Fractures and Bone Healing

A fracture is a break in the continuity of a bone, ranging from a hairline crack to a comminuted or open injury. From a nursing perspective, fracture care couples an understanding of how bone repairs itself with attention to pain, immobilization, neurovascular status, and the prevention of complications during healing and recovery.

Definition

A fracture is a partial or complete disruption of bone continuity, typically caused by trauma or by stress on bone weakened by disease, that heals through a coordinated biological sequence of inflammation, soft and hard callus formation, and remodeling.

Scope

This topic covers the classification of fractures, the biological phases of bone healing, fragility fractures and their link to osteoporosis, and the principal complications that orthopedic nursing assessment monitors for. It is a reference overview of how fractures and their healing are understood; it does not provide reduction techniques, dosing, or individualized treatment plans.

Core questions

• How are fractures classified by pattern, completeness, and skin integrity?
• What are the biological phases through which bone heals?
• Why are fragility fractures distinct from high-energy fractures?
• What complications of fractures and their immobilization require nursing surveillance?

Key concepts

• Fracture pattern and classification
• Open versus closed fracture
• Inflammatory, reparative, and remodeling phases
• Primary versus secondary bone healing
• Callus formation
• Fragility fracture
• Neurovascular assessment
• Delayed union and nonunion

Mechanisms

Bone healing classically proceeds through overlapping phases: an initial inflammatory response with hematoma formation, a reparative phase in which a soft (cartilaginous) callus is replaced by a hard (bony) callus, and a prolonged remodeling phase that restores bone architecture (Marsell & Einhorn, 2011). Healing can occur by secondary (callus-mediated) repair under relative stability or by primary (direct) repair under rigid fixation. The process is sensitive to mechanical stability, blood supply, and the systemic inflammatory environment, so disrupted healing can produce delayed union or nonunion (Claes et al., 2012). In fragility fractures, the underlying problem is reduced bone strength, so the same low-energy trauma that would not harm normal bone produces a break (Cummings & Melton, 2002; Compston et al., 2019).

Clinical relevance

Fractures are encountered across emergency, surgical, and rehabilitation settings, and hip and vertebral fragility fractures in particular are associated with substantial morbidity and loss of independence in older adults (Bhandari & Swiontkowski, 2017; Cummings & Melton, 2002). This entry explains how fractures heal and how their complications are categorized for nursing education; it is descriptive and not a basis for individual clinical management.

Epidemiology

Fragility fractures rise sharply with age and with osteoporosis, and hip fractures carry high rates of subsequent disability and excess mortality in the year after injury (Cummings & Melton, 2002; Bhandari & Swiontkowski, 2017). Osteoporosis underlies a large share of fractures in postmenopausal women and older men (Compston et al., 2019).

Evidence & guidelines

Care of common fractures, especially acute hip fracture in older adults, is supported by clinical reviews and guidelines emphasizing prompt surgical management, multidisciplinary care, and early mobilization (Bhandari & Swiontkowski, 2017). Secondary-fracture prevention is linked to osteoporosis management (Compston et al., 2019).

History

Understanding of fracture healing advanced from purely mechanical fixation toward an appreciation of the biology of callus formation and remodeling, while care has shifted from prolonged immobilization and bed rest toward early mobilization and fracture-liaison approaches to prevent further fragility fractures.

Seminal works

• marsell-claes-2011
• claes-2012
• cummings-melton-2002
• bhandari-2017

Frequently asked questions

What are the phases of fracture healing?

Healing generally moves through an inflammatory phase with hematoma formation, a reparative phase in which soft callus is converted to bony callus, and a long remodeling phase that restores normal bone architecture.

What makes a fracture a fragility fracture?

A fragility fracture results from low-energy trauma, such as a fall from standing height, that would not normally break healthy bone, signalling reduced bone strength as in osteoporosis.