Authors of section

Authors (on behalf of the AOSpine Knowledge Forum Tumor)

Ilya Laufer, JJ Verlaan

General Editor

Luiz Vialle

Open all credits

Percutaneous pedicle screw insertion in the thoracolumbar spine

1. Skin incision

The skin incision is lateral to the image projection of the pedicle. The distance from the skin incision to the image projection varies depending on the various levels of the spine. It also depends on the convergence of the pedicles.

It is necessary to confirm the correct level of the approach with fluoroscopy.

posterior mis

In the middle thoracic spine, the skin incision is close to the image projection of the pedicle in the upper thoracic, and in the lumbar spine it is more lateral.

percutaneous pedicle screw insertion in the thoracolumbar spine

2. Exposure

Using scissors, a blunt dissection of the subcutaneous tissue, the fascia, and the muscles is performed down to the bony structures of the vertebra.

percutaneous pedicle screw insertion in the thoracolumbar spine

Cannulated needles are inserted both at a 3 o' clock on the right side and a 9 o' clock position on the left side.

percutaneous pedicle screw insertion in the thoracolumbar spine

The cannulated needles are tapped in until they reach the medial border of the pedicle image projection.

percutaneous pedicle screw insertion in the thoracolumbar spine

A lateral X-ray is then performed.

If the tip of the needle has not passed the posterior wall of the vertebral body in the lateral projection, retract and reposition the needle.

percutaneous pedicle screw insertion in the thoracolumbar spine

If the tip of the needle has passed the posterior wall of the vertebral body in the lateral projection, the needle can be advanced to the center of the vertebral body.

percutaneous pedicle screw insertion in the thoracolumbar spine

A K-wire is introduced via the cannulated needle. Then, the cannulated needle is removed leaving the K-wire in place.

percutaneous pedicle screw insertion in the thoracolumbar spine

After dilatation of the soft tissue, the cannulated pedicle screw is inserted over the k-wire.

percutaneous pedicle screw insertion in the thoracolumbar spine

These steps are repeated, depending on the number of vertebrae that have to be instrumented.

percutaneous pedicle screw insertion in the thoracolumbar spine

3. Rod placement

The rod is placed percutaneously through a separate stab incision. Depending on the used instrumentation, different techniques are in use.

percutaneous pedicle screw insertion in the thoracolumbar spine

4. Wound closure

For patients undergoing revision metastatic spine tumor surgery and/or with history of radiation, plastic surgery should perform the soft tissue reconstruction to decrease the risk of wound complications.

The wound is closed in layers.

percutaneous pedicle screw insertion in the thoracolumbar spine