Open Fractures: Classification, Clinical Picture, Diagnostics, and Principles of Treatment

Definition

1. Classification

Gustilo-Anderson Classification (most widely used worldwide)

OTA Open Fracture Classification (OTA-OFC, 2018)

Tscherne-Gotzen Classification for Open Fractures

• Grade 1: Skin laceration caused by bone from inside, little contusion
• Grade 2: Any laceration with circumscribed contusion and moderate contamination
• Grade 3: Severe soft-tissue damage, often with vascular/nerve injury, ischemia, compartment syndrome, or severe comminution
• Grade 4: Subtotal/total amputation; all major anatomical structures separated; remaining soft tissue ≤1/4 of extremity circumference

2. Clinical Picture

History

• Mechanism is key: low-energy (fall, minor blunt trauma) vs. high-energy (motor vehicle collision, blast, gunshot, agricultural machinery)
• Time since injury (ischemia tolerance: muscle 6-8 hours, nerve less)
• Tetanus immunisation status
• Comorbidities (diabetes, peripheral vascular disease, immunosuppression)

Examination Findings

• Visible wound communicating with the fracture site - may be small puncture (from inside-out bone spike in low-energy injuries) or large traumatic laceration
• Deformity, swelling, crepitus, abnormal mobility at the fracture site
• Contamination: dirt, organic material, clothing fibres, glass
• Vascular assessment: bleeding (pulsatile = arterial), pallor, absent pulses, prolonged capillary refill, cool limb - the 5 Ps: Pain, Pallor, Pulselessness, Paresthesia, Paralysis
• Neurological assessment: sensory and motor function distal to the injury (document before any anaesthesia/sedation)
• Ankle-brachial pressure index (ABPI): value <0.9 in normotensive patients suggests significant arterial compromise
• Compartment syndrome signs: tense swelling, severe pain especially with passive stretch; must be assessed urgently
• Signs of non-viable skin (in degloving): thrombosis of subcutaneous veins, fixed staining, non-blanching on pressure

3. Diagnostics

Imaging

• Plain radiographs (minimum 2 views): mandatory for all suspected fractures; define fracture pattern, comminution, bone loss, and foreign bodies. An AP pelvis X-ray is essential in polytrauma
• CT scan with 3D reconstruction: for complex periarticular fractures, pelvis, spine; defines fracture geometry for surgical planning
• CT angiography: preferred over formal angiography for suspected vascular injury (ABPI <0.9, absent pulses, expanding haematoma, audible bruit). Avoids delay of separate preoperative angiography
• Doppler ultrasound: rapid bedside screening for vascular status

Laboratory

• Full blood count, coagulation, cross-match for haemorrhage control
• Blood cultures if signs of systemic sepsis
• Wound swabs: bacterial cultures taken at debridement (pre-op swabs have poor correlation with late infective organisms and are not routinely recommended)

Wound Assessment

• Initial assessment in the emergency department with sterile dressings applied promptly - repeated wound inspection before theatre is avoided to reduce contamination
• Photographic documentation before debridement
• Intraoperative assessment of soft tissue viability using the 4 Cs for muscle: Color, Consistency, Contractility, Capacity to bleed

4. Principles of Treatment

Pre-hospital and Emergency Department

1. Control haemorrhage: direct pressure; tourniquet used sparingly (risk of nerve/limb damage) but essential when life-threatening haemorrhage present
2. Sterile dressing: cover wound immediately; minimise re-examination before theatre
3. Splinting: restore length and alignment; reduces pain, protects vascularity, prevents further soft-tissue damage
4. IV antibiotics - start as soon as possible (within 1-3 hours of injury):
   • All authors recommend administration within 3 hours; many recommend immediately on ED presentation
   • Type I/II: gram-positive coverage - cefazolin 1-2 g IV every 8 hours
   • Type III: add gram-negative coverage - gentamicin (weight-adjusted) or cefazolin + aminoglycoside; avoid fluoroquinolones (adverse effect on bone healing)
   • Farm/organic contamination: add penicillin (10-12 million units daily) for anaerobic/clostridial coverage
   • Duration: continue until 24 hours after wound closure (not prolonged courses)
   • Surgical Infection Society 2022 guidelines recommend against broad-spectrum coverage beyond gram-positive organisms even for Type III, unless bone loss is present (use local + systemic antibiotics in that case)
5. Tetanus prophylaxis: immunisation update as indicated
6. ATLS primary survey in polytrauma: airway - breathing - circulation priority before limb assessment

