Tibial Shaft Fractures

Tibial shaft fractures are the most common long bone fracture, about 2% of all fractures, and 25% of them are open, the highest rate of any long bone. Examiners use them to test compartment syndrome, open fracture management and the technical detail of nailing.

Who. The distribution is bimodal. Young men sustain high-energy injuries, with a peak at 20-30 years and a male to female ratio of 3:1 in young adults. Older women sustain low-energy osteoporotic fractures, with a peak over 60 years.

Mechanism. A direct blow or a twisting injury:

• High-energy: motor vehicle accidents, motorcyclists, pedestrians
• Sport: skiing and football (rotational)
• Low-energy: falls in the elderly

The bone. The shaft is triangular in cross-section, and its anteromedial surface is subcutaneous. That border has minimal soft-tissue cover, which explains the high open fracture rate. The interosseous membrane binds it to the fibula, and the canal is narrowest at the isthmus, at the junction of the middle and distal thirds.

Around the knee. The tibial plateau is covered in its own topic. The proximal landmarks that matter for this one:

• Tibial tubercle: the patellar tendon insertion
• Gerdy's tubercle: the iliotibial band insertion
• Proximal fibula: the safe zone for nailing

The four compartments. Any tibial fracture puts all four compartments of the leg at risk of compartment syndrome.

The blood supply. The nutrient artery enters posterolaterally in the upper-middle third and supplies the inner two-thirds of the cortex. Periosteal vessels from the surrounding muscles supply the outer third.

The named arteries. The anterior tibial artery passes anteriorly through the interosseous membrane and is at risk in proximal fractures. The posterior tibial artery runs posterior to the deep compartment and is the main blood supply to the foot.

Segmental fractures. A segmental fracture disrupts the blood supply from both ends and from the periosteum, with a higher risk of non-union and devitalisation. Consider staged treatment.

Gustilo-Anderson grades an open fracture, Tscherne grades the soft-tissue envelope of a closed one, and AO/OTA describes the fracture pattern. Applying Tscherne to an open fracture is a classic exam trap.

Tscherne (Closed Injuries)Gustilo-AndersonAO Classification

Tscherne Classification — the CLOSED soft-tissue envelope

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C0

Soft-tissue injury

None or minimal

Mechanism

Indirect, low energy

Findings

Intact skin, no swelling or contusion

Fixation timing

Immediate definitive fixation

C1

Soft-tissue injury

Superficial abrasion or contusion

Mechanism

Indirect violence

Findings

Abrasion, mild swelling, no fracture blisters

Fixation timing

Definitive fixation; stage if the approach crosses contused skin

C2

Soft-tissue injury

Deep contusion with muscle involvement

Mechanism

Direct, high energy

Findings

Marked swelling, fracture blisters, IMPENDING compartment syndrome

Fixation timing

Staged — spanning external fixator, definitive fixation after soft-tissue recovery

C3

Soft-tissue injury

Compartment syndrome, vascular injury, crush or closed degloving

Mechanism

Severe direct or crush

Findings

Established compartment syndrome, ischaemia, degloving (a Morel-Lavallée lesion is C3 even with intact skin)

Fixation timing

Emergency fasciotomy plus spanning ex-fix; definitive fixation delayed

Grade	Soft-tissue injury	Mechanism	Findings	Fixation timing
C0	None or minimal	Indirect, low energy	Intact skin, no swelling or contusion	Immediate definitive fixation
C1	Superficial abrasion or contusion	Indirect violence	Abrasion, mild swelling, no fracture blisters	Definitive fixation; stage if the approach crosses contused skin
C2	Deep contusion with muscle involvement	Direct, high energy	Marked swelling, fracture blisters, IMPENDING compartment syndrome	Staged — spanning external fixator, definitive fixation after soft-tissue recovery
C3	Compartment syndrome, vascular injury, crush or closed degloving	Severe direct or crush	Established compartment syndrome, ischaemia, degloving (a Morel-Lavallée lesion is C3 even with intact skin)	Emergency fasciotomy plus spanning ex-fix; definitive fixation delayed

The grade drives TIMING — and outranks the fracture pattern

C0-C1 tolerate immediate or early definitive fixation. C2-C3 are staged: spanning external fixator now, definitive fixation only once the envelope recovers — judged by the wrinkle sign, typically 7 to 21 days, under damage-control principles.

A C3 with compartment syndrome is a surgical emergency: fasciotomy and revascularisation take priority over fracture fixation. Decompress first, fix later.

The point examiners are testing: soft-tissue grade predicts complications more than the fracture pattern does. A simple fracture with C3 tissues is more dangerous than a complex fracture with C0 tissues.

