What occurs as part of the inflammatory phase of fracture healing?

What occurs as part of the inflammatory phase of fracture healing?

• A. Formation of fibrocartilaginous callus
• B. Periosteal and endosteal cell proliferation
• C. Growth factor release
• D. Callus ossification

Answer: (C)

During the inflammatory phase of fracture healing, one of the primary processes that occurs is the release of growth factors. This phase begins shortly after the fracture happens and lasts for a few days, during which the body responds to the injury. The inflammatory response is characterized by the arrival of various cells to the fracture site, including platelets, macrophages, and neutrophils. Platelets that gather at the site release growth factors such as platelet-derived growth factor (PDGF) and transforming growth factor-beta (TGF-β), which are crucial for initiating the healing process. These growth factors play a key role in attracting other cells necessary for healing, such as mesenchymal stem cells and osteoprogenitor cells, which will eventually contribute to the regeneration of bone and connective tissue. The subsequent stages of healing, such as the formation of a fibrocartilaginous callus, occur after the inflammatory phase, focusing on the deposition of collagen and cartilage, and ultimately lead to ossification. Thus, growth factor release is a fundamental aspect of the inflammatory phase, setting the stage for subsequent healing processes.

During the inflammatory phase of fracture healing, one of the primary processes that occurs is the release of growth factors. This phase begins shortly after the fracture happens and lasts for a few days, during which the body responds to the injury. The inflammatory response is characterized by the arrival of various cells to the fracture site, including platelets, macrophages, and neutrophils.

Platelets that gather at the site release growth factors such as platelet-derived growth factor (PDGF) and transforming growth factor-beta (TGF-β), which are crucial for initiating the healing process. These growth factors play a key role in attracting other cells necessary for healing, such as mesenchymal stem cells and osteoprogenitor cells, which will eventually contribute to the regeneration of bone and connective tissue.

The subsequent stages of healing, such as the formation of a fibrocartilaginous callus, occur after the inflammatory phase, focusing on the deposition of collagen and cartilage, and ultimately lead to ossification. Thus, growth factor release is a fundamental aspect of the inflammatory phase, setting the stage for subsequent healing processes.