MICROANATOMY

Detailed explanation-1: -This stage begins immediately following the fracture. The blood vessels supplying the bone and periosteum are ruptured during the fracture, causing a hematoma to form around the fracture site. The hematoma clots and forms the temporary frame for subsequent healing.

Detailed explanation-2: -Stage 1: Immediately following trauma, the first stage of fracture healing is blood clotting (haematoma formation) and inflammation, which begin within the fracture site. Stage 2: Repair phase, the granulation tissue is replaced by soft (cartilaginous) and then hard callus of woven bone at the fracture site.

Detailed explanation-3: -There are four stages in the repair of a broken bone: 1) the formation of hematoma at the break, 2) the formation of a fibrocartilaginous callus, 3) the formation of a bony callus, and 4) remodeling and addition of compact bone.

Detailed explanation-4: -Following a fracture, a hematoma forms which provides the building blocks for healing. Subsequently, reabsorption occurs of the 1 to 2 mm of bone at the fracture edges that have lost their blood supply. It is this bone reabsorption that makes fracture lines become radiographically distinct 5 to 10 days after injury.