Overview
Open fractures are a surgical urgency in which the fracture haematoma communicates with the external environment, placing the patient at risk of deep infection, osteomyelitis, and fracture,related infection (FRI). The four pillars of management — established in the latter half of the twentieth century and substantially unchanged — are:
- Antibiotic prophylaxis (and tetanus prophylaxis)
- Urgent wound debridement and irrigation
- Fracture stabilisation
- Early definitive soft tissue coverage
Infection rates correlate directly with the extent of soft tissue damage:
| Gustilo Grade | Infection Rate | |,,,|,,,| | Type I | 0–2% | | Type II | 2–7% | | Type IIIA | ~7% | | Type IIIB | 10–50% | | Type IIIC | 25–50% |
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Soft Tissue Injury: Anatomical Principles
The zone of injury extends beyond the visible wound. High,energy mechanisms disrupt the microvasculature over a wide field, producing tissue devitalisation that may not be apparent at initial presentation. Periosteal stripping compromises cortical blood supply and compounds the risk of avascular necrosis, non,union, and infection.
Compartment syndrome remains a risk even with an open wound; the wound itself rarely provides adequate fascial decompression. Clinical compartment assessment is mandatory in all high,energy open fractures.
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Gustilo,Anderson Classification
The Gustilo,Anderson (GA) classification is the most widely used open fracture classification worldwide. Originally derived from open tibial fractures, it is applied broadly to long,bone open injuries. The definitive grade is assigned in the operating theatre at completion of debridement, not at initial presentation, because the full extent of soft tissue injury may only become apparent intraoperatively.
| Grade | Wound Size | Energy | Soft Tissue | Contamination | |,,,|,,,|,,,|,,,|,,,| | I | ≤ 1 cm | Low | Minimal; inside,out puncture | Clean | | II | 1–10 cm | Moderate | Moderate muscle damage; little periosteal stripping | Moderate | | IIIA | > 10 cm | High | Extensive periosteal stripping; adequate soft tissue cover still achievable | High (farm, gunshot, shotgun injury) | | IIIB | > 10 cm | High | Inadequate local soft tissue; requires flap coverage | Extensive | | IIIC | Variable | High | Same as IIIA/B; associated vascular injury requiring repair | Extensive |
, IIIB is defined by the requirement for flap coverage after debridement. , IIIC is defined by an associated vascular injury requiring repair for limb salvage, regardless of wound size.
A recognised limitation of the GA system is that it uses the treatment decision (flap requirement) to determine the grade, rather than guiding treatment — and it was designed specifically for open tibial fractures.
OTA Open Fracture Classification
The Orthopaedic Trauma Association (OTA) classification was developed to address these shortcomings. It assesses five independent, objectively identifiable domains:
| Domain | Examples of Subcategories | |,,,|,,,| | Skin | Laceration size, location, skin loss | | Muscle | Viability, degree of loss | | Arterial injury | Absent / present / repair required | | Contamination | None / surface / gross | | Bone loss | None / present / segmental |
The OTA system aims to guide treatment rather than reflect it, and is particularly useful for research and multicentre comparison.
