Last updated on April 15 2024
Description
A pedicle subtraction osteotomy (PSO) refers to doing a V-shaped resection through the posterior elements, pedicles, and vertebral bodies. The posterior element, pedicle, and vertebral body are resected and closed bone-on-bone from anterior to posterior. Pedicle subtraction osteotomies are most helpful for patients with a substantial sagittal imbalance of >10 to 12 cm and sharp angular lumbar kyphosis. It allows a 20 - 40° correction.
Measurements
The measurement made by the procedure is displayed in the image:
- PSO Correction angle (PSO CA): angle between the superior and inferior edge of the pedicle.
How to perform
After selecting this procedure in the sidebar, you must mark the points to conclude it. To see the caption of each point you need to click on this button 
Beware: you can change the position of the points at this stage or later. To do this, simply click on each handle with the left mouse button and move them to the most suitable position.
For advanced configuration please follow the instructions below
Advanced Configuration
After the correct positioning of the PSO procedure, it is possible to perform a cut automatically using this option on Object edition, to restore the patient's anatomical alignment.
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