![](https://spinehealth.org/wp-content/uploads/2023/01/Figure-3-SImmetry-screws.jpg)
The purpose of the EVoluSIon study is to evaluate the SImmetry Sacroiliac Joint Fusion System for fusion of the SI joint and relief of SI joint pain symptoms. This is a prospective, non-randomized post market study designed to collect data on SI joint fusion and subject back pain following implant of the SImmetry device.