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Initial Clinical Assessment and Emergency Management
History
, Mechanism and energy of injury (low,velocity vs high,velocity, farm/rural environment, crush, blast, gunshot) , Time elapsed since injury — critical for antibiotic and debridement timing , Tetanus immunisation status , Allergies (penicillin/cephalosporin) , Comorbidities: diabetes mellitus, peripheral vascular disease, immunosuppression, renal impairment
Examination
, ATLS primary and secondary survey — life before limb , Wound: size, visible contamination, exposed bone/tendon/neurovascular structures , Neurovascular status: distal pulses, capillary refill, sensation, motor function; ABI if vascular injury suspected , Compartment assessment: pain with passive stretch, tense compartments , Associated injuries
Immediate Wound Management in the Emergency Department
, Cover with a saline,soaked gauze dressing — do not repeatedly inspect or washout in the ED; ED washout is not a substitute for operative debridement , Remove gross contamination (soil, gravel) manually if present , Photograph the wound prior to covering , Reduce and provisionally splint — reduces pain, bleeding, and further soft tissue damage , Obtain plain radiographs (minimum two orthogonal views); CT for articular involvement or surgical planning
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Investigations
| Investigation | Indication | |,,,|,,,| | Plain radiographs (AP + lateral) | All open fractures | | CT | Articular fractures, segmental injuries, pelvic/acetabular involvement, surgical planning | | CT angiography / formal angiography | Suspected vascular injury (ABI < 0.9, absent pulse, expanding haematoma) | | Wound swab | Not routinely recommended at presentation — poor predictive value for infecting organism | | FBC, U&E, coagulation, group & hold | Preoperative workup; renal function prior to aminoglycoside use |
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Antibiotic Prophylaxis
Principles
Prophylactic antibiotics reduce the absolute risk of infection by approximately 7% (ARR; 95% CI 0.03–0.10) when combined with debridement, irrigation, and stabilisation. Administration as soon as possible after injury — and ideally within 3 hours — is the consensus target. For type III fractures specifically, delay beyond 60–66 minutes from injury has been shown to independently increase the odds of deep infection (OR 3.78).
Antibiotics are not a substitute for debridement. The following should be explicitly avoided: , Continuing antibiotics to cover wound drains , Continuing empirical antibiotics until wounds are dry , Prophylactic antibiotics to prevent pin,tract infections with external fixators , Antibiotic therapy as a substitute for debridement of necrotic or contaminated tissue
Antibiotic Selection by Gustilo Grade
| Gustilo Grade | First,line | Penicillin/Cephalosporin Allergy | Additional Coverage | |,,,|,,,|,,,|,,,| | Type I | Cefazolin 2 g IV 8,hourly | Clindamycin 900 mg IV 8,hourly | — | | Type II | Cefazolin 2 g IV 8,hourly | Clindamycin 900 mg IV 8,hourly | — | | Type IIIA/B/C | Cefazolin + Gentamicin 4–5 mg/kg IV daily | Clindamycin + Gentamicin | — | | Fecal / clostridial contamination (farm) | Above + Penicillin 1 MU IV 4,hourly | Clindamycin substituted for penicillin | Anaerobic/clostridial cover | | Freshwater exposure (Aeromonas) | Ciprofloxacin or 3rd/4th,generation cephalosporin (e.g. ceftazidime) | — | — | | Saltwater exposure (Vibrio) | Doxycycline + Ceftazidime or fluoroquinolone | — | — | | MRSA risk or known colonisation | Add vancomycin or teicoplanin | — | — |
Important notes on antibiotic selection: , Ciprofloxacin as monotherapy for type III fractures is associated with an unacceptably high infection rate (~31%) and animal data suggest delayed fracture union — fluoroquinolones should not be used as routine monotherapy for type III injuries. , For type IIIB/C delayed coverage, hospital,acquired organisms predominate; addition of vancomycin or teicoplanin at the time of delayed closure/flap surgery is recommended by some protocols. , Alternative broad,spectrum options for type III include piperacillin/tazobactam or third,generation cephalosporins (ceftriaxone) when aminoglycosides are contraindicated.
Duration of Antibiotic Therapy
| Wound Status | Duration | |,,,|,,,| | Type I — primary closure at debridement | 24 hours total | | Type II/IIIA — delayed primary closure | 24 hours after final wound closure | | Type IIIB/IIIC — flap/delayed coverage | 24 hours after final coverage; evidence does not support routine extension beyond 72 hours |
Evidence consistently demonstrates that prolonging antibiotics beyond wound closure does not further reduce infection rates. Infection in open fractures is primarily determined by the extent of tissue damage, not the duration of prophylaxis.
