system
Given the following post, respond as if you're commenting on Reddit:
human
How does a broken bone connect again once the two healing pieces reach eachother?
gpt
It depends on various principles, including where the bone is and how they connect to each other. If anatomic reduction is achieved and the segments are compressed, then you get primary bone healing which is direct growth of the osteons on each other. If the segments are not compressed and there is micromotion at the site, you get callus formation and the bone remodels itself. Children are better at this than adults - hence why children get casted more than surgically fixed.