Bone Fractures

Core Concepts

Bone basics that explain fractures

Bone is living tissue: the dense outer layer (cortical bone) gives strength, the spongy inner layer (cancellous bone) houses marrow, and the periosteum membrane carries the blood vessels that feed it. Bone constantly remodels — old bone resorbed, new bone laid down — which is why broken bone can heal completely and why disease-weakened bone (osteoporosis, tumor) breaks more easily.

Classifying fractures

Classification is the language of fracture care. Key axes:

• Skin integrity: Closed (simple) — skin intact. Open (compound) — the skin is broken over the fracture site, which may or may not show bone. Open fractures are at high risk for infection and are treated urgently.
• Completeness: Complete — the bone is fully divided. Incomplete — the break does not go all the way through (e.g., greenstick fracture, where one side of a child's softer bone bends and the other cracks, like a green twig).
• Pattern of the break line: transverse (straight across), oblique (diagonal), spiral (twisted, often from a twisting injury), comminuted (bone shattered into three or more pieces), impacted (fragments driven into each other), compression (bone crushed, typically vertebral bodies).
• Cause: traumatic (a blow or force), pathologic (bone weakened by disease — tumor, severe osteoporosis — breaks under normal or minor stress), stress/fatigue (repeated small loads, common in athletes and military recruits).

How fractures happen

Fractures occur when the force applied to a bone exceeds its strength. A direct blow (a car bumper hitting the tibia), an indirect force (falling on an outstretched hand fracturing the wrist or shoulder), a twisting force (producing a spiral fracture of the tibia or ankle), compression (landing on the heels and compressing a vertebral body), and repetitive stress (running overuse causing a metatarsal stress fracture) are the common mechanisms. The mechanism often predicts the fracture type — and raises suspicion for abuse or other injuries when the story doesn't fit.

How bone heals: the four stages

1. Hematoma formation — bleeding at the fracture site forms a clot, the first scaffold for repair.
2. Inflammation — immune cells arrive, debris is cleared, and new blood vessels grow (days).
3. Soft callus → hard callus — cells lay down fibrocartilage that bridges the gap, then replace it with woven (immature) bone. This is the stage where the "knitting" becomes visible on X-ray (weeks).
4. Remodeling — over months to years, the body reshapes the callus into strong lamellar bone aligned with the stresses on the bone.

Healing is faster in children, slower in older adults. Factors that impair healing: poor blood supply to the fractured area, smoking, malnutrition, infection, inadequate immobilization, and comorbidities such as diabetes. Alignment and stability during healing are everything — which is why casts, traction, and surgical fixation exist.

Clinical manifestations

Pain (often severe, worse with movement or weight bearing), swelling, deformity or abnormal angulation, loss of function, ecchymosis that develops over time, and crepitus — a grating sensation from bone ends rubbing. Always assess neurovascular status distal to the fracture (pulses, sensation, motor function, capillary refill), because fragments can injure nearby nerves and vessels. In open fractures, cover the wound promptly.

Management

• First aid: splint the limb in the position found (do not attempt to realign), cover open wounds with sterile dressings, apply ice and elevation, and manage pain. Splinting prevents further soft tissue damage and reduces pain.
• Definitive treatment: closed reduction (the provider aligns the fragments without surgery) followed by immobilization with a cast or splint; traction (temporary realignment, e.g., for some femur fractures); or surgery — open reduction internal fixation (ORIF) with plates, screws, or rods, or an external fixator (a frame outside the limb holding pins in the bone), often used for open fractures with severe soft tissue injury.
• Open fractures: treated urgently — wound cleansing, antibiotics and tetanus prophylaxis as ordered by the provider, and stabilization to prevent infection.
• Pain management: per provider orders, with reassessment.

Complications to know cold

• Compartment syndrome — the classic nursing emergency. Bleeding and swelling raise pressure inside a closed fascial compartment of the limb, squeezing muscles, nerves, and vessels. Early warning signs: pain out of proportion to the injury, pain on passive stretch of the muscles, and later paresthesia (numbness/tingling), pallor, paralysis — and pulselessness is a LATE sign, not an early one. Treatment: remove or split the constricting cast/dressing immediately and notify the provider; surgical fasciotomy may be needed to open the compartment. Every minute of delay risks permanent muscle and nerve damage.
• Fat embolism syndrome — fat globules from the marrow of a fractured long bone or pelvis enter the bloodstream, classically 1–3 days after injury, causing respiratory distress, confusion, and a petechial rash. Sudden hypoxia or confusion in a patient with a long-bone fracture is an escalation cue.
• Venous thromboembolism (DVT/PE) — immobility after fracture raises risk; prevention measures are typically ordered.
• Infection/osteomyelitis — especially with open fractures.
• Healing problems: delayed union (healing slower than expected), nonunion (healing stops), malunion (heals in a poor position).
• Nerve or vascular injury at the fracture site.

Nursing care across the fracture journey

• Neurovascular checks (CMS: circulation, motion, sensation) distal to the injury — color, warmth, capillary refill, pulses, sensation, and movement — documented at regular intervals, with any change reported immediately. This is the single most important nursing safeguard.
• Cast and splint care: keep the cast dry, elevate the limb, apply ice (never directly on the cast without protection), watch for pain, odor, warmth, or drainage, and teach the patient what to report (numbness, color change, severe pain, inability to move fingers/toes).
• Traction care: maintain alignment, keep weights hanging free, and assess skin and neurovascular status.
• Pain and mobility: assess pain, administer medications as ordered, assist with safe transfers, and teach crutch or walker use.
• Prevention: early mobilization as allowed, DVT prevention per orders, and skin care under devices.
• Patient education: the healing timeline, why immobilization is non-negotiable, warning signs to report, and nutrition (adequate protein, calcium, vitamin D) as appropriate.

Diagnosis, reduction, and surgical decisions are made by the provider; nurses assess, immobilize, monitor, teach, and report. Institutional protocols and scope of practice vary.

Common Confusions