Final answer:
Closed reduction is the process of aligning fractured bone fragments into their natural position without surgery. It is part of a suite of treatments for fractures, which are categorized by type and complexity. Healing involves the formation of a hematoma, calli development, and remodeling of new bone.
Step-by-step explanation:
Manipulating bone fracture fragments into alignment without incising the skin is called closed reduction. This manual manipulation of a broken bone sets it into its natural position without the need for surgery.
Fracture healing involves several biological processes starting with a hematoma formation, followed by the development of internal and external calli. These calli undergo a replacement by new bone as osteoblasts deposit new bone material where osteoclasts have resorbed the dead bone, leading to remodeling and complete healing of the fracture.
Different types of fractures such as transverse, oblique, spiral, comminuted, and greenstick require different treatment approaches. Closed reduction is suitable for less complicated fractures, whereas severe fractures might require an open reduction with surgery to properly align the bone fragments.