Infection and Biofilm in Orthoplastic Surgery

Rationale

Open fractures and complex limb injuries create an environment with
Devitalised tissue
Contamination
Impaired vascularity

These conditions promote bacterial adhesion and biofilm development, leading to persistent infection

Biofilm Concept

Biofilm is a structured community of bacteria embedded in a protective matrix attached to surfaces such as implants or necrotic tissue

Bacteria within biofilm are
Less metabolically active
Highly resistant to antibiotics
Protected from immune response

Pathophysiology

Initial contamination
Bacterial adhesion to surface
Biofilm formation
Chronic infection

Implants act as a surface for bacterial attachment and biofilm maturation

Common Pathogens

Staphylococcus aureus
Coagulase-negative staphylococci
Gram-negative organisms (especially in high-energy trauma)
Polymicrobial infections in contaminated wounds

Risk Factors

High-energy open fractures
Delayed debridement
Inadequate soft tissue coverage
Presence of implants
Poor host factors (diabetes, smoking, immunosuppression)

Clinical Presentation

Persistent wound drainage
Delayed healing
Local pain and swelling
Sinus tract formation
Systemic signs in acute infection

Diagnosis

Clinical assessment is essential

Laboratory findings
Elevated inflammatory markers

Imaging
X-ray for bone involvement
MRI for soft tissue and osteomyelitis

Microbiology
Deep tissue cultures (preferred over superficial swabs)

Orthoplastic Principles in Infection Control

Adequate debridement
Stable fixation
Early soft tissue coverage
Targeted antibiotic therapy

Treatment

1. Surgical Debridement

Removal of all infected and non-viable tissue
Essential step in breaking biofilm environment

2. Implant Management

Retain if stable and infection early
Remove if unstable or chronic infection present

3. Antibiotic Therapy

Empirical broad-spectrum initially
Adjusted according to culture results
Prolonged therapy often required

4. Soft Tissue Coverage

Well-vascularised tissue improves infection control
Muscle flaps are particularly effective

5. Staged Reconstruction

Often required in chronic infection
Includes debridement followed by reconstruction

Biofilm-Specific Considerations

Antibiotics alone are insufficient
Mechanical removal through debridement is essential
Biofilm can persist on implants and dead bone

Complications

Chronic osteomyelitis
Nonunion
Implant failure
Recurrent infection
Amputation

Prognosis

Depends on
Adequacy of debridement
Soft tissue management
Host factors

Early, aggressive orthoplastic management improves outcomes

Pits & Pearls

Biofilm explains why infections persist despite antibiotics
Debridement is the most important step in treatment
Muscle flaps improve local immune response
Early coverage reduces infection risk
Deep cultures are more reliable than superficial samples

Pitfalls

Relying on antibiotics alone
Incomplete debridement
Retaining infected implants without indication
Delayed soft tissue coverage
Misinterpreting superficial cultures

Mini Decision Algorithm

Concept Summary

Debridement is the key to breaking biofilm
Antibiotics support but do not replace surgery