Residency · Residency · Orthopedic Surgery
Tibial Shaft Fractures: Nailing, Plating, and External Fixation
Overview
Tibial shaft fractures are the most common long bone fracture. The tibia is subcutaneous along its anteromedial border, giving it a low threshold for open fractures and soft tissue compromise. Treatment depends on fracture pattern, location, soft tissue status, and associated injuries, with intramedullary nailing serving as the gold standard for diaphyseal fractures.
Anatomy
The tibia has a triangular cross-section, and its anteromedial surface is subcutaneous with no muscle coverage. Blood supply comes from the nutrient artery (a branch of the posterior tibial artery) that enters the posterolateral cortex in the proximal third and supplies the inner two-thirds of the cortex, while periosteal vessels supply the outer one-third. The leg contains four compartments: anterior, lateral, superficial posterior, and deep posterior. The fibula contributes to ankle stability but bears only about 6 to 17% of axial load at the knee. The proximal tibia flares into a wide metaphysis susceptible to valgus-producing deforming forces, while the distal tibia has thin cortex and limited blood supply that predispose to healing problems.
Classification
The AO/OTA system classifies tibial shaft fractures as 42A (simple), 42B (wedge), and 42C (complex). Open fractures are classified by the Gustilo-Anderson system. Location is described as proximal, middle, or distal third, distinguishing metaphyseal from diaphyseal involvement.
Nonoperative Management
Nonoperative management is indicated for closed, stable fractures with acceptable alignment: less than 5 degrees of varus or valgus, less than 10 degrees of AP angulation, less than 10 degrees of rotation, less than 1 cm of shortening, and greater than 50% cortical contact. Initial treatment is a long leg cast with 5 to 10 degrees of knee flexion, transitioning to a patellar tendon-bearing cast or functional brace at 4 to 6 weeks. Close radiographic follow-up is necessary because fractures can displace during the first 2 to 3 weeks. Functional bracing as described by Sarmiento is effective for stable, closed midshaft fractures with union rates around 90%. Disadvantages include prolonged immobilization, ankle stiffness, muscle atrophy, and the need for close follow-up.
<image>Anteroposterior and lateral radiographs showing tibial shaft fracture patterns: transverse, oblique, spiral, and comminuted</image>
Intramedullary Nailing
Indications
Nailing is the standard treatment for displaced diaphyseal tibial fractures, open fractures (Gustilo I through IIIA), and fractures that fail nonoperative management.
Technique
The suprapatellar (semi-extended) approach is increasingly preferred. The patient is supine with the knee flexed 15 to 20 degrees on a radiolucent triangle, and the nail is inserted through a protective sleeve through the quadriceps tendon. This approach offers better alignment for proximal and distal fractures, easier reduction, and less patellar tendon damage. The traditional infrapatellar approach uses a medial or lateral parapatellar tendon splitting with the knee flexed over the table's end or on a radiolucent triangle. Its disadvantage is anterior knee pain, which occurs in up to 40 to 60% of patients, and difficulty with proximal fractures due to procurvatum. The starting point is the center of the tibial plateau on AP and at the anterior edge of the articular surface on the lateral. Reamed nailing is preferred because it allows a larger nail, better cortical contact, and lower hardware failure rate. Static interlocking with proximal and distal screws controls length and rotation.
Proximal Third Fractures -- Special Challenges
Proximal third fractures tend toward valgus and apex anterior (procurvatum) deformity. The patellar tendon pulls the proximal fragment into extension and valgus, while the pes anserinus pulls into valgus. Strategies to prevent malalignment include semi-extended (suprapatellar) nailing, blocking (Poller) screws placed medial to the nail in the proximal fragment to prevent valgus and posterior to prevent procurvatum, unicortical plate as a reduction aid, temporary external fixation or provisional reduction with pointed reduction clamps, and a starting point that is slightly more lateral and posterior.
Distal Third Fractures -- Special Challenges
The wide metaphyseal canal in the distal third provides poor nail-bone contact, and these fractures tend toward valgus and translation. Blocking screws are essential for alignment control in the distal metaphysis, and at least two distal interlocking screws in different planes should be placed. Plate fixation should be considered if acceptable alignment cannot be achieved with nailing.
Fibular Fixation
Fibular fixation is generally not required for midshaft tibial fractures. Indications include ankle instability from a distal fibula fracture with syndesmotic injury, significant shortening where fibular fixation restores length, and some distal third tibial fractures where fibular fixation aids reduction. An intact fibula can sometimes prevent tibial compression and cause varus malalignment, and fibular osteotomy may be considered in select cases of delayed tibial union with an intact fibula.
Plate Fixation
Indications
Plating is indicated for proximal and distal metaphyseal fractures when nailing is technically difficult or produces malalignment, fractures with articular extension, failed nailing, and narrow canals.
