Final answer:
A fracture hematoma is organized into a tissue called the fibrocartilaginous callus, which consists of collagen fibers and cartilage, and eventually becomes a bony callus of trabecular bone as part of the bone healing process.
Step-by-step explanation:
The tissue that a fracture hematoma is organized into is called the fibrocartilaginous callus. This repair tissue forms between the broken bone ends during the healing process following a bone fracture.
When a bone fractures, blood vessels within the bone rupture, and blood begins to clot, forming a fracture hematoma. This is the initial response to the injury and disrupts blood flow to the bone, leading to bone cell death around the fracture site. Within a few days, the healing process initiates with capillaries growing into the hematoma and phagocytic cells clearing dead cells away. Fibroblasts and osteoblasts arrive in the area and start producing vital components for bone healing. Fibroblasts generate collagen fibers that connect the broken bone ends, while osteoblasts begin forming spongy bone. The combined efforts of these cells result in the formation of the fibrocartilaginous callus, which consists of both hyaline and fibrocartilage. Subsequently, this fibrocartilaginous callus eventually becomes converted into a bony callus made of trabecular bone.
Healing of bone fractures entails the initial formation of a hematoma, followed by the development of calli (internal and external), and then the replacement of cartilage within the calli by new bone tissue created by osteoblasts. The calli unite over time, and the area undergoes remodeling by osteoclasts and osteoblasts. This whole bone repair process can take many months, with the ultimate goal of restoring the bone to its original condition before the fracture.