## Introduction
Up to **25% of all chronic low back pain** cases actually originate not in the spine, but in the **Sacroiliac (SI) Joint**. Historically ignored, the SI joint is now a major target for intervention. The emergence of **Minimally Invasive SI Joint Fusion** has provided a solution for patients who have failed conservative therapy.
## The SI Joint Challenge
The SI joint is a large, irregularly shaped joint that connects the spine to the pelvis. It only moves a few millimeters, but if it becomes unstable (SI joint dysfunction), every step can be painful.
## Benefits of the Minimally Invasive Approach
Traditional open fusion was extremely traumatic. Modern **SI Screw Systems** allow for:
* **Telescoping Fixation:** Large-diameter, porous screws are driven across the joint through a 3cm incision.
* **Immediate Stability:** The threads provide instant mechanical “locking” of the joint.
* **Biological Success:** These screws are often 3D-printed with a trabecular surface to encourage bone to grow across the joint.
## Technical Specifications
Ortholyx SI Fusion Screws are:
1. **Cannulated:** Inserted over a guide wire for sub-millimeter precision under X-ray.
2. **Fenestrated:** Allowing for the injection of bone graft material through the center of the screw.
3. **High Torque:** Designed to drive into the dense cortical bone of the ilium.
## Conclusion
SI joint fusion is one of the fastest-growing segments in orthopedics. By utilizing Ortholyx’s minimally invasive screw systems, surgeons can provide a life-changing cure for chronic back pain with minimal patient downtime.