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Patient-specific spinal stiffness in AIS: a preoperative and noninvasive method

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An Erratum to this article was published on 25 February 2015

Abstract

Introduction

The clinical tests currently used to assess spinal biomechanics preoperatively are unable to assess true mechanical spinal stiffness. They rely on spinal displacement without considering the force required to deform a patient’s spine. We propose a preoperative method for noninvasively quantifying the three-dimensional patient-specific stiffness of the spines of adolescent idiopathic scoliosis patients.

Methods

The technique combines a novel clinical test with numerical optimization of a finite element model of the patient’s spine.

Results

A pilot study conducted on five patients showed that the model was able to provide accurate 3D reconstruction of the spine’s midline and predict the spine’s stiffness for each patient in flexion, bending, and rotation. Statistically significant variation of spinal stiffness was observed between the patients.

Conclusion

This result confirms that spinal biomechanics is patient-specific, which should be taken into consideration to individualize surgical treatment.

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Acknowledgments

This work was supported by the Swiss National Science Foundation (SNSF) via the project 320030 138527.

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Correspondence to Steve Berger.

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Berger, S., Marcello, O., Schuman, S. et al. Patient-specific spinal stiffness in AIS: a preoperative and noninvasive method. Eur Spine J 24, 249–255 (2015). https://doi.org/10.1007/s00586-014-3623-1

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  • DOI: https://doi.org/10.1007/s00586-014-3623-1

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