Ex vivo evaluation of carpal flexion after partial carpal arthrodesis in horses.

The research article explores the impact of partial carpal arthrodesis, a surgical procedure on the effects on wrist (carpal) joint flexion in horses. It discovers that while carpometacarpal (CMC) arthrodesis doesn’t affect carpal flexion, procedures involving the middle carpal (MC), and the antebrachiocarpal (ABC) joints result in significant reductions.

Methods

• The study employed an ex vivo design, that is, it was conducted on removed body parts (forelimbs from horses). The horses used were Quarter Horses, Thoroughbreds, and Paint Horses aged 2-10 years old.
• Partial carpal arthrodesis was performed using two locking compression plates. The tests included arthrodesis of just the CMC joint, a combination of MC and CMC joints (MC/CMC), and ABC joint.
• Once the arthrodesis was performed, cables and deadweights were attached to the limbs. The degrees of flexion were measured thrice using a protractor, and these measures were then averaged for accuracy.
• Control measurements, representing the natural state of carpal flexion, were obtained before and after the arthrodesis procedures.
• A Latin square design was used to randomize the techniques of arthrodesis among the sampled forelimbs.
• The analysis of this data was performed using Levene’s test, Q-Q plots, ANOVA, and the Bonferroni test.

Results

• The results showed that the CMC arthrodesis procedure had little to no effect on carpal flexion as compared to control measurements.
• In contrast, significant reductions in flexion were observed after both ABC and MC/CMC arthrodesis.
• Further, the ABC arthrodesis procedure resulted in the most pronounced reduction in carpal flexion when compared with the combined MC/CMC arthrodesis.

Conclusions

• The researchers concluded that CMC arthrodesis does not have a significant impact on carpal flexion in equine patients.
• However, arthrodesis procedures involving both CMC/MC and ABC joints substantially curtail the degree of carpal flexion. This information can be critical when selecting surgical methods in situations demanding maintenance of joint mobility in horses.