but by irregularities in their cervical vertebrae (neck bones), as identified through radiography.

Research Purpose

• The study aimed to explore the association between forelimb lameness in horses and radiographic abnormalities in their cervical vertebrae. Forelimb lameness is any noticeable irregularity or difficulty in the horse’s gait or movements involving the front legs. The researchers hypothesized that some forelimb lameness is not directly due to forelimb pain, but is instead related to issues with the cervical vertebrae or neck bones.

Methods and Findings

• In total, eight horses showing signs of forelimb lameness were examined. None of these horses exhibited signs of ataxia (lack of voluntary coordination of muscle movements) or weakness, excluding these as potential causes of their lameness.
• For four horses, the team applied selective local analgesic techniques to eliminate the possibility of the lameness resulting from forelimb pain.
• In the remaining four horses, they conducted radiographic examinations of the cervical region based on observing forelimb lameness combined with neck stiffness and/or neck pain.
• They found radiographic abnormalities in the cervical vertebrae of all studied horses: three had significant remodelling of synovial articular facet joints in the lower neck region; one had remodelling plus a fracture between the 4th and 5th cervical vertebrae; one exhibited abnormalities between the 7th cervical and 1st thoracic vertebrae plus a distinct mineralised opacity above it; two had large empty spaces in a vertebral body; one had a fracture of the 7th cervical vertebra.

Conclusions and Outcome

• The study’s results supported the hypothesis that some situations of forelimb lameness in horses could be linked to abnormalities in the cervical vertebrae instead of primary forelimb injury. The range, character, and severity of lameness varied between the examined horses, aligning with the diversity of their cervical vertebrae abnormalities.
• Regarding outcomes for the horses, five were euthanized. Two horses recovered after a prolonged rest period. One was still resting at the time the research was published.