Most Common Long Bone Fracture | 25% Open | Compartment Syndrome
- IM nail is treatment of choice for most tibial shaft fractures (closed or open)
- Compartment syndrome: high risk in tibial fractures - maintain vigilance for 24-48 hours
- Open fractures: Gustilo-Anderson classification guides antibiotics and soft tissue coverage timing
- Acceptable alignment: 5° varus/valgus, 10° AP angulation, 10° rotation, 10mm shortening
- Anterior knee pain after nailing is common (20-50%) - discuss with patients
- “25% of tibial shaft fractures are open - highest rate of any long bone
- “Suprapatellar nailing reduces anterior knee pain compared to infrapatellar
- “Compartment syndrome can occur in closed fractures - maintain high index of suspicion
- “Non-union more common in smokers, high-energy, and open fractures
25% of tibial fractures are open - highest of any long bone due to subcutaneous anteromedial border. Gustilo-Anderson classification guides treatment. IV antibiotics within 1 hour.
Tibial fractures have highest compartment syndrome risk. 4 compartments at risk. Pain out of proportion + pain on passive stretch. Fasciotomy within 6 hours of symptom onset.
Reamed locked IM nail is treatment of choice for most tibial shaft fractures. Better union rates than unreamed or plates. Acceptable for open fractures (Gustilo I-IIIA).
5-5-10-10 rule: 5° varus/valgus, 5° (debatable, up to 10°) AP, 10° rotation, 10mm shortening. Greater malalignment leads to abnormal joint loading.
- Key Feature
- Low energy, minimally displaced
- Treatment
- Cast vs IM nail
- Pearl
- Cast if patient preference and reliable
- Key Feature
- High energy, spiral, segmental
- Treatment
- Reamed locked IM nail
- Pearl
- Gold standard treatment
- Key Feature
- Open wound, varying contamination
- Treatment
- Debridement + IM nail (primary or staged)
- Pearl
- IV Abx within 1 hour
- Key Feature
- Soft tissue loss, vascular injury
- Treatment
- Ex fix initially, then nail/coverage
- Pearl
- Needs plastic surgery for soft tissue
- Key Feature
- Pain out of proportion, tense
- Treatment
- Emergency 4-compartment fasciotomy
- Pearl
- Don't wait for diagnosis - act
ALPDTibial Compartments
Hook:ALPD - All 4 compartments need decompression in fasciotomy!
GAPOpen Fracture Antibiotics
Hook:GAP in coverage needs to be closed - step up antibiotics as contamination increases!
5-5-10-10Acceptable Alignment
Hook:5-5-10-10: Think of it as the acceptable range for tibial shaft alignment!
Overview and Epidemiology
Tibial shaft fractures are the most common long bone fracture and have the highest rate of open injuries. The examiner will test knowledge of compartment syndrome, open fracture management, and technical aspects of nailing.
- Bimodal: Young males (high-energy) and elderly females (low-energy)
- Male:Female 3:1 in young adults
- 20-30 years peak in males
- Over 60 years peak in females (osteoporotic)
- High-energy: MVA, motorcycle, pedestrian
- Sports: Skiing, football (rotational)
- Low-energy: Falls in elderly
- Direct blow or twisting mechanism
Anatomy
The tibia has minimal soft tissue coverage anteromedially - the subcutaneous border. This explains the high open fracture rate. The four compartments of the leg are at risk for compartment syndrome with any tibial fracture.
Tibial Anatomy
- Tibial plateau (covered elsewhere)
- Tibial tubercle: Patellar tendon insertion
- Gerdy's tubercle: ITB insertion
- Proximal fibula: Safe zone for nailing
- Triangular cross-section
- Anteromedial surface subcutaneous
- Interosseous membrane to fibula
- Nutrient artery enters posterolaterally
- Minimum diameter at isthmus (mid-junction lower third)
Classification Systems
Gustilo-Anderson Open Fracture Classification
- Wound
- Under 1cm
- Contamination
- Clean
- Soft Tissue
- Minimal damage
- Treatment
- Abx, debride, primary IM nail
- Wound
- 1-10cm
- Contamination
- Moderate
- Soft Tissue
- Moderate crush
- Treatment
- Abx, debride, IM nail
- Wound
- Over 10cm
- Contamination
- High
- Soft Tissue
- Adequate coverage possible
- Treatment
- Abx, serial debride, nail or ex fix
- Wound
- Over 10cm
- Contamination
- High
- Soft Tissue
- Requires flap/graft
- Treatment
- Ex fix, plastic surgery, later nail
- Wound
- Over 10cm
- Contamination
- High
- Soft Tissue
- Vascular injury needing repair
- Treatment
- Vascular repair, ex fix, ?amputation
The following are automatic Gustilo Type III regardless of wound size: (1) High-energy mechanism, (2) Farm contamination, (3) Segmental fracture, (4) Vascular injury, (5) Delayed presentation over 8 hours.
