Effects of exercise on chondrocyte viability and subchondral bone sclerosis in the distal third metacarpal and metatarsal bones of young horses.

This research investigates the impact of early exercise on the health of articular cartilage and subchondral bone in young Thoroughbred horses. The results indicate that controlled exercise may increase the number of viable chondrocytes and contribute to better development of articular cartilage.

Objective of the Study

• The main goal of this research was to understand how early exercise affects the health and development of articular cartilage and subchondral bone in certain areas of the distal third metacarpal and metatarsal bones in young Thoroughbred horses.

Methodology

• The study involved 12 young Thoroughbred horses, half of which were subjected to a controlled exercise routine 5 days per week starting at an average age of 21 days, while the remaining half were allowed to exercise at their leisure at pasture.
• The period of study lasted until the horses reached 17.1 months of age.
• The researchers used confocal laser scanning microscopy to count the number of viable and non-viable chondrocytes (cells in the cartilage).
• They also conducted proteoglycan and modified Mankin scoring, and used computed tomography to measure the subchondral bone mineral density.

Findings

• The results showed that the horses subjected to a controlled exercise routine had significantly more viable chondrocytes, indicated by a higher Safranin O/Fast Green (SOFG) score compared to the other group.
• No notable differences were observed in the mean bone mineral density between the two groups.
• The study found no correlation between subchondral bone mineral density and chondrocyte viability.

Implications

• The positive effects of early, controlled exercise seen in this study may point towards the implementation of exercise for optimising the development of articular cartilage in young horses.