Orthopaedic Surgery - Open Fractures

Basics

An open fracture is a fracture in which the fracture site communicates with the external environment through a full-thickness wound.

The fractured bone does not need to protrude through the skin.

Any full-thickness laceration located within the zone of injury should be assumed to communicate with the fracture until proven otherwise.

Open fractures are important because disruption of the skin and soft-tissue envelope exposes the fracture to:

Bacterial contamination

Soft-tissue devitalization

Bone devascularization

and an increased risk of:

Infection, delayed union, and nonunion.

Gustilo–Anderson Classification

Open fractures are commonly classified using the Gustilo–Anderson system.

The classification is based on:

Energy of injury

Wound size

Degree of contamination

Soft-tissue damage

Adequacy of coverage

Presence of vascular injury

Final classification is often most accurate after operative débridement.

Type I

A Type I injury is generally:

Low energy

with a:

Clean wound less than 1 cm in length.

Soft-tissue damage is limited.

Type II

A Type II open fracture typically involves:

Low- to moderate-energy trauma

with a:

Wound greater than 1 cm

but without extensive:

Soft-tissue stripping, crushing, or devitalization.

Type III

Type III injuries are more severe and generally result from:

High-energy trauma

or involve:

Extensive soft-tissue destruction

Marked contamination

Segmental fractures

High-energy penetrating injuries

They are subdivided according to soft-tissue coverage and vascular injury.

Type IIIA

There is substantial soft-tissue injury, but:

Adequate viable tissue remains to cover the bone.

Type IIIB

There is:

Extensive soft-tissue loss, periosteal stripping, and exposed bone

such that satisfactory coverage cannot be achieved without:

Rotational flap

or

Free-tissue transfer.

Type IIIC

A Type IIIC injury is an open fracture associated with an:

Arterial injury requiring repair, regardless of wound size.

Risk Factors

Bones with a thin soft-tissue envelope are more likely to become exposed after fracture.

The classic example is the:

Tibia.

By contrast, the femur is surrounded by a much thicker soft-tissue envelope and is less likely to present as an open fracture after an equivalent degree of injury.

Pathophysiology

The major principles of treatment are to:

Prevent infection

Remove devitalized tissue

Provide skeletal stability

Restore viable soft-tissue coverage

Infection is promoted by:

Bacterial contamination

Necrotic muscle

Devitalized bone

Dead space

Retained foreign material

Poor vascular supply

Associated Conditions

Open fractures frequently occur in the setting of:

High-energy trauma and multiple injuries.

Initial management should therefore follow ATLS principles, with attention to immediately life-threatening injuries before definitive limb reconstruction.

Associated Injury Assessment

The entire patient should be examined.

Particular attention should be given to:

The spine

Adjacent joints

Other extremities

Chest

Abdomen

Pelvis

An obvious open fracture should not distract from other major injuries.

Diagnosis

Signs and Symptoms

Open fractures may follow either:

High-energy

or

Low-energy mechanisms.

The defining feature is communication between the fracture and an external wound.

History

Important questions include:

When did the injury occur?

What was the mechanism?

Was it high or low energy?

Was the wound exposed to soil or barnyard contamination?

Was there freshwater or marine contamination?

Was the wound exposed to oil, grease, or industrial material?

These details influence contamination risk and antibiotic selection.

Physical Examination

The examination has two major objectives:

Recognize the injury as an open fracture

and

Assess the overall fracture, limb, and patient.

Findings Suggesting an Open Fracture

Potential signs include:

Bone protruding from the skin

Fat, marrow, or blood emerging from a wound

A laceration directly over or near the fracture

Large soft-tissue wounds in the zone of injury

Visible bone is not required.

General Fracture Examination

Examine:

The joint above

The joint below

and other potentially injured regions.

Vascular Assessment

Evaluate limb perfusion by assessing:

Palpable pulses

Capillary refill

Skin color

Temperature

Doppler signals when necessary

Ankle-brachial or arterial pressure indices when appropriate

A pulseless or poorly perfused limb requires urgent vascular assessment.

Soft-Tissue Assessment

Assess:

Skin viability

Muscle viability

Contusion

Crush injury

Periosteal stripping

Foreign material

Gross contamination

Soft-tissue loss

Repeated manipulation of the wound should be minimized.

Neurologic Examination

Document motor and sensory function distal to the injury before and after:

Reduction, splinting, and surgery.

Compartment Syndrome

Open fractures do not protect against compartment syndrome.