Gustilo-Anderson Open Fracture Classification

I

Wound

Under 1cm

Contamination

Clean

Soft Tissue

Minimal damage

Treatment

Abx, debride, primary IM nail

II

Wound

1-10cm

Contamination

Moderate

Soft Tissue

Moderate crush

Treatment

Abx, debride, IM nail

IIIA

Wound

Over 10cm

Contamination

High

Soft Tissue

Adequate coverage possible

Treatment

Abx, serial debride, nail or ex fix

IIIB

Wound

Over 10cm

Contamination

High

Soft Tissue

Requires flap/graft

Treatment

Ex fix, plastic surgery, later nail

IIIC

Wound

Over 10cm

Contamination

High

Soft Tissue

Vascular injury needing repair

Treatment

Vascular repair, ex fix, ?amputation

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

These are automatic Gustilo Type III regardless of wound size:

• High-energy mechanism
• Farm contamination
• Segmental fracture
• Vascular injury
• Delayed presentation over 8 hours

AO/OTA Classification

42-A

Description

Simple

Examples

A1: Spiral, A2: Oblique, A3: Transverse

42-B

Description

Wedge

Examples

B1: Spiral wedge, B2: Bending wedge, B3: Fragmented wedge

42-C

Description

Complex/Segmental

Examples

C1: Spiral, C2: Segmental, C3: Irregular

Type	Description	Examples
42-A	Simple	A1: Spiral, A2: Oblique, A3: Transverse
42-B	Wedge	B1: Spiral wedge, B2: Bending wedge, B3: Fragmented wedge
42-C	Complex/Segmental	C1: Spiral, C2: Segmental, C3: Irregular

History. The answers that change management:

• Mechanism: high or low energy
• Time since injury, which matters for an open fracture
• Environment: a farm injury is contaminated
• Walking ability before the injury
• Smoking, a risk for non-union

Examination.

• Skin: an open wound, skin tenting, blisters
• Compartments: tense, painful on passive stretch
• Neurovascular: deep peroneal and posterior tibial pulses
• Knee and ankle, for associated injuries
• Deformity: shortening and angulation

Compartment syndrome. Tibial fractures carry the highest compartment syndrome risk. The early signs are pain out of proportion to the injury and pain on passive stretch. Paralysis and pulselessness are late and indicate irreversible damage, so do not wait for them; if in doubt, measure the pressures or perform a fasciotomy.

Pressure thresholds. An absolute pressure over 30 mmHg, or a delta pressure (diastolic blood pressure minus compartment pressure) under 30 mmHg, is an indication for fasciotomy. The clinical diagnosis is paramount, and if in doubt, decompress.

Continuous monitoring. Continuous compartment pressure monitoring is not universally adopted. Over-reliance on the numbers risks both missed and unnecessary fasciotomies, and serial clinical assessment remains central.

Differential Diagnosis & Mimics

Radiographs. AP and lateral views of the tibia, including the knee and ankle joints. They show the fracture pattern, displacement, any fibular fracture and any joint involvement.

CT. Indicated if articular extension into the plateau or plafond is suspected, with 3D reconstructions for complex patterns.

CT angiography. For diminished pulses, an expanding haematoma or a suspected Gustilo IIIC injury. Do not delay surgery for it.

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The fibula. An intact fibula may cause varus malalignment; consider a fibular osteotomy if reduction proves difficult. A fibular fracture at the same level suggests higher energy. A proximal fibular fracture means checking for ankle instability, the Maisonneuve pattern.

The decision. Two emergencies are dealt with first: compartment syndrome, and an open fracture or vascular compromise. A stable, low-energy closed fracture within acceptable limits can be treated in a cast and brace. Otherwise a reamed, locked intramedullary nail is the treatment of choice for most tibial shaft fractures, closed or open. A plate is used where a nail is unsuitable, and external fixation, temporary and then converted, for a severe open injury or polytrauma.

Algorithm

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Acceptable alignment. The 5-5-10-10 rule. Greater malalignment leads to abnormal joint loading.

• 5° of varus or valgus (coronal plane)
• 5-10° of anterior or posterior angulation (sagittal plane); the 5° figure is debated, and up to 10° is accepted
• 10° of rotation, which is very difficult to assess; compare with the contralateral leg
• 10 mm of shortening, especially with an intact fibula

Open fractures. The genuinely time-critical step is IV antibiotics within 1 hour, with tetanus prophylaxis. In the emergency department, photograph the wound, cover it with saline-soaked gauze and splint the leg; do not explore it there. Step the antibiotics up as contamination increases:

• Gustilo I-II: a cephalosporin, cefazolin 2 g IV
• Gustilo III: add an aminoglycoside, gentamicin, for Gram-negative cover
• Farm contamination: add penicillin for Clostridium

Debridement timing. Debride urgently, on a planned trauma list, NOT against a six-hour clock (PMID 34058873). The historical six-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.

