Osteopenic bone disease leading to pathologic fractures

Concepts to consider:

What is the pathogenesis of osteopenic bone disease?
What are the components in a fracture callus?
How does a bone fracture heal?
What are the types of fracture?
What factors contributed to osteopenia in this goat?
Is there any other lesion that could be confused with fracture callus?
Why was this goat comatose?… hypocalcaemia?