Last updated on April 15 2024
Description
A Smith-Petersen osteotomy (SPO) represents the resection of the posterior column between the facet joints at one or multiple levels to accomplish, in most cases, additional lordosis. SPO shortens the posterior column and lengthens the anterior column. Smith-Petersen osteotomies are most helpful for long-sweeping thoracic kyphotic deformities and mild to moderate sagittal imbalances (6 - 8 cm). It allows a 5 - 15° of correction.
Measurements
The measurement made by the procedure is displayed in the image:
- SPO Correction Angle (SPO CA): the angle between the superior and inferior edge of the facet joint.
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 SPO 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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