Vascular compromise. A threatened limb needs angiography and vascular repair with fracture stabilisation.

IM NailingPlate FixationExternal FixationNon-Operative

Intramedullary Nailing

In open fractures. The nail is acceptable for open fractures up to Gustilo IIIA.

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Reamed or unreamed. Reaming is preferred for most fractures and provides an autograft effect. The SPRINT trial found the advantage in closed fractures, where reamed nailing reduced the primary composite event, largely through less dynamisation. In open fractures there was no significant difference, and unreamed nailing is acceptable.

Suprapatellar or infrapatellar. The infrapatellar approach is the traditional one and may cause more knee pain. Suprapatellar nailing reduces knee pain, is easier in the obese and eases reduction of proximal fractures, but concerns remain about intra-articular debris and patellofemoral cartilage.

Where that leaves the choice. Long-term comparative data are still limited, a study has shown similar outcomes, and the approach remains surgeon preference.

Plate Fixation

When to plate. The indications, and the reason each favours a plate:

Metaphyseal-diaphyseal or periarticular extension; very proximal or distal fracture

Reason

Insufficient nail purchase; nail fixation poor

Plate Type

Locking plate (MIPO)

Narrow medullary canal (under 8mm), e.g. paediatric

Reason

Cannot accommodate nail

Plate Type

Plate or flexible nails

Associated knee/ankle arthroplasty

Reason

Protect prosthesis

Plate Type

Plate

Segmental bone loss

Reason

Distraction with nail difficult

Plate Type

Plate ± bone graft

Active infection

Reason

Relative indication

Plate Type

Plate

Patient preference

Reason

Avoid knee pain

Plate Type

Rare indication

Indication	Reason	Plate Type
Metaphyseal-diaphyseal or periarticular extension; very proximal or distal fracture	Insufficient nail purchase; nail fixation poor	Locking plate (MIPO)
Narrow medullary canal (under 8mm), e.g. paediatric	Cannot accommodate nail	Plate or flexible nails
Associated knee/ankle arthroplasty	Protect prosthesis	Plate
Segmental bone loss	Distraction with nail difficult	Plate ± bone graft
Active infection	Relative indication	Plate
Patient preference	Avoid knee pain	Rare indication

MIPO. Minimally invasive plate osteosynthesis preserves the periosteal blood supply: small incisions, submuscular plate passage and locking screws, through a medial or anterolateral approach. It is the preferred plating technique. Locking plates suit osteoporotic bone, and bridge plating suits comminution.

Plate or nail for the proximal tibia. Plating is not clearly the better implant here. In Meena's randomised trial of extra-articular proximal tibial fractures, nailing shortened hospital stay and time to union with no difference in infection, knee motion, malunion or nonunion. Both are valid, and nailing may offer faster recovery where a stable construct is achievable.

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External Fixation

As definitive treatment. External fixation, including a ring fixator for complex patterns, can be the definitive treatment for:

• Severely contaminated wounds
• Massive soft-tissue loss (IIIB/IIIC)
• Damage control in polytrauma

As a bridge. Temporary external fixation holds the fracture while the soft tissues are resuscitated, with staged conversion to a nail once they recover.

Ex Fix to IM Nail Conversion

Convert to a nail within 2-3 weeks, before the pin sites become colonised or infected; delay raises the infection risk. Remove the pins, wait 24-48 hours if possible, then nail.

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Conservative Management

Who. A low-energy, stable fracture with under 5° of angulation, under 10mm of shortening and under 50% translation, in a patient reliable for follow-up.

Cast/Brace Protocol

Long Leg CastWeeks 0-6

Above-knee cast with knee in 5-10° flexion, ankle at 90°. Partial weight bearing with crutches.

Patellar Tendon BearingWeeks 6-12

PTB cast or fracture brace when callus visible. Full weight bearing as tolerated.

MobilisationWeek 12+

Wean from brace as union progresses. Average time to union: 16-20 weeks.

Functional bracing. Sarmiento's functional brace uses the hydraulic effect of the contained soft tissues to maintain alignment. It requires an intact soft-tissue envelope and patient compliance, and gives good results, but union takes longer than after surgery.

The decision. A confirmed clinical diagnosis or high suspicion is enough. Do not delay for pressure measurements if the clinical picture is clear.

