Executive Editor: Peter Trafton

Authors: Martin Hessmann, Sean Nork, Christoph Sommer, Bruce Twaddle

Distal tibia 43-B3 ORIF

Plate and screws

1. Single-stage or multiple-stage surgery?

General principles of Management

The soft-tissue conditions usually dictate the choice of procedure: early single-stage, or multiple-stage surgery. The decision is based on the individual situation rather than on general principles.

Displaced fractures with minimal closed soft-tissue injury

(Tscherne classification, closed fracture grade 0, rarely grade 1)

Reconstruction may be done with a single-stage procedure, similar to the proposals of Rüedi and Allgöwer. This involves complete restoration of the ankle mortise including fibula and tibia. This may require bone grafting and usually a buttress plate. The goal is absolute stability of the joint surface, to permit early motion and achieve healing with anatomical alignment.

Grossly displaced fractures and / or fractures with moderate to severe closed soft-tissue injury

(Tscherne classification, closed fracture grade 2 or 3)

To avoid wound healing problems, it is generally advisable to proceed in two or more stages: Closed reduction and joint bridging external fixation in a first stage. After 5-10 days ("skin wrinkling sign") definitive open reconstruction, respecting the soft tissues, can safely be carried out.

Open pilon fractures

These are very severe injuries often requiring plastic surgery for soft-tissue reconstruction. The management includes the following stages:

1. Emergency management: a) Wound debridement and lavage, b) joint-bridging external fixation. Fibular fixation may also be considered, but rarely adds benefit and may require another incision through badly injured tissue. c) Open wound management with occlusive dressing (possible antibiotic bead pouch or vacuum dressing).

2. At 48 hours: Second look with repeated lavage (re-dislocation of fracture/joint!) and re-debridement if necessary. Reconstruction of the tibial articular block. Soft-tissue coverage, local or free flap, if possible. Significant delay of coverage increases infection risk.

3. Definitive stabilization: Bridging of the metaphyseal comminution, with or without bone graft. Depending on the individual situation, definitive stabilization with internal or external fixation may be performed at 48 hours, or preferably later.

Image shows second look at 48 hours with redislocation of the fracture/joint and repeated lavage at second look operation.

2. Fibula or tibia first?

Simple fracture of the fibula

If the fibular fracture is simple, this fracture is fixed as a first step by open reduction and stable plate fixation. This indirectly reduces attached lateral fragments of the tibial articular surface through the usually intact syndesmotic ligaments. ORIF of the articular surface of the tibia and stable meta-diaphyseal fixation then follow.

Complex fibular fracture

Comminuted fibular fractures (fig. a) are difficult to reduce accurately. In such cases it is usually better to reconstruct the tibia first, and use the tibia and talus as guides for positioning the lateral malleolus, if necessary. This usually reduces the fibular fracture indirectly. Since the syndesmotic ligaments are usually intact, gross realignment of the fibula often occurs as the tibia is reduced, as illustrated in figure b.

The comminuted fibular fracture can often be stabilized with a subcutaneous plate, without exposing the fragments (fig. c) using a long bridging plate (fig. d). It is essential to achieve correct length, rotation, and axial alignment of the fibula.

3. Preoperative planning

Planning of reduction and fixation

Preoperative planning is an essential part of the treatment of all distal tibial fractures:

  • Obtain good AP and lateral x-rays of both injured and uninjured side; CT if needed
  • Careful study of the x-rays and CT scan
  • Trace AP and lateral x-rays of normal side
  • Identify the individual fracture fragments
  • Draw the fracture fragments, reduced, onto the normal tracing
  • Consider reduction techniques
  • Choose and draw in fixation implants
  • Choice of surgical approach
  • Prepare list of operative steps

This anterior B3-fracture requires open reduction through a limited anterior approach. Sufficient exposure is necessary for direct articular fracture reduction. Plate insertion proximally can be done subcutaneously.

For the reduction of all type B and C pilon fractures with displaced central fragments and/or impaction, the exact approach is planned from the CT scan. Depending on the fracture location and type, an anteromedial, anterolateral, or rarely posteromedial, or posterolateral approach is required.

Ligamentotaxis does not reduce impacted central fragments. Direct manipulation with inspection of the joint is required. Therefore, at least a limited open approach is required for the reduction of the articular surface.

Partial articular (B-type) fractures are usually fixed with lag screws and buttress plates without locking head screws. In the illustrated case, a locking distal tibial plate is selected.

Interfragmentary compression will be applied first with a conventional cortex screw. Locking head screws will then be inserted to maintain stability, while avoiding periosteal compression. Other options involve use of traditional plates. The drawing illustrates the planned final construct (after replacing the cortex screw just proximal to the fracture with a locking head screw.

4. Reduction

Application of a large distractor

A distractor or external fixator is a very helpful tool for reduction. Distraction can be used for open reduction and plate fixation of the fibula as first step and for the reduction and visualization of the articular surface of the tibia as a second step.

Schanz screws are positioned in safe zones of the tibial shaft and talar neck (or the calcaneal tuberosity). In case of previously applied joint-bridging fixator, the same Schanz screws can be used, but distraction applied directly to the talus provides the best control.

Exposure and cleaning of fracture area

The fracture zone is opened by separating the anterior fragments through the sagittal fracture line. The joint is washed out and freed from blood coagulas and small intraarticular osteochondral debris. Inspect and document any cartilage damage on the talar dome. The central part of the fracture with impacted fragments is now visible.

The large central fragment is removed and temporarily set aside.

