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Decreasing implant load indicates spinal fusion when measured continuously.
Maximilian Heumann1, Lorin Michael Benneker2, Caroline Constant3
1AO Research Institute Davos, Davos, Switzerland; Institute of Orthopaedic Research and Biomechanics, Trauma Research Center Ulm, Ulm University, Ulm, Germany.
Journal of Biomechanics
|January 13, 2024
Summary
A novel sensor system objectively monitors spinal fusion by tracking implant loads, showing a decrease as bone heals. This technology offers real-time data for assessing fusion success after spine surgery.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Spinal Fusion Research
Background:
- Assessing bone union after spinal fusion is challenging.
- Continuous implant load monitoring is a novel approach for objective fusion assessment.
Purpose of the Study:
- To systematically investigate a novel sensor concept for monitoring spinal fusion.
- To evaluate the sensor's ability to track fusion progression in a sheep model.
Main Methods:
- Sheep underwent spinal fusion surgery at L2-L3 and L4-L5 levels.
- Sensing devices monitored pedicle-screw-rod construct loads for 16 weeks.
- Post-study analysis included biomechanical testing and CT scans to confirm fusion.
Main Results:
- Implant loads initially increased, peaking around week 4, then decreased to 52 ± 9% by study end.
- Fusion was confirmed in all segments via bone bridging and limited motion (<0.7°).
- One sensor was affected by bone ingrowth, indicating a need for design refinement.
Conclusions:
- Continuous implant load monitoring provides objective, real-time data on spinal fusion progression.
- This sensor concept offers a valuable alternative to traditional imaging techniques.
- Further development and validation are needed for human spine applications.