MIPO (Minimally Invasive Plate Osteosynthesis)
MIPO uses a medial or anterolateral approach with percutaneous plate insertion and indirect reduction, preserving fracture biology by avoiding periosteal stripping. It is particularly useful for distal third tibial fractures. Medial plating provides direct subcutaneous placement but risks hardware prominence, while anterolateral plating requires submuscular dissection but avoids subcutaneous hardware.
Open Plating
Open plating with large fragment plates (3.5 mm LCP) and direct reduction with anatomic plate application carries higher soft tissue morbidity compared to MIPO and is reserved for fractures requiring direct articular reduction.
<image>Comparison of intramedullary nailing versus MIPO plate fixation for distal third tibial shaft fracture</image>
External Fixation
Indications
External fixation is indicated for open fractures with severe soft tissue injury (Gustilo IIIB and IIIC) as temporary stabilization before definitive fixation, damage control orthopedics in polytrauma, infected nonunion, fractures with extensive bone loss (ring fixator for transport), and definitive treatment in select cases such as severe open fractures or burns.
Types
Uniplanar external fixation is the standard trauma fixation. Multiplanar frames (Ilizarov or Taylor Spatial Frame) are used for complex deformity correction, bone transport, and nonunion treatment, allowing gradual correction of multiplane deformities and distraction osteogenesis for bone defects.
Conversion to Internal Fixation
The external fixator is removed with local wound care. Conversion to an intramedullary nail should occur within 2 weeks if possible to maintain a lower infection rate. Delay beyond 2 weeks after external fixator removal increases the risk of deep infection after conversion to nailing. Pin-site infection is a relative contraindication to early conversion, and the infection should be treated first.
Healing and Dynamization
Expected Healing Timeline
Closed fractures typically reach clinical union in 12 to 16 weeks, while open fractures take longer, especially Gustilo III injuries. Healing markers include painless weight-bearing and bridging callus on three of four cortices on radiographs.
Dynamization
Dynamization involves removing interlocking screws (typically those farther from the fracture) to allow axial micromotion. It is considered at 3 to 6 months if delayed union is present but is only effective for transverse or short oblique patterns, as it will cause shortening in comminuted fractures. Exchange nailing with a larger reamed nail is an alternative for delayed union or nonunion.
Nonunion Treatment
Hypertrophic nonunion is treated with stabilization through exchange nailing or plate augmentation with compression. Atrophic nonunion requires stabilization plus bone grafting with autogenous iliac crest or reamer-irrigator-aspirator material. Infected nonunion requires debridement, temporary stabilization with external fixation and antibiotic cement, and staged reconstruction.
Complications
Anterior Knee Pain
Anterior knee pain is the most common complication of tibial nailing, occurring in 20 to 50% of patients. It is multifactorial, involving patellar tendon injury, infrapatellar nerve damage, and altered knee biomechanics. The suprapatellar approach may reduce its incidence, and it often improves after nail removal.
Compartment Syndrome
The risk is highest in closed, high-energy fractures and crushing injuries. Close monitoring in the first 24 to 48 hours is essential.
Malunion
Proximal and distal third fractures carry the highest risk. Valgus and procurvatum occur in proximal fractures, and valgus in distal fractures. Prevention relies on blocking screws, proper starting point, and semi-extended nailing.
Infection
Infection risk is higher with open fractures and conversion from external fixation. Treatment involves hardware removal if loose, debridement, and antibiotics.
<image>Blocking (Poller) screw placement in proximal and distal tibial fractures to prevent malalignment during nailing</image>
Clinical Pearls
The semi-extended (suprapatellar) nailing technique has significantly improved alignment in proximal and distal tibial fractures and should be in every resident's repertoire. Blocking screws are the single most useful technique for preventing malalignment in metaphyseal tibial fractures and should be learned and used early and often. In distal third tibial fractures, MIPO plating and nailing have comparable outcomes, and the choice should be based on fracture pattern and surgeon experience. The ankle joint should always be evaluated in tibial shaft fractures because associated ankle fractures or syndesmotic injury change the management. An intact fibula in the setting of a tibial shaft fracture can be a double-edged sword: it may maintain length but can prevent compression and cause varus deformity. Delayed union is common with tibial shaft fractures, and smoking cessation is the most impactful modifiable factor.
References
- Bhandari M, et al. Operative vs. nonoperative treatment of tibial shaft fractures: a meta-analysis. Clin Orthop Relat Res. 2001;(383):279-293.
- SPRINT Investigators. Randomized trial of reamed and unreamed intramedullary nailing of tibial shaft fractures. JBJS Am. 2008;90(12):2567-2578.
- Tornetta P, Collins E. Semiextended position of intramedullary nailing of the proximal tibia. Clin Orthop Relat Res. 1996;(328):185-189.
- Krettek C, et al. The use of Poller screws as blocking screws in stabilising tibial fractures treated with small diameter intramedullary nails. J Bone Joint Surg Br. 1999;81(6):963-968.
- Newman SD, et al. Suprapatellar nailing of tibial fractures. Bone Joint J. 2019;101-B(1):51-57.
