Infection in Reconstruction Surgery

Definition

Infection occurring in the setting of orthopaedic reconstruction procedures, including:

• Fracture fixation

• Bone defect reconstruction

• Arthroplasty

• Orthoplastic surgery

Often complicated by:

• Implants

• Biofilm formation

Why It Matters

• Major cause of:

  • Reconstruction failure

  • Nonunion

  • Reoperation

Infection can compromise:

• Biology

• Mechanics

• Soft tissue envelope

Pathophysiology

Key Steps

1. Bacterial contamination

2. Adhesion to tissue or implant

3. Biofilm formation

4. Chronic infection

Biofilm Concept (Critical)

• Bacteria form a protective matrix

• Results in:

  • Antibiotic resistance

  • Immune evasion

Explains:

• Persistent infections despite treatment

Common Pathogens

• Staphylococcus aureus

• Coagulase-negative staphylococci

• Gram-negative organisms

• Polymicrobial infections (trauma cases)

Risk Factors

Patient Factors

• Diabetes

• Smoking

• Immunosuppression

• Malnutrition

Injury Factors

• Open fractures

• High-energy trauma

• Contamination

Surgical Factors

• Long operative time

• Poor soft tissue handling

• Implant use

Classification

By Timing

• Early (<2 weeks)

• Delayed (2–10 weeks)

• Late (>10 weeks)

By Depth

• Superficial

• Deep (bone / implant-related)

Clinical Presentation

• Pain

• Swelling

• Redness

• Persistent wound drainage

• Fever (in acute cases)

Diagnosis

Clinical

• Most important

Laboratory

• CRP

• ESR

• WBC

Imaging

• X-ray → bone changes

• MRI → soft tissue / osteomyelitis

Microbiology

• Deep tissue cultures (gold standard)

Treatment Principles

“Surgery + antibiotics” together

1. Surgical Management

Debridement

• Remove:

  • Necrotic tissue

  • Biofilm

• Most critical step

Implant Strategy

DAIR (Debridement, Antibiotics, Implant Retention)

• Early infection

• Stable implant

Implant Removal

• Chronic infection

• Unstable fixation

Dead Space Management

• Bone graft

• Cement spacer

• Masquelet technique

Soft Tissue Coverage

• Early flap coverage improves outcomes

2. Antibiotic Therapy

• Empirical → targeted

• Long-term therapy required

• Guided by cultures

Reconstruction Strategies After Infection

• Staged procedures

• Bone defect reconstruction

• Orthoplastic approach

Complications

• Chronic osteomyelitis

• Nonunion

• Implant failure

• Amputation

Prognosis

• Depends on:

  • Adequacy of debridement

  • Host factors

  • Soft tissue quality

Pits & Pearls

• Debridement is more important than antibiotics

• Biofilm cannot be eradicated with antibiotics alone

• Early soft tissue coverage improves infection control

• Stable fixation is essential for healing

Pitfalls

• Incomplete debridement

• Over-reliance on antibiotics

• Delayed reconstruction

• Ignoring host optimisation

Mini Decision Algorithm