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Tetanus Prophylaxis
Tetanus is caused by the exotoxin of Clostridium tetani (producing convulsions and severe muscle spasm) with 30–40% mortality if established. All open fractures require tetanus risk stratification based on wound characteristics and immunisation history.
| Immunisation History | Clean Minor Wound | All Other Wounds (including open fractures) | |,,,|,,,|,,,| | Fully immunised, booster within 5 years | Nothing required | Nothing required | | Fully immunised, booster 5–10 years ago | Nothing required | Tetanus toxoid booster | | Fully immunised, booster > 10 years ago | Tetanus toxoid booster | Tetanus toxoid + immunoglobulin | | Unknown or incomplete immunisation | Tetanus toxoid | Tetanus toxoid + immunoglobulin |
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Debridement Timing
The "Six,Hour Rule" — Current Evidence
The traditional dogma mandating debridement within 6 hours has been challenged by multiple large observational studies and meta,analyses, including the GOLIATH meta,analysis. The 6,hour rule is not supported as an absolute threshold for most open fractures.
| Variable | Current Evidence | |,,,|,,,| | Time to antibiotics | More time,critical than time to debridement; delay >1 hour in type III independently increases infection | | Time to debridement | No clear increase in infection within 24 hours for type I/II; type IIIB/C benefit from urgent debridement but antibiotic timing remains paramount | | Irrigation pressure | High vs low pressure: no difference in infection rates (FLOW trial) | | Negative pressure wound therapy (NPWT) as initial dressing | FLOW trial subanalysis: NPWT increased deep infection regardless of fracture severity — not recommended as routine primary wound dressing |
Surgical Debridement Principles
, Systematic wound extension to assess the full zone of injury , Excision of all devitalised tissue: skin, fat, fascia, muscle , Four Cs of muscle viability: Colour, Contractility, Consistency, Capacity to bleed , Copious irrigation — low,pressure lavage; high,pressure lavage confers no additional benefit and may damage tissue , Periosteal stripping should be minimised; clearly necrotic periosteum is debrided; viable periosteum is preserved , Bone fragments without soft tissue attachment and without structural significance should be removed; structurally important fragments should be retained , "Second look" at 48–72 hours for type IIIB/C injuries before definitive coverage
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Soft Tissue Coverage
Timing
Early definitive coverage is a primary goal. Coverage within 72 hours is associated with infection rates of approximately 1.5% and free flap failure of approximately 0.75%. Delays beyond 72 hours substantially worsen outcomes; delays beyond 7 days independently increase complications in open tibial fractures.
| Coverage Timing | Infection Rate | Free Flap Failure Rate | |,,,|,,,|,,,| | < 72 hours | ~1.5% | ~0.75% | | 72 hours – 3 months | ~2% | ~12% |
The orthoplastic approach — integrated orthopaedic and plastic surgical planning from initial presentation — is now endorsed practice for complex open fractures. Coordination of definitive fixation with flap coverage is within surgical control in most clinical contexts and substantially reduces infection rates.
Reconstructive Options
| Defect | Coverage Option | |,,,|,,,| | Type I / II — small clean wound | Primary closure or delayed primary closure | | Type IIIA — adequate local soft tissue | Delayed primary closure; split,thickness skin graft (STSG) | | Type IIIB proximal/middle third tibia | Gastrocnemius muscle flap (medial or lateral head) ± STSG | | Type IIIB middle/distal third tibia | Soleus muscle flap ± STSG; or free tissue transfer | | Type IIIB distal third tibia / foot / complex | Free tissue transfer (e.g. anterolateral thigh flap, latissimus dorsi free flap) | | Type IIIC | Vascular repair first; staged wound management with early flap coverage |
Recent evidence confirms primary wound closure is feasible and safe in most open fractures up to Gustilo,Anderson type IIIA without significant increased risk.
