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Executive Editor: Luiz Vialle General Editor: German Ochoa (in memoriam)

Authors: Alex Vaccaro, Frank Kandziora, Michael Fehlings, Rajasekaran Shanmughanathan

Thoracic and lumbar trauma - A3

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Glossary

1 Introduction top

Thoracic and lumbar fractures: Posterior short segment fixation with pedicle screws enlarge

Preliminary remarks

A3 injuries are compression injuries of the vertebral body involving only one endplate and associated with a fracture of the posterior wall of the vertebral body. Due to axial compression forces, vertical fracture of the lamina can be present and does not indicate a tension band failure.


Decompression

In cases where neurological deficit is observed and compression of the spinal canal is assumed, decompression has to be performed. It should be understood that this is a step that can also result in deterioration of neurology unless very meticulously performed.
Decompression can be performed anteriorly or posteriorly. Posteriorly, decompression can be indirect or direct. Indirect decompression may be tried before performing direct decompression.  Please refer to Decompression techniques for a detailed discussion of indications for posterior decompression techniques.

2 Closed reduction top

Thoracic and lumbar fractures: Posterior short segment fixation with pedicle screws enlarge

Primary reduction is performed by positioning of the patient onto a frame to create lordosis.

3 Reduction with pedicle screws top

Thoracic and lumbar fractures: Posterior short segment fixation with pedicle screws enlarge

Preliminary remarks

Due to the fact that bilateral instrumentation is necessary in all cases, all steps described below are repeated on the opposite side, unless described otherwise.


Thoracic and lumbar fractures: Posterior short segment fixation with pedicle screws enlarge

Pedicle screw insertion

Most A3 fractures can be managed by posterior short segment fixation with pedicle screws alone.

Pedicle screws are inserted into the vertebrae cephalad and caudal to the fracture level on both sides. Mono- or polyaxial, top- or side loading screws can be used in any combination. ( Pedicle Screw Insertion)


Thoracic and lumbar fractures: Posterior short segment fixation with pedicle screws enlarge

Rod contouring

The contouring of the rod depends on the site of the fracture following the natural curvature of the spine. A rod contoured in mild kyphosis is chosen for fractures from T1-T10. A straight or a slightly lordotic rod is chosen for fractures from T11-L1 as illustrated, and a rod contoured to lordosis is chosen for lumbar fractures.


Thoracic and lumbar fractures: Posterior short segment fixation with pedicle screws enlarge

Rod insertion

The rods are introduced to the distal screw heads on both sides and tightened.


Thoracic and lumbar fractures: Posterior short segment fixation with pedicle screws enlarge

The rod is then inserted into the proximal screw heads without tightening.


Thoracic and lumbar fractures: Posterior short segment fixation with pedicle screws enlarge

Decompression

If it is decided to perform an indirect decompression, this is done at this stage. If indirect decompression proves to be insufficient, a direct decompression eg, posterior or transpedicular decompression are undertaken. Refer to the Posterior Decompression techniques for detailed instructions. ( Posterior Decompression)


Thoracic and lumbar fractures: Posterior short segment fixation with pedicle screws enlarge

Distraction (ligamentotaxis)

With the help of a distractor, the proximal screws are distracted along the rod. This is done on both sides simultaneously.


Thoracic and lumbar fractures: Posterior short segment fixation with pedicle screws enlarge

The screw heads are tightened with the inner nuts to secure the reduction achieved.


Thoracic and lumbar fractures: Posterior short segment fixation with pedicle screws enlarge

The final construct is shown from a lateral view.

4 Fusion top

Decision

Although fusion was routinely performed for all spinal fractures, its indications are now being restricted to fractures that are highly unstable.

Nonfusion fixations can be performed for A3, A4, and B1 type injuries. Fusion is routinely performed for A2, B2, B3 and all C injuries as they are unstable injuries with extensive soft tissue and ligamentous disruption.


Thoracic and lumbar fractures: Posterior short segment fixation with pedicle screws enlarge

Nonfusion

For nonfusion surgeries, the facet joint capsule is preserved during the entire procedure.

The screws can be removed after 9 months once the fracture has healed.

5 Intraoperative imaging top

Thoracic and lumbar fractures: Posterior short segment fixation with pedicle screws enlarge

Prior to wound closure, intraoperative imaging is performed to check the adequacy of reduction, position, and length of screws and the overall coronal and sagittal spinal alignment.

v1.0 2014-12-99