Most Common Long Bone Fracture | 25% Open | Compartment Syndrome
MANAGEMENT APPROACH
Critical Must-Knows
- 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
Clinical Pearls
- "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
Clinical Imaging
Imaging Gallery





Critical Tibial Shaft Fracture Exam Points
Open Fracture Risk
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.
Compartment Syndrome
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.
IM Nail = Gold Standard
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).
Acceptable Alignment
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.
Quick Decision Guide
| Fracture Type | Key Feature | Treatment | Pearl |
|---|---|---|---|
| Closed, stable, isolated | Low energy, minimally displaced | Cast vs IM nail | Cast if patient preference and reliable |
| Closed, unstable/displaced | High energy, spiral, segmental | Reamed locked IM nail | Gold standard treatment |
| Open Gustilo I-IIIA | Open wound, varying contamination | Debridement + IM nail (primary or staged) | IV Abx within 1 hour |
| Open Gustilo IIIB-IIIC | Soft tissue loss, vascular injury | Ex fix initially, then nail/coverage | Needs plastic surgery for soft tissue |
| Compartment syndrome suspected | Pain out of proportion, tense | Emergency 4-compartment fasciotomy | Don't wait for diagnosis - act |
5 PsCompartment Syndrome 5 Ps
| P | Pain Out of proportion, pain on passive stretch (EARLY) |
| P | Pressure Compartment feels tense (EARLY) |
| P | Paresthesias Numbness/tingling (getting late) |
| P | Paralysis Weakness (LATE - irreversible changes) |
| P | Pulselessness Absent pulses (VERY LATE - limb threatened) |
| P | Pain Out of proportion, pain on passive stretch (EARLY) | P | Paralysis Weakness (LATE - irreversible changes) |
| P | Pressure Compartment feels tense (EARLY) | P | Pulselessness Absent pulses (VERY LATE - limb threatened) |
| P | Paresthesias Numbness/tingling (getting late) |
Hook:The first 2 Ps (Pain, Pressure) are EARLY signs - don't wait for the other 3!
ALPDTibial Compartments
| A | Anterior Tibialis anterior, EHL, EDL, deep peroneal nerve |
| L | Lateral Peroneus longus/brevis, superficial peroneal nerve |
| P | Posterior Deep Tibialis posterior, FHL, FDL, posterior tibial nerve/artery |
| D | Posterior Superficial Gastrocnemius, soleus, sural nerve |
| A | Anterior Tibialis anterior, EHL, EDL, deep peroneal nerve | P | Posterior Deep Tibialis posterior, FHL, FDL, posterior tibial nerve/artery |
| L | Lateral Peroneus longus/brevis, superficial peroneal nerve | D | Posterior Superficial Gastrocnemius, soleus, sural nerve |
Hook:ALPD - All 4 compartments need decompression in fasciotomy!
GAPOpen Fracture Antibiotics
| G | Gustilo I-II Cephalosporin (cefazolin 2g IV) |
| A | Add aminoglycoside Gustilo III - add gentamicin for Gram negatives |
| P | Penicillin Farm contamination - add penicillin for Clostridium |
| G | Gustilo I-II Cephalosporin (cefazolin 2g IV) |
| A | Add aminoglycoside Gustilo III - add gentamicin for Gram negatives |
| P | Penicillin Farm contamination - add penicillin for Clostridium |
Hook:GAP in coverage needs to be closed - step up antibiotics as contamination increases!
5-5-10-10Acceptable Alignment
| 5 | 5° varus/valgus Coronal plane |
| 5 | 5-10° AP angulation Sagittal plane |
| 10 | 10° rotation Very difficult to assess |
| 10 | 10mm shortening Especially with an intact fibula |
| 5 | 5° varus/valgus Coronal plane | 10 | 10° rotation Very difficult to assess |
| 5 | 5-10° AP angulation Sagittal plane | 10 | 10mm shortening Especially with an intact fibula |
Hook:5-5-10-10: Think of it as the acceptable range for tibial shaft alignment!
Overview and Epidemiology
Why This Topic Matters
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.
Demographics
- 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)
Mechanism
- High-energy: MVA, motorcycle, pedestrian
- Sports: Skiing, football (rotational)
- Low-energy: Falls in elderly
- Direct blow or twisting mechanism
Anatomy
Key Anatomical Concept
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
Proximal Tibia
- Tibial plateau (covered elsewhere)
- Tibial tubercle: Patellar tendon insertion
- Gerdy's tubercle: ITB insertion
- Proximal fibula: Safe zone for nailing
Shaft
- 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
| Type | Wound | Contamination | Soft Tissue | Treatment |
|---|---|---|---|---|
| I | Under 1cm | Clean | Minimal damage | Abx, debride, primary IM nail |
| II | 1-10cm | Moderate | Moderate crush | Abx, debride, IM nail |
| IIIA | Over 10cm | High | Adequate coverage possible | Abx, serial debride, nail or ex fix |
| IIIB | Over 10cm | High | Requires flap/graft | Ex fix, plastic surgery, later nail |
| IIIC | Over 10cm | High | Vascular injury needing repair | Vascular repair, ex fix, ?amputation |
Automatic Type III
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
History
- Mechanism: High vs low energy (critical)
- Time since injury (open fracture timing)
- Environment (farm = contaminated)
- Ambulatory status before injury
- Smoking status (non-union risk)
Examination
- 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
Compartment Syndrome Assessment
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.
Compartment Pressure Thresholds
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 Tibial Shaft Fracture from Mimics
| Condition | Distinguishing Feature | Key Investigation | Pitfall |
|---|---|---|---|
| Tibial shaft fracture | Acute trauma, deformity, point tenderness over diaphysis | AP/lateral X-ray including knee and ankle | Always image joints above and below |
| Compartment syndrome (with/without fracture) | Pain out of proportion, pain on passive stretch, tense compartment | Clinical; compartment pressures if equivocal | Can occur with closed or even minimally displaced fractures |
| Tibial stress fracture | Insidious activity-related pain, athlete/runner, no acute trauma | MRI or bone scan (X-ray often normal early) | Anterior cortex 'dreaded black line' is high-risk for completion |
| Maisonneuve injury | Proximal fibula fracture with ankle pain/instability | Full-length tibia-fibula and ankle X-rays | Missed if leg not fully imaged |
| Pathological fracture | Low-energy mechanism, prior pain, lytic/sclerotic lesion | X-ray, MRI, staging if malignancy suspected | Do not nail a possible primary bone tumour before staging/biopsy |
| Tibial plateau / pilon fracture | Articular involvement at knee or ankle | CT with reconstructions | Intra-articular extension changes fixation strategy |
Never Nail Before Excluding Pathology
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
Open Debridement Timing
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 vs Infrapatellar
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.
Fibula Fixation
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.
Routine Fasciotomy / Pressure Monitoring
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.
Fibula Fracture Implications
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

