PATHOLOGY

Detailed explanation-1: -Overriding– A displaced fracture where the bone fragments overlap. Impacted– Occurs when the broken ends of the bone are jammed together by the force of the injury.

Detailed explanation-2: -Fractures heal by forming callus, which follows three overlapping phases: inflammatory, reparative and remodelling.

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: -Hematoma Formation (Days 1 to 5) Fibrocartilaginous Callus Formation (Days 5 to 11) Bony Callus Formation (Days 11 to 28) Bone Remodelling (Day 18 onwards, lasting months to years)