Final answer:
A comminuted fracture is a medical term for a crushed bone with many fragments. It often requires open reduction surgery and goes through a multi-phase healing process involving callus formation and bone remodeling.
Step-by-step explanation:
The medical term for a crushed bone fracture with many fragments is comminuted fracture. In comminuted fractures, the bone breaks into several pieces, typically requiring more complex treatment such as open reduction to surgically expose and realign the fragments. After treatment, the healing process involves the formation of a hematoma, followed by the development of internal and external calli, where osteoclasts absorb dead bone and osteoblasts generate new bone. Over time, the calli unite, and bone remodeling ensures the return of the bone to its original shape and strength.