Surgical Treatment

Timing of Debridement

• The old "6-hour rule" is no longer absolute - current evidence shows no significant increase in infection risk with debridement up to 24 hours after injury for uncontaminated fractures
• Immediate (emergent) debridement is indicated for:
  • Contaminated wounds
  • Suspected associated vascular injury
  • Compartment syndrome
  • Multiple injuries/polytrauma
• Within 12 hours: uncontaminated high-energy injuries (types IIIA and IIIB)
• Within 24 hours: low-energy, uncontaminated open fractures
• Note: risk of infection increases by ~3% per hour in Type III tibial fractures with delayed debridement

Debridement (Wound Excision) Technique

• Senior surgeon involvement; orthoplastic team ideally present
• Skin/fascia: extend wounds longitudinally; trim margins to bleeding dermis; excise all avascular fascia
• Muscle: assess and excise by 4 Cs; all compartments evaluated
• Bone: inspect ends and medullary cavity; excise all fragments without soft-tissue attachment (devascularised bone)
• Lavage: after excision (not before, to avoid driving contamination deeper); low-pressure saline irrigation (the FLOW study showed no benefit to high-pressure pulsed lavage and higher reoperation rates; low-pressure preferred)
• Volume of irrigation: sufficient until fluid runs clear (typically 3-9 litres depending on grade)

Fracture Stabilisation

Wound Closure and Soft-Tissue Coverage

• Primary closure: for Grade I and selected Grade II wounds with clean, non-contaminated wounds
• Delayed primary closure (24-72 hours): for higher grades; preferred over serial re-debridements
• Split-thickness skin grafting: for defects once the fracture site is covered by viable tissue
• Flap coverage (free or rotational): required for Grade IIIB with bone/implant exposure; plastic surgery involvement is mandatory; should be performed within 72 hours when possible to reduce infection risk
• Negative pressure wound therapy (NPWT/VAC): useful as a temporary bridge; aids skin graft take; but evidence shows no decrease in infection rate in lower limb fractures when used instead of early definitive coverage

Vascular Injury (Grade IIIC)

• Revascularisation ideally within 3-4 hours of injury
• CT angiography guides planning; separate preoperative angiography avoided to save time
• Temporary vascular shunting can be used while fracture stabilisation is achieved
• Fasciotomy performed at the same sitting (high risk of compartment syndrome post-reperfusion)
• Failure of vascular repair (clotting) occurs in 30-58% and requires prompt revision
• Amputation rates: 5-41% in IIIC fractures

Salvage vs. Amputation

• Limb is the source of life-threatening haemorrhage
• Avascular limb with warm ischaemia time >6 hours
• Extensive crush injury, especially with ipsilateral foot involvement

Summary of Treatment Sequence

Haemorrhage control → Sterile dressing → IV antibiotics (within 1-3 h) → Tetanus → Imaging
→ Surgery (debridement + lavage) → Skeletal stabilisation (internal fixation or ex-fix)
→ Soft-tissue closure/coverage (primary/flap/SSG) → Post-op monitoring for compartment
syndrome, vascular compromise, and infection

• [Rockwood and Green's Fractures in Adults, 10th ed. 2025](Rockwood & Green's Fractures, Chapters 16 & 5) - classification, debridement protocols, timing, vascular management, limb salvage
• [Campbell's Operative Orthopaedics, 15th ed. 2026](Campbell's, Chapter 58) - antibiotic regimens, OTA-OFC, management principles
• [Bailey and Love's Short Practice of Surgery, 28th ed.](Bailey & Love's, p. 442) - Gustilo-Anderson classification table
• [Sabiston Textbook of Surgery](Sabiston, p. 767) - antibiotic administration timing