AOTrauma Webinar:  Why Do Patients Get Infection?

May 30, 2017 14:00 CET

Main Presenter: Olivier Borens, MD (Switzerland)
Chat Moderator: Stephen Kates, MD (USA)

Surgical site infections after trauma are debilitating and costly. They are feared by the surgeon and the patient alike. The incidence of this complication can be decreased by proper preoperative, intraoperative, and postoperative management.
The goal of this webinar is to present easy-to-use tools and strategies that will lead to a decrease in the incidence of infection.

More information and registration...

Infection

Executive Editor: Chris Colton

Authors: Peter V Giannoudis, Hans Christoph Pape, Michael Sch├╝tz

Femur shaft 32-C1 CRIF subtrochanteric

back to skeleton

Glossary

1 Principles top

Principles enlarge

Important module-wide statement

Where appropriate, a “generic” fracture zone will be illustrated and not necessarily the specific fracture morphology under consideration. Where the fracture morphology determines the fixation technique, the specific morphology will be shown.


Principles enlarge

Bridge plating

Bridge plating uses the plate as an extramedullary splint, fixed to the two main fragments, leaving the intermediate fracture zone untouched. Anatomical reduction of intermediate fragments is not necessary. Furthermore, their direct manipulation would risk disturbing their blood supply. If the soft tissue attachments to the fragments are preserved, and the fragments are relatively well aligned, healing is enhanced.

Alignment of the main shaft fragments can be achieved indirectly with the use of traction and the support of indirect reduction tools, or indirectly via the implant.

Mechanical stability, provided by the bridging plate, is adequate for gentle functional rehabilitation and results in satisfactory indirect healing (callus formation). Occasionally, a larger wedge fragment might be approximated to the main fragments with a lag screw.


Principles enlarge

Bridge plate insertion

Bridge plates can be inserted either with an open exposure that respects soft-tissue attachments to the fractures, or through a minimally invasive (MIO) approach that leaves the soft tissues intact over the fracture site. In this case, incisions are made proximally and distally, and the plate is inserted through a submuscular tunnel. This normally requires fluoroscopic intensifier monitoring.


Reduction

It is important to restore axial alignment, length, and rotation.

Reduction can be performed with a single reduction tool (eg, large distractor), or by combining several steps (for example fracture table +/- external fixator, +/- reduction via the implant, etc.) to achieve the final reduction.

The preferred method depends on the fracture and soft-tissue injury pattern, the chosen stabilization device, and the experience and skills of the surgeon.

If a large fragment has separated from the fracture zone and impaled the adjacent muscle, direct reduction may be required.

2 Preliminary reduction top

Preliminary reduction enlarge

General considerations

Subtrochanteric fractures present a particular problem in terms of fracture reduction and alignment. Due to the strong pull of the iliopsoas muscle, the proximal fragment is flexed and externally rotated and therefore difficult to control. This may even require open reduction maneuvers in order to ensure a proper alignment.

If a closed plating technique is used, a preliminary reduction should be undertaken before plate insertion. Once the plate is attached to the proximal fragment, the definitive reduction with respect to length, rotation and axis can be achieved.

For the preliminary reduction several options are available:

  • Lowering the proximal fragment by using external pressure with a mallet.
  • A Schanz screw inserted into one of the main fragments.
  • Use of a distractor / external fixator.

Preliminary reduction enlarge

The proximal fragment is flexed and externally rotated by the iliopsoas muscle.


Preliminary reduction enlarge

Extension of the flexed proximal fragment by use of a mallet

A mallet may be used, but this will be difficult if the proximal fragment is short.


Preliminary reduction enlarge

A Schanz screw inserted into one of the main fragments

A monocortical Schanz screw can be helpful in providing direct control of the displaced main fragments. It is advantageous when compared with reduction maneuvers through the skin.


Preliminary reduction enlarge

Use of a large distractor

After placement of two pins - one in the greater trochanter and the other in the shaft - the large distractor is attached. Attention has to be paid so that the pins do not conflict with the later plate position.

