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Natural Experiments as a Study Method in Spinal Trauma Surgery: A Systematic Review.
Agnita Stadhouder1, Luke Xander van Rossenberg2,3, Charlotte Kik4
1Department of Orthopaedics and Sports Medicine, Amsterdam University Medical Centers, Amsterdam, Netherlands.
Global Spine Journal
|December 11, 2023
Summary
Natural experiment designs offer a valuable research approach in spinal trauma care, particularly when randomized controlled trials are not feasible. This methodology shows promise for addressing complex clinical questions in the field.
Area of Science:
- Orthopedics and Traumatology
- Research Methodology
Background:
- Spinal trauma research often faces challenges with randomized controlled trials (RCTs) due to ethical and practical constraints.
- The natural experiment design presents a potential alternative for investigating treatment modalities in spinal trauma.
Purpose of the Study:
- To evaluate the utility of the natural experiment design in spinal trauma care.
- To assess its viability as an alternative to RCTs when they are infeasible or unethical.
Main Methods:
- A systematic review of Medline, Embase, and Cochrane databases (2004-2023) was conducted.
- Included studies utilized a natural experiment design comparing spinal trauma treatment modalities.
- Data extraction and quality assessment were performed using the MINORS criteria.
Main Results:
- Four studies employing a natural experiment design in traumatic spinal fractures were identified.
- Studies primarily focused on operative treatments or antibiotic strategies, with high MINORS scores (12-17).
- Comparability of patient groups was noted as high across the included studies.
Conclusions:
- The natural experiment design has been infrequently used in spinal trauma research since 2004.
- This methodology demonstrates potential for addressing complex clinical issues in spinal trauma where RCTs are not viable.
- Increased consideration of natural experiment designs is recommended for future spinal trauma research.