Reduction of posterocentral part

After cleaning the central fracture lines, the small impacted posterocentral fragment is reduced anatomically to the posterior joint rim under visual control. It is important to reduce any impaction of the most posterior fragment, if present, or joint surface visualized on lateral imaging before beginning reconstruction of the more anterior parts of the joint.

If the posterocentral fragment does not stay in place on its own, it has to be fixed either by a resorbable pin, or a temporary K-wire which is inserted through the posterior part of the medial malleolus, as shown in the illustration.

Reduction of central fragment

Now the large impacted fragment, that had previously been removed, is reduced anatomically to the posterocentral fragment.

Insert a K-wire from anterior to posterior, or from medial to lateral to hold the reduction. Occasionally, it is necessary to cut off this K-wire and leave it in situ to maintain the articular surface reduction (“lost K-wire”).

Finish reduction

Next, the anteromedial and anterolateral fragments are rotated back into their anatomical positions. As shown in the illustration, this may require at least partial release of the distractor, since these fragments can be under tension from the joint capsule. The anteromedial and anterolateral fragments are held in their anatomic position with the help of a Weber clamp. Then K-wires are inserted for temporary stabilization. The correct reduction is assessed and documented by fluoroscopy. See also  assessment of reduction.

Bone graft could be inserted if necessary before reduction of the peripheral fragments. In the illustrated case, with good bone quality and quite large main articular fragments, it was not necessary.

5. Plate fixation - choice of implant

Choice of implant

In the illustrated case, a short LCP pilon plate 2.7/3.5 was planned for fixation. Other options would be a cloverleaf plate 3.5, a small T-plate 3.5 (conventional or locking), or two or more small plates (one-third or one-quarter tubular).

Periarticular plates are manufactured to fit different surfaces of the distal tibia. They still typically require final adjustment of contour.

Example of ORIF with a cloverleaf plate 3.5

Partial articular (B-type) fractures are usually fixed with lag screws and buttress plates without locking head screws. The standard traditional plate is the cloverleaf plate 3.5, which can be placed medially, anteromedially or anteriorly, depending on the fracture pattern. As shown here, the distal tab of the plate can be removed so it doesn’t interfere with the joint.

Example of ORIF with two one-third tubular plates

The illustration shows an example with a double plate technique for the distal tibia, using two one-third tubular plates, applied through an anteromedial approach, and another one-third tubular plate for the fibula.

6. Plate insertion

Plate preparation

In our example, the LCP pilon plate 2.7/3.5 was cut to fit the fracture and local anatomy. Periarticular plates are manufactured to fit different surfaces of the distal tibia. They still typically require final adjustment of contour.

The lateral branches of the plate are bent to hold the anterolateral and anteromedial fragments to fit the bone. The shaft of the plate should be contoured so that the middle part is not touching the bone. This will allow additional interfragmentary compression as the plate is tightened using a conventional screw before any locking head screws.

Plate insertion

After proximal tunneling with a blunt instrument, the prepared plate was inserted. Depending on the fracture situation, the plate might be positioned on the anteromedial aspect, or much less frequently, on the anterior crest of the tibia, as in the illustrated case.

If K-wires are in the way, they can be cut 5-10 mm above the bone surface to allow the plate to be positioned over these K-wires. If this is not possible, replace the K-wires and then apply the plate.

Illustration shows the LCP pilon plate 2.7/3.5 positioned on the anteromedial aspect of the tibia.

7. Compressing the plate

The undercontoured plate is compressed against the bone to add stability. A 3.5 mm cortex screw is inserted proximal to the fracture, and tightened to compress the fragments with the inferior end of the plate. A locking head screw would not provide this compression.

8. Definitive fixation of the articular block

If further interfragmentary compression is necessary, one or two lag screws can be inserted through appropriate plate holes before the first locking head screw is used. Remember that interfragmentary lag screws may be essential for articular fragment stabilization. They can be inserted either outside or through the plate.

Finally, locking head screws are inserted into the joint block to hold the anatomical reduction in place. K-wires are removed stepwise as required for screw application. Using smaller diameter screws may allow better access for fixation (2.7 mm instead of 3.5 mm).

Note
With plates like this screws may intersect. Twisting the plate slightly will allow them to pass.

Pearl – fine contouring of the plate

If the ends of the side branches of the inserted plate do not fit the bone precisely, they can definitively be contoured using two bending bolts. These have to be inserted tightly into the corresponding plate holes. These bolts can also be used to finally twist the branches to allow screw crossing.

Fixation of anterolateral fragment

In case of a screw application through the center of the Tillaux-Chaput fragment, a small separate anterolateral incision might be necessary. Care has to be taken not to damage the superficial peroneal nerve.

9. Finish plate fixation

Proximal plate fixation

A screw is inserted into the most proximal hole of the plate through a stab incision.

Exchange the first conventional screw

The conventional cortex screw that was inserted first can be replaced now with a locking head screw. This avoids periosteal compression under the plate, and gains the improved stability of a locking head screw. If the bone is poor quality, additional locking head screws may be inserted, as illustrated in the hole proximal to the exchanged screw.

10. Final assessment

Before wound closure, radiographic documentation of joint congruity, length of tibia and fibula, and axial alignment is mandatory. This final operative x-ray confirms the anatomical reduction and the correct position of the plate and screws. See also assessment of reduction.

Pearl - Exclude articular penetration of screws

In the illustrated case, the two central locking head screws are very near the joint surface. It is important to make sure such screws do not enter the joint.

An x-ray aimed along the screws helps to show, as it does here, that they do not penetrate the articular cartilage. This is confirmed also by the lateral x-ray.

11. X-ray follow-up at 3 months

Image shows x-ray follow-up of the presented case at 3 months.

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v1.0 2008-12-03