Final answer:
A fracture with multiple bone fragments is called a comminuted fracture. Healing involves a multistep process beginning with a hematoma and includes the formation of calli and bone remodeling.
Step-by-step explanation:
When multiple bone fragments are present due to a fracture, it is known as a comminuted fracture. This type of fracture involves several breaks, resulting in many small pieces between two large segments. Other common types of fractures also include transverse, oblique, spiral, impacted, greenstick, open (compound), and closed (simple). Healing of a fracture begins with the formation of a hematoma, with further steps involving the actions of osteoclasts and osteoblasts, and eventually leads to the union and remodeling of the calli.