Clinical Assessment
- Mechanism: High vs low energy (critical)
- Time since injury (open fracture timing)
- Environment (farm = contaminated)
- Ambulatory status before injury
- Smoking status (non-union risk)
- Skin: Open wound? Skin tenting? Blisters?
- Compartments: Tense? Pain on passive stretch?
- Neurovascular: Deep peroneal, posterior tibial pulses
- Knee and ankle examination (associated injuries)
- Deformity: Shortening, angulation
Pain out of proportion to injury and pain on passive stretch are the EARLY signs. Do NOT wait for paralysis or pulselessness - these are late and indicate irreversible damage. If in doubt, measure pressures or perform fasciotomy.
Absolute pressure over 30mmHg or delta pressure (DBP - compartment pressure) under 30mmHg are indications for fasciotomy. Clinical diagnosis is paramount - if in doubt, decompress.
Differential Diagnosis & Mimics
- Distinguishing Feature
- Acute trauma, deformity, point tenderness over diaphysis
- Key Investigation
- AP/lateral X-ray including knee and ankle
- Pitfall
- Always image joints above and below
- Distinguishing Feature
- Pain out of proportion, pain on passive stretch, tense compartment
- Key Investigation
- Clinical; compartment pressures if equivocal
- Pitfall
- Can occur with closed or even minimally displaced fractures
- Distinguishing Feature
- Insidious activity-related pain, athlete/runner, no acute trauma
- Key Investigation
- MRI or bone scan (X-ray often normal early)
- Pitfall
- Anterior cortex 'dreaded black line' is high-risk for completion
- Distinguishing Feature
- Proximal fibula fracture with ankle pain/instability
- Key Investigation
- Full-length tibia-fibula and ankle X-rays
- Pitfall
- Missed if leg not fully imaged
- Distinguishing Feature
- Low-energy mechanism, prior pain, lytic/sclerotic lesion
- Key Investigation
- X-ray, MRI, staging if malignancy suspected
- Pitfall
- Do not nail a possible primary bone tumour before staging/biopsy
- Distinguishing Feature
- Articular involvement at knee or ankle
- Key Investigation
- CT with reconstructions
- Pitfall
- Intra-articular extension changes fixation strategy
In a low-energy tibial fracture with antecedent pain or a suspicious lesion, exclude a pathological (especially primary malignant) cause before reaming and nailing - intramedullary instrumentation can disseminate tumour and compromise limb salvage. Stage and biopsy first if in doubt.
Areas of Controversy & Uncertainty
The historical "6-hour rule" is not strongly supported by evidence (Harley 2002). Current consensus prioritises early antibiotics and thorough debridement over a rigid clock, with urgency driven by contamination and physiology.
Suprapatellar nailing reduces knee pain and eases proximal-fracture reduction, but concerns remain about intra-articular debris and patellofemoral cartilage. Long-term comparative data are still limited.
Whether to fix the fibula in distal third tibial fractures is debated - it can aid alignment but may over-constrain and is not routinely required.
Continuous compartment pressure monitoring is not universally adopted; over-reliance on numbers risks both missed and unnecessary fasciotomies. Serial clinical assessment remains central.
Investigations
Imaging Protocol
AP and Lateral of tibia including knee and ankle joints. Assess fracture pattern, displacement, fibula fracture, joint involvement.
If articular extension suspected (plateau or plafond). 3D reconstructions for complex patterns.
If diminished pulses, expanding hematoma, or Gustilo IIIC suspected. Do not delay surgery for this.
Intact fibula may cause varus malalignment - consider fibula osteotomy if difficulty achieving reduction. Fibula fracture at same level suggests higher energy. Proximal fibula fracture - check for ankle instability (Maisonneuve pattern).
Radiographic Example
Management Algorithm
Within 1 hour: IV antibiotics (cefazolin ± gentamicin). Within 6 hours: Debridement for Gustilo III. Photograph wound, cover with saline-soaked gauze, splint. Do not explore in ED.
Intramedullary Nailing
IM Nail Technique
Supine on radiolucent table. Knee flexed for infrapatellar or semi-extended for suprapatellar approach. Bump under knee.
Infrapatellar: Split patellar tendon, entry at anterior tibial cortex, in line with canal. Suprapatellar: Through quads tendon, knee semi-extended.