Open Fracture Protocol
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 vs Unreamed
- Reamed preferred for most fractures
- Better union rates (SPRINT trial)
- Unreamed acceptable for open fractures
- Reaming provides autograft effect
Approach Comparison
- Suprapatellar: Less knee pain, easier in obese
- Infrapatellar: Traditional, may have more knee pain
- Study shows similar outcomes
- Surgeon preference
Surgical Technique
Intramedullary Nailing - Gold Standard


Patient Positioning:
- Supine on radiolucent table
- Knee flexed over triangle or padded bolster (90 degrees)
- Ensure adequate C-arm access for AP and lateral views
Entry Point:
- Infrapatellar (transtendinous or paratendinous)
- Suprapatellar approach reduces anterior knee pain
- Entry point at tibial plateau, slightly medial to lateral tibial spine
Reduction Techniques:
- Blocking (Poller) screws for coronal/sagittal deformity
- Fracture table with skeletal traction for difficult reductions
- Percutaneous clamps for temporary stabilization
Nail Insertion:
- Guide wire across fracture, confirm position on AP and lateral
- Ream 1-1.5mm larger than nail diameter
- Insert nail with rotational alignment corrected
Interlocking:
- 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.
Compartment Syndrome Management
Time is Muscle
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.
4 Cs of Muscle Viability
Color (pink, not grey/black), Contractility (twitches when stimulated), Consistency (firm, not mushy), Capacity to bleed (should bleed when cut). Debride non-viable muscle.
Complications