The fasciotomy.

1. Two incisions: an anterolateral incision releases the anterior and lateral compartments, and a posteromedial incision releases the deep and superficial posterior compartments.
2. Release all four compartments, extending the incisions if the muscle keeps bulging.
3. Assess muscle viability by the 4 Cs and debride non-viable muscle.
4. Leave the wounds open under a loose dressing and return to theatre at 48-72 hours for reassessment, then delayed primary closure, skin graft or VAC therapy.

Intramedullary Nailing

Positioning. Supine on a radiolucent table, with C-arm access for AP and lateral views and a bump under the knee. For the infrapatellar approach the knee is flexed to 90° over a triangle or padded bolster; for the suprapatellar approach it is semi-extended.

Entry. Infrapatellar entry goes through the patellar tendon, splitting it (transtendinous), or beside it (paratendinous). Suprapatellar entry goes through the quadriceps tendon with the knee semi-extended.

The entry point. On the tibial plateau, slightly medial to the lateral tibial spine, high and in line with the canal. The entry point is critical for alignment: a lateral entry causes valgus, a medial entry varus, and one too anterior drives procurvatum.

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The nail.

1. Pass the guidewire across the fracture and confirm its position on AP and lateral views.
2. Ream sequentially to 1-1.5mm larger than the nail diameter, over-reaming for compaction of the reaming debris.
3. Insert an appropriately sized nail, correcting rotation and checking it clinically and fluoroscopically. Avoid distraction at the fracture.
4. Lock distally first, usually with 2 screws, then proximally. Lock statically for unstable fractures, and consider end caps to make later removal easier.

Fluoroscopy throughout confirms alignment against the 5-5-10-10 limits.

Reduction aids.

• Blocking (Poller) screws on the concave side of a coronal or sagittal deformity, and in metaphyseal fractures
• Percutaneous bone reduction clamps for temporary stabilisation
• A universal distractor
• A fracture table with skeletal traction for difficult reductions
• A temporary external fixator for severe comminution

Open reduction. For failed closed reduction, soft-tissue interposition or an associated articular injury.

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By Level and Pattern

Distal third and segmental fractures. In the distal third, place the interlocking screws close to the fracture and consider a plate. A segmental fracture takes a long nail, which may need exchange for non-union.

The fibula in distal-third fractures. Whether to fix it is debated. Fixation can aid alignment but may over-constrain, and it is not routinely required.

Wounds. Check surgical wounds at 48 hours and again at the 2-week review. Care for fasciotomy wounds if one was performed, and use negative pressure wound therapy for significant soft-tissue defects.

Thromboprophylaxis. Chemical prophylaxis for 4-6 weeks, LMWH preferred (enoxaparin 40mg daily), with mechanical prophylaxis in TED stockings.

Weight bearing.

• Most nailed tibias: weight bearing as tolerated immediately
• Unstable or comminuted patterns: touch weight bearing for 6 weeks
• Plate fixation: typically non-weight-bearing for 6-8 weeks

Rehabilitation. Early range of motion of the ankle and knee, oedema management and gait training with appropriate aids, progressing to strengthening, range-of-motion exercises, advancing gait training and a return to functional activities. Early mobilisation reduces complications and optimises recovery.

Review. Clinical and radiological review at 6 weeks, then assessment of union at 12 weeks, with radiographs at both. They assess callus formation and implant position and monitor for malunion or hardware failure. The red flags between visits:

• Increasing pain or swelling
• Wound complications
• Progressive deformity
• Persistent non-weight-bearing pain

Union. Clinically, pain-free weight bearing; radiologically, bridging callus on 3 cortices. Open fractures take longer to unite than closed ones, as the outcomes table shows.

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Return to activity. Light activities at 3 months post-union, and full sport typically at 6-12 months depending on demands. Driving typically resumes at 6-8 weeks in an automatic car, later in a manual.

Hardware removal. Not routinely recommended. Consider it for symptomatic hardware, such as prominent implants or anterior knee pain, after a minimum of 12-18 months post-union, and warn of refracture through the screw holes. Where hardware is retained, review annually. Long-term follow-up monitors for late complications and assesses functional outcome.

Prognostic factors. Favourable factors are a simple fracture pattern, adequate soft-tissue coverage, not smoking, a young patient, good bone quality and early stable fixation. Unfavourable ones are a comminuted or segmental pattern, a higher-grade open fracture, smoking, an elderly patient, diabetes or peripheral vascular disease, and infection.

Function. Most patients achieve good to excellent function after nailing, and a return to pre-injury activity levels is expected in the majority. High-energy injuries and open fractures have more variable outcomes.