Pass guidewire across fracture. Ream sequentially (over-ream by 1-1.5mm for reaming debris compaction).
Insert appropriately sized nail. Check rotation clinically and fluoroscopically. Avoid distraction at fracture.
Distal locking first (usually 2 screws). Proximal locking. Consider blocking/Poller screws for metaphyseal fractures.
- Reamed preferred for most fractures
- Better union rates (SPRINT trial)
- Unreamed acceptable for open fractures
- Reaming provides autograft effect
- Suprapatellar: Less knee pain, easier in obese
- Infrapatellar: Traditional, may have more knee pain
- Study shows similar outcomes
- Surgeon preference
Compartment Syndrome Management
Fasciotomy within 6 hours of symptom onset to prevent irreversible muscle necrosis. After 8 hours, myonecrosis begins. Volkmann's contracture is the end result of missed compartment syndrome.
Fasciotomy Technique
Clinical diagnosis confirmed or high suspicion. Do not delay for pressure measurements if clinical picture clear.
Two-incision technique: Anterolateral incision releases anterior and lateral compartments. Posteromedial incision releases deep and superficial posterior compartments.
All four compartments must be released. Extend incisions if muscle bulging persists. Assess muscle viability (4 Cs: color, contractility, consistency, capacity to bleed).
Leave wounds open, loose dressing. Return to OR in 48-72 hours for reassessment. Delayed primary closure, skin graft, or VAC therapy.
Color (pink, not grey/black), Contractility (twitches when stimulated), Consistency (firm, not mushy), Capacity to bleed (should bleed when cut). Debride non-viable muscle.
5 PsCompartment Syndrome 5 Ps
Hook:The first 2 Ps (Pain, Pressure) are EARLY signs - don't wait for the other 3!
Surgical Technique
Intramedullary Nailing - Gold Standard
- Supine on radiolucent table
- Knee flexed over triangle or padded bolster (90 degrees)
- Ensure adequate C-arm access for AP and lateral views
- Infrapatellar (transtendinous or paratendinous)
- Suprapatellar approach reduces anterior knee pain
- Entry point at tibial plateau, slightly medial to lateral tibial spine
- Blocking (Poller) screws for coronal/sagittal deformity
- Fracture table with skeletal traction for difficult reductions
- Percutaneous clamps for temporary stabilization
- Guide wire across fracture, confirm position on AP and lateral
- Ream 1-1.5mm larger than nail diameter
- Insert nail with rotational alignment corrected
- Proximal and distal interlocking screws
- Static locking for unstable fractures
- Consider end caps to facilitate later removal
Meticulous technique ensures optimal alignment and stable fixation.
Complications
- Incidence
- 5-10%
- Risk Factors
- High-energy, crush, young males
- Management
- Emergency 4-compartment fasciotomy
- Incidence
- 5-10%
- Risk Factors
- Open fracture, smoking, infection
- Management
- Exchange nail, bone graft, plate
- Incidence
- 5-15%
- Risk Factors
- Inadequate fixation, poor reduction
- Management
- Osteotomy and correction
- Incidence
- 1-5% closed, higher open
- Risk Factors
- Open fracture, soft tissue damage
- Management
- Washout, antibiotics, ? hardware removal
- Incidence
- 20-50%
- Risk Factors
- Infrapatellar approach, prominent hardware
- Management
- Hardware removal, rarely severe
- Incidence
- Rare
- Risk Factors
- Early weight bearing, non-union
- Management
- Revision fixation
The tibia is the classic nonunion bone, and "exchange nail, bone graft or plate" is not an answer until you have characterised the nonunion. The framework:
- Step 0 - exclude infection. A septic nonunion masquerades as an aseptic one. Check CRP/ESR, scrutinise the history (open injury, wound issues), and have a low threshold for sampling. No graft or revision fixation will work over active infection - treat the infection (debridement, dead-space/soft-tissue management, targeted antibiotics, possibly staged Masquelet) first.
- Hypertrophic ("elephant-foot") nonunion = a MECHANICAL problem. There is abundant callus but inadequate stability; the biology is fine. The fix is more stability: exchange reamed nailing (a larger nail plus the reaming autograft effect) or dynamisation of a statically-locked nail, or revision to a plate. Bone graft is usually not needed.
- Atrophic/oligotrophic nonunion = a BIOLOGICAL problem. Poor callus, poor vascularity. The fix is to restore biology: debride to bleeding bone and add osteoinductive/osteoconductive/osteogenic support (autograft - including RIA graft - and/or BMP) plus adequate stability.