| Complication | Incidence | Risk Factors | Management |
|---|---|---|---|
| Compartment syndrome | 5-10% | High-energy, crush, young males | Emergency 4-compartment fasciotomy |
| Non-union | 5-10% | Open fracture, smoking, infection | Exchange nail, bone graft, plate |
| Malunion | 5-15% | Inadequate fixation, poor reduction | Osteotomy and correction |
| Infection | 1-5% closed, higher open | Open fracture, soft tissue damage | Washout, antibiotics, ? hardware removal |
| Anterior knee pain | 20-50% | Infrapatellar approach, prominent hardware | Hardware removal, rarely severe |
| Hardware failure | Rare | Early weight bearing, non-union | Revision fixation |
Postoperative Care
Immediate Postoperative (Days 0-14)
Wound Management:
- Check surgical wounds at 48 hours
- Incision care for fasciotomy wounds if performed
- Negative pressure wound therapy for significant soft tissue defects
DVT Prophylaxis:
- Chemical prophylaxis for 4-6 weeks
- LMWH preferred (enoxaparin 40mg daily)
- Mechanical prophylaxis with TED stockings
Weight-Bearing Status:
- 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
Physiotherapy:
- 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
Outcomes by Injury Pattern
| Pattern | Union Rate | Time to Union | Key Factors |
|---|---|---|---|
| Closed fracture + IMN | 95-98% | 16-20 weeks | Gold standard treatment |
| Open Grade I-II | 85-95% | 20-26 weeks | Soft tissue management critical |
| Open Grade IIIA | 80-90% | 24-32 weeks | Higher complication rate |
| Open Grade IIIB/C | 70-85% | Variable | High risk complications, may need flap |
Prognostic Factors
Favorable Factors
Simple fracture pattern, Adequate soft tissue coverage, Non-smoker, Young patient, Good bone quality, Early stable fixation
Unfavorable Factors
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

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
Exam Viva Scenarios
Use these scenarios to practise clinical reasoning and management decisions
Scenario 1: Closed Displaced Tibial Shaft Fracture
"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?"
Scenario 2: Gustilo IIIB Open Fracture
"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?"
Scenario 3: Suspected Compartment Syndrome
"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?"
MCQ Practice Points
Epidemiology Question
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.
Compartment Question
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.
Fixation Question
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.
Antibiotic Question
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.
Alignment Question
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.
Irrigation Question
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.
Guidelines, Registries & Global Practice
Global Epidemiology
- 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
Why Practice Varies
- 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
Major Guidelines Side by Side
| Body | Open Fracture Antibiotics | Debridement Timing | Soft-tissue Coverage |
|---|---|---|---|
| BOA / BAPRAS (BOAST Open Fractures, UK) | IV co-amoxiclav or cefuroxime within 1h; add Gram-negative cover for contamination | Within 12h (24h for solitary high-energy without contamination); immediate if marine/agricultural/sewage | Definitive coverage within 72h, ideally combined ortho-plastic 'fix and flap' |
| AAOS / EAST (USA) | First-generation cephalosporin within 1h; add aminoglycoside/Gram-negative cover for type III | Urgent but not strictly 6h; based on contamination and physiology | Early coverage; staged for severe contamination |
| AO Foundation | Early IV prophylaxis; escalate cover with Gustilo grade | Thorough debridement prioritised over a fixed clock | Reconstructive ladder; temporary ex-fix then definitive fixation + flap |
| WHO / limited-resource consensus | Earliest available IV antibiotic; tetanus prophylaxis | As soon as safe theatre access allows | External fixation when plastics unavailable; transfer for coverage |
Registry & Outcome Data
- 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- vs Limited-Resource Practice
- 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
Medicolegal & Documentation Themes (Global)
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.
TIBIAL SHAFT FRACTURES
Clinical summary
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
