Overview
Tibial shaft fractures are among the most common long bone fractures encountered in orthopaedic practice. The tibia is particularly vulnerable to injury because of its subcutaneous location along the anterior aspect of the leg. These fractures commonly occur following high-energy trauma such as road traffic accidents but may also occur due to sports injuries or low-energy falls.
One of the most important complications associated with tibial shaft fractures is acute compartment syndrome of the leg. Due to the tight fascial compartments of the leg, swelling following trauma can rapidly increase intracompartmental pressure and compromise tissue perfusion. If not recognized early, compartment syndrome may result in irreversible muscle necrosis, nerve injury, and permanent disability.
Prompt recognition and management of compartment syndrome are therefore essential components of tibial shaft fracture care. Orthopaedic surgeons must maintain a high index of suspicion, especially in high-energy injuries.
Anatomy of the Tibial Shaft
The tibia is the primary weight-bearing bone of the leg. It extends from the knee joint proximally to the ankle joint distally and provides structural support for the lower limb.
- Triangular cross-sectional shape
- Anterior border is subcutaneous
- Medial surface lacks significant soft tissue coverage
- Blood supply from nutrient artery and periosteal vessels
Because of limited soft tissue coverage, tibial fractures are frequently associated with open injuries.
Compartments of the Leg
The leg contains four fascial compartments that may develop increased pressure following trauma.
| Compartment | Contents |
|---|---|
| Anterior | Tibialis anterior, deep peroneal nerve |
| Lateral | Peroneus muscles, superficial peroneal nerve |
| Superficial posterior | Gastrocnemius and soleus |
| Deep posterior | Tibial nerve and posterior tibial vessels |
Compartment syndrome occurs when increased pressure within these compartments compromises blood flow to muscles and nerves.
Mechanism of Injury
- Road traffic accidents
- Sports injuries
- Falls from height
- Direct blow to leg
- Twisting injuries
High-energy injuries often result in comminuted fractures and extensive soft tissue damage.
Classification
Tibial shaft fractures are commonly classified using the AO/OTA system.
| AO Type | Description |
|---|---|
| 42-A | Simple fracture |
| 42-B | Wedge fracture |
| 42-C | Complex fracture |
Clinical Features of Tibial Shaft Fracture
- Pain and swelling in leg
- Deformity of the limb
- Inability to bear weight
- Possible open wound
- Tenderness over fracture site
Compartment Syndrome
Acute compartment syndrome is a surgical emergency. It occurs when intracompartmental pressure rises to a level that compromises tissue perfusion.
- Most common after tibial shaft fractures
- Can occur after crush injuries
- May develop following reperfusion injury
Clinical Signs of Compartment Syndrome
- Severe pain out of proportion to injury
- Pain on passive stretch
- Paresthesia
- Paralysis (late sign)
- Pulselessness (very late sign)
Pain on passive stretching of muscles within the affected compartment is one of the earliest and most reliable clinical signs.
Diagnosis
- Primarily clinical diagnosis
- Measurement of compartment pressures if uncertain
- Delta pressure less than 30 mmHg indicates compartment syndrome
Management
Immediate fasciotomy is required to relieve compartment pressure.
- Emergency surgical decompression
- Two-incision four-compartment fasciotomy
- Wound left open initially
- Delayed closure or skin grafting
Treatment of Tibial Shaft Fractures
| Treatment | Indication |
|---|---|
| Casting | Stable fractures |
| Intramedullary nailing | Most displaced fractures |
| External fixation | Severe soft tissue injury |
Complications
- Compartment syndrome
- Nonunion
- Malunion
- Infection
- Chronic pain
Exam Pearls
- Tibia is the most common long bone fracture associated with compartment syndrome
- Pain on passive stretch is an early sign
- Emergency fasciotomy is the definitive treatment
- AO classification type 42