- The unifying "diamond concept": durable union needs mechanical stability + an osteoconductive scaffold + osteoinductive signal + osteogenic cells (and a viable host) - identify which limb is deficient and supply it.
Exam point: classify the tibial nonunion - hypertrophic = mechanical (exchange reamed nail/dynamise), atrophic = biological (debride + graft/BMP) - but always exclude infection first, because nothing unites over sepsis.
Postoperative Care
Immediate Postoperative (Days 0-14)
- Check surgical wounds at 48 hours
- Incision care for fasciotomy wounds if performed
- Negative pressure wound therapy for significant soft tissue defects
- Chemical prophylaxis for 4-6 weeks
- LMWH preferred (enoxaparin 40mg daily)
- Mechanical prophylaxis with TED stockings
- Most nailed tibias: weight-bearing as tolerated immediately
- Unstable or comminuted patterns: touch weight-bearing for 6 weeks
- Plate fixation: non-weight-bearing for 6-8 weeks typically
- Early range of motion for ankle and knee
- Edema management
- Gait training with appropriate aids
Early mobilization reduces complications and optimizes recovery.
Outcomes and Prognosis
Union Rates
- Union Rate
- 95-98%
- Time to Union
- 16-20 weeks
- Key Factors
- Gold standard treatment
- Union Rate
- 85-95%
- Time to Union
- 20-26 weeks
- Key Factors
- Soft tissue management critical
- Union Rate
- 80-90%
- Time to Union
- 24-32 weeks
- Key Factors
- Higher complication rate
- Union Rate
- 70-85%
- Time to Union
- Variable
- Key Factors
- High risk complications, may need flap
Prognostic Factors
Simple fracture pattern, Adequate soft tissue coverage, Non-smoker, Young patient, Good bone quality, Early stable fixation
Comminuted or segmental pattern, Open fracture (higher grades), Smoker, Elderly patient, Diabetes or peripheral vascular disease, Infection
Functional Outcomes
Most patients achieve good to excellent functional outcomes after tibial shaft fractures treated with IMN. Return to pre-injury activity levels is expected in the majority of cases, though high-energy injuries and open fractures have more variable outcomes. Anterior knee pain affects 20-50% of patients following infrapatellar nailing approaches.
Radiographic Healing Examples
Guidelines, Registries & Global Practice
- Most common long bone fracture worldwide (~2% of all fractures)
- Incidence roughly 17 per 100,000 person-years in high-income settings
- Bimodal: young men (high-energy road traffic and sport) and older women (low-energy falls)
- Road traffic injury is the dominant high-energy cause in low- and middle-income countries
- Plastic surgery availability dictates feasibility of early "fix and flap" for Gustilo IIIB
- Implant access (modern nails vs external fixators) varies by resource setting
- Transfer distance to a level 1 / orthoplastic centre affects debridement and coverage timing
- Antibiotic stewardship and microbiology support differ regionally
- Open Fracture Antibiotics
- IV co-amoxiclav or cefuroxime within 1h; add Gram-negative cover for contamination
- Debridement Timing
- Within 12h (24h for solitary high-energy without contamination); immediate if marine/agricultural/sewage
- Soft-tissue Coverage
- Definitive coverage within 72h, ideally combined ortho-plastic 'fix and flap'
- Open Fracture Antibiotics
- First-generation cephalosporin within 1h; add aminoglycoside/Gram-negative cover for type III
- Debridement Timing
- Urgent but not strictly 6h; based on contamination and physiology
- Soft-tissue Coverage
- Early coverage; staged for severe contamination
- Open Fracture Antibiotics
- Early IV prophylaxis; escalate cover with Gustilo grade
- Debridement Timing
- Thorough debridement prioritised over a fixed clock
- Soft-tissue Coverage
- Reconstructive ladder; temporary ex-fix then definitive fixation + flap
- Open Fracture Antibiotics
- Earliest available IV antibiotic; tetanus prophylaxis
- Debridement Timing
- As soon as safe theatre access allows
- Soft-tissue Coverage
- External fixation when plastics unavailable; transfer for coverage
- Long-bone fracture registries (e.g. national hip/trauma databases) consistently show intramedullary nailing as the dominant diaphyseal construct
- Open fracture databases (e.g. UK open-fracture audits aligned to BOAST) demonstrate lower deep-infection rates with combined orthoplastic care and timely coverage
- Registry follow-up confirms higher reoperation in open and high-energy patterns, consistent with SPRINT findings
- High-resource: reamed locked nail, suprapatellar option, early free-flap coverage
- Limited-resource: external fixation as definitive treatment more common; staged nailing if implants available
- Damage-control orthopaedics principles apply universally in polytrauma
- Compartment syndrome vigilance and fasciotomy thresholds are identical worldwide
Key documentation: (1) Time of injury and time of first antibiotic dose for open fractures, (2) Serial compartment checks with times recorded, (3) Consent including anterior knee pain risk for nailing, (4) Smoking-cessation counselling documented. Missed compartment syndrome is among the most common sources of orthopaedic litigation in every jurisdiction.
