Biochemical development of subchondral bone from birth until age eleven months and the influence of physical activity.

This study explorers the biochemical development of subchondral bone, which supports articular cartilage, during the first eleven months of a horse’s life and the impact of physical activity on that development. Findings revealed significant fluctuations in water and hydroxylysine levels, calcium and collagen content, and crosslinking amounts during early stages of development, especially when physical activity was restricted, suggesting that natural development in bone composition may be vital to the future biomechanical challenges a horse will face.

Plain Language Overview

The study delves into how the subchondral bone, which provides stable structure to the cartilage in joints, forms and evolves from birth until eleven months of age in horses. The research also observes how physical activity can influence the biochemical components of these bones. The findings can potentially provide insights into the development or treatment of osteochondral diseases in horses.

Understanding The Research

This research paper addresses the following key aspects:

• The study focuses on analyzing the water content, calcium content, and features of the collagen network (including crosslinking) of the subchondral bone during different development stages.
• Sampled foals included animals from newborn to 5-month-old (both pasture-raised and box-confined) and 11-month-old.
• The results showed a significant decrease in water and hydroxylysine content, while an increase in calcium and collagen content and crosslinking during the first 5 months after birth.
• The importance of physical activity during early stages of development was made evident as restricted movement led to less increase in calcium content and both types of crosslink levels.
• From 5 to 11 months, most parameters remained constant except for water content, which decreased further.

Implications of The Findings

• The study concludes that significant changes occur during the early development months of biochemical composition of subchondral bone, mostly driven by exercise.
• The normal development of this bone is assumed to be crucial for it to adapt to the condition of loading, which is necessary for the horse to withstand future biomechanical challenges during its athletic career.
• The assumed importance of subchondral bone quality in the pathogenesis of osteochondral disease suggests that researchers need to study more about the role of the collagen network in subchondral bone.