Suspicion should remain high when there is:

Increasing pain

Pain with passive stretch

Tense compartments

Progressive neurologic deficit

Unexplained swelling

Laboratory Tests

Because most open fractures require operative treatment, appropriate preoperative laboratory studies are usually obtained.

These may include:

CBC

Electrolytes

Renal function

Coagulation studies

Blood type and screen

according to injury severity and anticipated surgery.

Imaging

Radiographs should be tailored to the fracture location.

Standard imaging generally includes:

AP and lateral views of the injured bone

with adequate visualization of:

The joint above and the joint below.

CT

CT may be useful for:

Articular fractures

Complex fracture patterns

Pelvic or periarticular injury

However, CT should not unnecessarily delay:

Urgent antibiotics, débridement, vascular treatment, or stabilization.

Compartment Pressure Monitoring

If the patient cannot be examined reliably or if there is substantial swelling and concern for compartment syndrome, compartment pressures may be measured.

Clinical examination remains central whenever it is reliable.

Differential Diagnosis

Occasionally, a laceration may coexist with a fracture without communicating with it.

However, the safest approach is:

Assume that any full-thickness wound within the fracture zone represents an open fracture until proven otherwise.

Treatment

Initial Stabilization

After life-threatening injuries have been addressed according to trauma principles:

Cover the wound with a sterile dressing

Splint the extremity

Administer intravenous antibiotics promptly

Provide tetanus prophylaxis when indicated

Perform and document neurovascular examination

Unnecessary repeated removal of the dressing should be avoided.

General Treatment Goals

The primary objectives are to:

Prevent infection

Remove devitalized tissue and contamination

Restore alignment and stability

Achieve durable soft-tissue coverage

Preserve limb function

Antibiotics

Early intravenous antibiotic administration is one of the most important interventions.

Antibiotics should be given:

As soon as possible after presentation, rather than waiting for the operating room.

Antibiotic Selection

Historically, treatment included:

A first-generation cephalosporin for lower-grade open fractures

with additional gram-negative coverage for severe Type III injuries.

Current antibiotic protocols vary by institution and local resistance patterns.

Typical regimens provide:

Gram-positive coverage for all open fractures

with broader coverage considered for:

Type III injuries

Gross contamination

Water exposure

Farm injuries

Heavy soil contamination

Penicillin or Anaerobic Coverage

Additional anaerobic coverage may be considered in wounds contaminated by:

Farm soil

Fecal material

Extensive devitalized tissue

or other situations with high risk of clostridial contamination.

Special Contamination

Antibiotic selection may need modification for:

Freshwater exposure

Marine exposure

Industrial contamination

Known resistant organisms

Duration of Antibiotic Therapy

Prophylactic antibiotics are generally continued for a limited period after definitive débridement and closure.

The exact duration depends on:

Fracture severity

Wound closure timing

Institutional protocol

Prolonged prophylaxis without infection is generally avoided.

If established infection develops, treatment becomes:

Culture-directed therapeutic antibiotic management.

Pain Control

Pain may be treated with:

Acetaminophen

Opioids when necessary

and other appropriate analgesics.

Pain control should not interfere with repeated assessment for:

Compartment syndrome or neurologic deterioration.

Tetanus Prophylaxis

Tetanus immunization status should be reviewed.

Patients may require:

Tetanus booster

and, in selected inadequately immunized patients,

Tetanus immune globulin.

Surgery

Most open fractures require operative treatment.

The central surgical principle is:

Meticulous irrigation and débridement.

Débridement

The goal is to leave:

Viable tissue, minimal contamination, adequate perfusion, and a clean wound suitable for reconstruction.

Skin and Subcutaneous Tissue

Nonviable skin and subcutaneous tissue should be excised back to:

Healthy, bleeding tissue.

Muscle Viability

Muscle viability is traditionally assessed according to:

Color

Consistency

Contractility

Capacity to bleed

Nonviable muscle should be removed.

Bone Débridement

Loose cortical fragments that have:

No soft-tissue attachment and no viable blood supply

may require removal.

However, viable bone should be preserved whenever possible.

Irrigation

Copious irrigation is used to:

Reduce bacterial contamination

Remove debris

Clear foreign material

Normal saline is commonly used.

Older teaching recommended fixed volumes such as 6–10 L, but current practice generally tailors irrigation volume to:

Wound size, contamination, and tissue damage.

Timing of Débridement

The historical rigid “6-hour rule” is no longer considered mandatory for every open fracture.