Temporary Wound Management (Bridge to Definitive Coverage)
, Saline,soaked gauze dressing — appropriate temporary cover in ED and theatre , Antibiotic bead pouches (tobramycin or vancomycin in PMMA) — adjunct in heavily contaminated wounds; not a replacement for debridement , NPWT — appropriate as a bridge between debridement and definitive coverage, but must not replace or delay reconstruction; routine use as primary dressing increases infection risk per FLOW trial
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Fracture Stabilisation
Fracture stabilisation reduces dead space, controls the soft tissue envelope, and enables safe wound coverage.
| Fracture Type | Preferred Stabilisation | |,,,|,,,| | Type I / II diaphyseal | Intramedullary nail (IMN); reamed nailing increasingly supported | | Type IIIA diaphyseal | IMN (reamed or unreamed); external fixation as temporary bridge | | Type IIIB / IIIC | Temporary spanning external fixation → staged conversion to IMN or plate once soft tissues allow | | Articular fractures | Provisional external fixation → ORIF after wound optimisation |
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Complications
| Complication | Notes | |,,,|,,,| | Fracture,related infection (FRI) | Most significant; Gram,positive organisms predominate; Gram,negative and polymicrobial in high,grade wounds; drug,resistant organisms (MRSA, Acinetobacter, Pseudomonas) in combat injuries | | Osteomyelitis | Follows FRI; risk increased with devitalised bone and inadequate debridement | | Non,union / malunion | Periosteal stripping, bone loss, infection | | Compartment syndrome | Must be actively excluded even with open wound | | Free flap failure | Risk markedly increased with coverage delayed beyond 72 hours | | Amputation | IIIC fractures; failure of limb salvage | | Tetanus | Prevented by prompt immunisation | | Aminoglycoside nephrotoxicity | Monitor renal function; once,daily dosing preferred; avoid in conjunction with other nephrotoxins |
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Limb Salvage vs Amputation
In type IIIC injuries, the decision between limb salvage and primary amputation involves ischaemia time, associated nerve injury, bone loss, patient factors, and available reconstructive resources. The MESS (Mangled Extremity Severity Score) and similar scoring systems (e.g. NISSSA, LSI) provide adjunctive guidance only — no single score reliably mandates amputation and clinical judgement remains paramount.
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Paediatric Considerations
, GA classification applies to children but wound healing capacity is generally superior; infection rates are lower for equivalent grades , Physeal injury must be assessed and documented (Salter,Harris classification) , Smaller wounds may be suitable for primary closure after debridement in selected cases — caution required to avoid under,estimating injury , Antibiotic dosing is weight,based; aminoglycoside use requires careful renal monitoring , Tetanus immunisation history is critical; DTPa schedule should be verified and supplemented as indicated , Stabilisation options include elastic nails, Kirschner wires, and external fixation depending on age, size, and fracture pattern — stability facilitates wound management
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Summary: Key Examination Points
| Principle | Recommendation | |,,,|,,,| | GA classification timing | Assigned in theatre after debridement — not in ED | | Antibiotics — timing | As soon as possible; ideally within 1 hour for type III; within 3 hours for all grades | | Antibiotics — type I/II | Cefazolin (1st,generation cephalosporin) | | Antibiotics — type III | Cefazolin + gentamicin ± penicillin (fecal/clostridial contamination) | | Antibiotics — duration | 24 hours post,closure; prolonged courses do not reduce infection | | Ciprofloxacin monotherapy — type III | Unacceptably high infection rate (~31%); avoid as routine | | Tetanus | All open fractures; assess immunisation status; add immunoglobulin if unknown/incomplete | | Debridement timing | Urgent but 6,hour rule not absolute; antibiotic timing more critical than surgical timing | | Irrigation | Low,pressure lavage preferred; high pressure no benefit | | NPWT as primary dressing | Avoid — associated with increased deep infection (FLOW trial) | | Soft tissue coverage | Target < 72 hours; orthoplastic approach; free flap for distal third tibial defects | | IIIB definition | Requires flap coverage after debridement | | IIIC definition | Vascular injury requiring repair for limb salvage |