Influence of wound shape on wound contraction in horses.

This study investigates how the shape of a wound can influence its contraction and therefore, the wound healing process in horses. The findings suggest that though the shape of the wound doesn’t impact the healing rate, it does influence the maximal size that wounds can attain during healing.

Objective and Methodology

• The study was aimed at exploring whether the shape of a wound has a bearing on wound contraction, a key factor in wound healing, in horses.
• Three paired sets of square and circular full-thickness skin wounds were made on the metacarpus (the upper part of the horse’s forelimb) of eight horses, resulting in a total of 48 wounds.
• Each wound was of the same area, a total of 6.25 cm2.
• All wounds were treated topically with an ointment, non-adherent dressing, and were bandaged with a secure elastic wrap.
• To observe healing progress, wounds were photographed every other day until complete recovery.

Measurements and Analysis

• Several wound healing variables were tracked for each wound: time taken for healing, the largest size achieved during healing, healing speed (tracked using first-order and linear models), final size of the wound, and the percentage of the wound that healed via contraction.
• Healing data was fitted into exponential and linear healing models.
• The research found that the exponential model was a significantly better fit for the data as compared to the linear model, indicating wound healing is closer to an exponential process in horses.

Findings

• The main finding of the study was that the maximum size achieved by wounds during healing was significantly influenced by the shape of the wound. The circular wounds reached a smaller size than the square wounds.
• The study also concluded that the rate of wound healing was not affected by the shape of the wound, and conversion of circular defects to square defects could not improve the speed of wound healing.

Conclusion

• Based on this research, the assumption that changing the shape of the wound from circular to square could speed up wound healing has been debunked.
• However, the shape does have an effect on the maximum size the wound can reach during the healing process, with circular wounds being smaller in size as compared to square wounds.