In case of a closed procedure, every step of the reduction should be verified by image intensifier control.

The preliminary reduction is held by tightening the clamps of the large distractor.

3 Preoperative planning top

Preoperative planning enlarge

Plate length and number of screws

Depending on the extent of the zone of fracture comminution and the underlying bone stock (osteoporosis), the appropriate plate length is chosen. Sufficient bicortical screws (a minimum of three up to six) should be inserted in each fracture fragment. Relative stability results from leaving plate holes empty over the fracture zone.

4 Plate fixation to proximal fragment top

Plate fixation to proximal fragment enlarge

Guide wire insertion

As a first step, a guide wire for the condylar screw is inserted proximally.

The aiming device is lined up parallel to the femoral neck in both the axial, and the AP views, the guide wire is aimed at the lower portion to the femoral head. The position has to be checked in two planes under image intensifier control.


Plate fixation to proximal fragment enlarge

Reaming

After indirect measurement of the guide wire insertion depth using the measuring device, drilling is performed over the guide wire with a triple reamer, adjusted to the correct length.


Plate fixation to proximal fragment enlarge

Preliminary screw insertion

The following steps are recommended for the minimally invasive technique.

First, the condylar screw is inserted so that its outer end is still visible outside the lateral cortex.


Plate fixation to proximal fragment enlarge

Plate placement

Next, the T-handle is detached and the plate is inserted submuscularly from proximal to distal.


Plate fixation to proximal fragment enlarge

Pearl: preparation of the plate tunnel

Three options are in use for preparation of the plate path in the distal main fragment.

  1. Insert a long pair of scissors, spread them, and then pull backwards.
  2. Insert a periosteal elevator and slide it extraperiosteally along the distal main fragment. (The tip of the plate can be used in a same manner).
  3. A soft-tissue retractor is available which serves the same purpose (as illustrated).

Plate fixation to proximal fragment enlarge

Plate and screw combination

The T-handle is then inserted through the barrel of the plate and reconnected to the condylar screw. This can be challenging and often requires abandoning the preliminary reduction.


Plate fixation to proximal fragment enlarge

Final screw placement

When the screw is in the final position (when the T-handle is parallel to the long axis of the proximal shaft fragment in the lateral view), the barrel is placed fully over the screw, and the T-handle then removed.


Plate fixation to proximal fragment enlarge

Plate fixation with cortical screw

After verification of the correct plate position, a cortical screw is inserted to secure the plate to the proximal fragment.

5 Plate fixation to distal fragment top

Plate fixation to distal fragment enlarge

Verification of reduction

Under image intensifier control, the preliminary reduction is again checked with respect to axial alignment, and length and, to a degree, the rotation (in more complex fractures, judging the clinical accuracy of the rotation becomes more important, while at the same time the associated radiological findings can be challenging to interpret).


Plate fixation to distal fragment enlarge

The illustration shows the distal main fragment incompletely aligned.


Plate fixation to distal fragment enlarge

Insertion of first screw into distal fragment

The approaches / stab incisions over the distal fragment are made according to the planned final screw placement.

Two blunt Hohmann retractors placed ventrally and dorsally around the femoral shaft can help to control the lateral position of the plate.

If the overall reduction is found to be sufficient, the first cortical screw in the distal fragment is placed without being fully tightened. This allows additional fine tuning of the plate position.


Plate fixation to distal fragment enlarge

Pearl: final reduction

If the fracture fragments are incompletely reduced laterally, the use of sterile bolsters is recommended.


Plate fixation to distal fragment enlarge

Insertion of second screw into distal fragment

Once the most distal screw has been inserted, the first screw in the distal main fragment is fully tightened.


Plate fixation to distal fragment enlarge

Additional screw placement

According to preoperative planning, additional screws are inserted into the proximal and distal main fragments.

v1.0 2007-12-02