Urgency depends on:

Gross contamination

Vascular injury

Compartment syndrome

Severe soft-tissue compromise

Overall patient condition

Débridement should nevertheless occur promptly and should not be unnecessarily delayed.

Repeat Débridement

Severely contaminated or questionable wounds may require:

Repeat operative débridement within approximately 24–48 hours.

This allows reassessment of tissue viability before definitive closure.

Wound Closure

The timing of closure depends on:

Cleanliness of the wound

Tissue viability

Contamination

Ability to achieve tension-free coverage

Primary Closure

Many Type I and selected Type II wounds can be:

Closed primarily after adequate débridement

when the tissue is viable and contamination is controlled.

Delayed Closure

More severe wounds may require:

Delayed primary closure

after repeat evaluation or débridement.

Soft-Tissue Reconstruction

Large wounds with exposed bone or implants may require plastic surgical reconstruction using:

Local rotational flaps

Muscle flaps

Free-tissue transfer

Early durable coverage is important for both:

Infection control and fracture healing.

Fracture Stabilization

Stable fixation reduces:

Pain

Soft-tissue injury

Dead space

Continued contamination

and facilitates:

Wound care and rehabilitation.

Implant Selection

The fixation method depends on:

Fracture location

Soft-tissue condition

Contamination

Fracture severity

Options include:

External fixation

Intramedullary nailing

Plate-and-screw fixation

External Fixation

Temporary external fixation is useful when there is:

Severe soft-tissue injury

Major contamination

Polytrauma

Vascular repair

Need for staged reconstruction

Definitive Fixation

After the soft tissues and overall condition permit, definitive stabilization may involve:

Intramedullary nailing

Plate fixation

Definitive external fixation

depending on the fracture.

Activity

Weight-bearing and activity restrictions depend on:

Fracture stability

Fixation method

Soft-tissue healing

Associated injuries

Nursing Care

The injured extremity is commonly elevated when appropriate to help control:

Swelling and discomfort.

Care must be taken not to compromise:

Perfusion or wound monitoring.

Physical Therapy

Rehabilitation is individualized.

Goals include:

Maintaining joint range of motion

Restoring strength

Preventing stiffness

Progressing weight bearing safely

Early motion is encouraged when fracture and soft-tissue stability allow.

Follow-Up

Follow-up depends on:

Gustilo type

Fracture location

Soft-tissue reconstruction

Presence of infection

Method of fixation

Wound Monitoring

The wound should be assessed for:

Increasing erythema

Drainage

Persistent swelling

Necrosis

Wound dehiscence

Fever or systemic symptoms

Referral

All open fractures require:

Prompt orthopaedic evaluation.

In complex injuries, additional consultation may be required from:

Plastic surgery

Vascular surgery

Trauma surgery

Infectious disease

Prognosis

Outcome depends heavily on:

Severity of soft-tissue injury

Degree of contamination

Vascular status

Fracture pattern

Presence of infection

Patient comorbidities

Infection Risk

Historical infection rates increase markedly with injury severity.

Approximate older ranges include:

Type I: around 2%

Type II: approximately 2–10%

Type III: approximately 10–50%, depending on subtype, contamination, and location.

Modern treatment may produce lower rates in many settings, but Type III injuries remain at substantially greater risk.

Osteomyelitis

Deep infection may progress to:

Chronic osteomyelitis

with:

Persistent drainage

Bone destruction

Hardware failure

Nonunion

Treatment may require repeated débridement and prolonged culture-directed antibiotics.

Nonunion

The risk of nonunion rises with:

Periosteal stripping

Bone loss

Infection

Mechanical instability

Poor vascularity

Malunion

If alignment is not restored and maintained, the fracture may heal with:

Angular

Rotational

or

Length deformity.

Post-Traumatic Arthritis

Open fractures involving a joint may later produce:

Post-traumatic arthritis, particularly when the articular surface is severely damaged.

Other Complications

Additional complications include:

Compartment syndrome

Vascular compromise

Nerve injury

Hardware failure

Soft-tissue necrosis

Chronic pain

Limb-length discrepancy

Amputation in severe cases

Key Principle

An open fracture should be regarded as both:

A fracture

and

A contaminated soft-tissue injury.

Successful treatment depends on:

Early antibiotics, tetanus prophylaxis, careful sterile wound management, thorough débridement, stable skeletal fixation, restoration of viable soft-tissue coverage, and close surveillance for infection and nonunion.