Final answer:
The step that comes after a hematoma in bone fracture repair is the formation of internal and external calli, which stabilize the fracture.
Step-by-step explanation:
After a hematoma forms in the repair of a bone fracture, the next step involves the formation of internal and external calli. Within about 48 hours after the fracture, chondrocytes from the endosteum create an internal callus by secreting a fibrocartilaginous matrix between the two ends of the broken bone. Concurrently, periosteal chondrocytes and osteoblasts create an external callus of hyaline cartilage and bone around the break. This step is crucial as it stabilizes the fracture and sets the stage for the subsequent bone healing processes.