MCQ Practice Points
Q: What percentage of tibial shaft fractures are open? A: 25% - the highest rate of any long bone. This is due to the subcutaneous anteromedial border of the tibia with minimal soft tissue coverage.
Q: What is the earliest clinical sign of anterior compartment syndrome in the leg? A: Pain on passive plantarflexion of the toes and first web space sensory changes (deep peroneal nerve distribution). Do not wait for paralysis or pulselessness.
Q: What did the SPRINT trial show regarding reamed vs unreamed tibial nailing? A: Reamed nailing had lower re-operation rates for closed tibial shaft fractures. For open fractures, there was no significant difference. Reamed nailing is now standard for closed fractures.
Q: What antibiotic regimen is recommended for Gustilo Type III open fractures? A: Cephalosporin (cefazolin 2g) PLUS aminoglycoside (gentamicin). Add penicillin if farm contamination is present to cover Clostridium species.
Q: What are the acceptable alignment parameters for tibial shaft fractures? A: The 5-5-10-10 rule: 5° varus/valgus, 5-10° AP angulation, 10° rotation, 10mm shortening. Greater malalignment leads to abnormal joint loading and poor outcomes.
Q: What did the FLOW trial show about open fracture wound irrigation? A: Low-pressure saline irrigation is as effective as high-pressure. Soap provided no benefit and may actually increase complications. Simple saline irrigation is recommended.
Exam Viva Scenarios
Practise clinical reasoning and management decisions out loud
“A 35-year-old motorcyclist presents after an accident with a closed, displaced mid-shaft tibial fracture with an intact fibula. He has no other injuries. X-rays show 15° of valgus angulation and 2cm overlap. Neurovascular exam is normal. How would you manage this patient?”
“A 25-year-old pedestrian hit by a car presents with an open tibial fracture. There is a 15cm wound on the anterolateral leg with exposed bone and significant soft tissue stripping. There is no active bleeding and dorsalis pedis pulse is palpable. What is your management?”
“You are called to the ward 8 hours post-operatively for a 28-year-old man who had IM nailing of a closed tibial shaft fracture. The nurses report he is in severe pain despite IV morphine. His leg is in a backslab. On examination, he has severe pain on passive toe extension, the anterior compartment feels tense, and he reports tingling over the first web space. What is your management?”
Key Facts
- Most common long bone fracture
- 25% are open (highest rate)
- 5-10% non-union rate
- IM nail = gold standard treatment
Compartment Syndrome
- 5 Ps: Pain, Pressure, Paresthesias, Paralysis, Pulselessness
- First 2 Ps are EARLY - act on these
- Fasciotomy within 6 hours
- All 4 compartments must be released
Open Fracture Protocol
- Antibiotics within 1 hour
- Gustilo I-II: cefazolin
- Gustilo III: add gentamicin
- Farm: add penicillin
Fixation Choice
- IM nail: most tibial shaft fractures
- Reamed beats unreamed for closed (SPRINT)
- Ex fix: IIIB/IIIC initially
- Plate: metaphyseal, narrow canal
Acceptable Alignment (5-5-10-10)
- 5° varus/valgus
- 5-10° AP angulation
- 10° rotation
- 10mm shortening
Evidence Base and Key Trials
SPRINT Trial - Reamed vs Unreamed Tibial Nailing
- Multicentre blinded RCT - 1319 adults randomised, 1226 (93%) completed 1-year follow-up
- Closed fractures: reamed nailing reduced the primary composite event (11% vs 17%; RR 0.67, 95% CI 0.47-0.96, p=0.03), largely driven by less dynamisation
- Open fractures: no significant difference (RR 1.27, 95% CI 0.91-1.78, p=0.16)
- Delaying reoperation for nonunion to at least 6 months substantially reduced reoperation
Nail vs Plate - Extra-articular Proximal Tibia
- Prospective RCT of 58 closed extra-articular proximal tibial fractures - MIPO plating vs intramedullary nailing
- Nailing had significantly shorter hospital stay (p=0.035) and union time (p=0.004)
- No difference in infection, knee range of motion, malunion or nonunion
- Both implants provided rigid fixation preventing secondary collapse