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A new improved method for assessing brain deformation after decompressive craniectomy.

Tim L Fletcher¹, Angelos G Kolias², Peter J Hutchinson²

¹Department of Engineering, University of Cambridge, Cambridge, United Kingdom.

|October 11, 2014

Summary

Decompressive craniectomy (DC) reduces brain deformation, particularly bifrontal DC, which shows significantly lower herniation volume and displacement compared to unilateral DC. This study validates a new method for quantifying these changes using CT scans.

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Area of Science:

Neurosurgery
Medical Imaging
Biomechanics

Background:

Decompressive craniectomy (DC) is a critical intervention for managing elevated intracranial pressure after traumatic brain injury.
The clinical effectiveness of DC is debated, with potential variations based on surgical location (unilateral vs. bifrontal).
Existing methods for assessing brain deformation post-DC have limitations, necessitating improved techniques.

Purpose of the Study:

To develop and validate a novel method for quantifying brain deformation following decompressive craniectomy using CT imaging.
To compare brain deformation between unilateral and bifrontal DC procedures.
To investigate the relationship between brain deformation, herniation volume, and craniectomy area.

Main Methods:

Computed tomography (CT) scans from 27 patients (17 bifrontal, 10 unilateral DC) were analyzed.

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Pre- and post-operative images were registered to quantify changes in brain position, volume, and deformation.

Statistical analyses included Pearson's correlation and Welch's two-tailed T-test.

Main Results:

A moderate correlation was found between increased herniation volume and maximum brain displacement (r=0.64).
Bifrontal DC resulted in significantly lower maximum deformation (22.5 mm) and herniation volume (50.0 ml) compared to unilateral DC (29.8 mm, 107.3 ml).
No significant difference in craniectomy area was observed between the two surgical approaches.

Conclusions:

A validated CT-based method allows for the quantification and comparison of brain deformation after decompressive craniectomy.
Bifrontal DC appears to induce less brain deformation and herniation compared to unilateral DC.
Brain displacement serves as a reliable indicator for characterizing volume changes post-DC.