Journal
ANNALS OF BIOMEDICAL ENGINEERING
Volume 44, Issue 12, Pages 3495-3509Publisher
SPRINGER
DOI: 10.1007/s10439-016-1666-7
Keywords
Neurosurgery; FE analysis; Brain injury
Categories
Funding
- Engineering and Physical Sciences Research Council (EPSRC)
- Studienstiftung des deutschen Volkes
- Max Weber-Programm
- Stiftung Maximilianeum
- Royal College of Surgeons of England Research Fellowship
- Freemasons
- Rosetrees Trust
- National Institute of Health Research (NIHR) Academic Clinical Fellowship
- Raymond and Beverly Sackler Studentship
- NIHR Research Professorship
- NIHR Cambridge Biomedical Research Centre
- MRC [G0601025] Funding Source: UKRI
- Medical Research Council [G0601025] Funding Source: researchfish
- National Institute for Health Research [12/35/57, NIHR-RP-R3-12-013] Funding Source: researchfish
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Hyperelastic finite element models, with either an idealized cylindrical geometry or with realistic craniectomy geometries, were used to explore clinical issues relating to decompressive craniectomy. The potential damage in the brain tissue was estimated by calculating the volume of material exceeding a critical shear strain. Results from the idealized model showed how the potentially damaged volume of brain tissue increased with an increasing volume of brain tissue herniating from the skull cavity and with a reduction in craniectomy area. For a given herniated volume, there was a critical craniectomy diameter where the volume exceeding a critical shear strain fell to zero. The effects of details at the craniectomy edge, specifically a fillet radius and a chamfer on the bone margin, were found to be relatively slight, assuming that the dura is retained to provide effective protection. The location in the brain associated with volume expansion and details of the material modeling were found to have a relatively modest effect on the predicted damage volume. The volume of highly sheared material in the realistic models of the craniectomy varied roughly in line with differences in the craniectomy area.
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