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Can the Stand-Alone Cervical Interfacet Fusion Achieve Spinal Stability? A Comprehensive Finite Element Analysis
Luca Ciriello1, Margherita Rotondi1, Giuseppe J Sciarrone2
1Department of Chemistry, Materials and Chemical Engineering "Giulio Natta" - LaBS, Politecnico di Milano, Milan, Italy.
International Journal of Spine Surgery
|March 10, 2026
Summary
Cervical interfacet fusion system (CIFS) alone offers a cost-effective alternative for cervical spine surgery, preserving mobility. However, careful patient selection is crucial to mitigate risks like pseudarthrosis and adjacent segment degeneration.
Area of Science:
- Biomechanical analysis of spinal fusion techniques.
- Finite element modeling in orthopedic surgery.
Background:
- Degenerative cervical spine conditions often involve facet and disc issues, causing instability.
- Cervical interfacet fusion system (CIFS) is a surgical option, often paired with anterior disc cages.
- The necessity of anterior disc cages in conjunction with CIFS is debated due to increased surgical complexity and risks.
Purpose of the Study:
- To biomechanically evaluate the efficacy of CIFS alone versus CIFS combined with an anterior disc cage.
- To assess the impact of these surgical strategies on cervical spine stability and adjacent segment health using a finite element model.
Main Methods:
- A validated C2-C7 finite element model was used to simulate three surgical scenarios: anterior disc cage alone, CIFS alone, and CIFS with an anterior disc cage.
- Simulations were conducted on treated levels (C4-C5, C5-C6, C4-C6) under various loading conditions (flexion, extension, axial rotation, lateral bending).
Main Results:
- CIFS alone preserved some motion at treated levels, maintaining range of motion within normal limits and reducing intradiscal pressure at treated and adjacent levels.
- Anterior disc cage alone and CIFS with an anterior disc cage eliminated motion but increased hypermobility and intradiscal pressure at adjacent levels.
- CIFS alone showed a higher risk of pseudarthrosis due to residual motion, while other models posed risks to adjacent segments.
Conclusions:
- CIFS alone presents a cost-effective surgical option for the cervical spine that preserves physiological motion.
- Careful patient selection and postoperative rehabilitation are essential to minimize risks associated with CIFS, such as pseudarthrosis and adjacent segment degeneration.
- The findings suggest CIFS alone can be a viable alternative, balancing stability with preserved mobility.
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