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Cranial Bones: Lateral View01:27

Cranial Bones: Lateral View

The lateral view of the cranium is dominated by temporal, sphenoid, and ethmoid bones.
The temporal bone forms the lower lateral side of the skull. The temporal bone is subdivided into several regions. The flattened upper portion is the squamous portion of the temporal bone. Below this area and projecting anteriorly is the zygomatic process of the temporal bone, which forms the posterior portion of the zygomatic arch. Posteriorly is the mastoid portion of the temporal bone. Projecting...
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Cranial Bones: Superior and Posterior View01:14

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A Large Lateral Craniotomy Procedure for Mesoscale Wide-field Optical Imaging of Brain Activity
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Do expansile cranial springs erode through the cranium?

Charles Davis1, Per Windh, Claes G K Lauritzen

  • 1Central and Southern New Zealand Craniofacial Program, Wellington, New Zealand. info@craniofacialsurgery.co.nz

The Journal of Craniofacial Surgery
|January 24, 2009
PubMed
Summary

Expansile cranial springs used for craniosynostosis can cause minor bone erosion. This erosion, however, was found to be of minimal clinical significance in an animal model, not affecting overall cranial expansion.

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Area of Science:

  • Craniofacial surgery
  • Pediatric neurosurgery
  • Biomedical engineering

Background:

  • Craniosynostosis requires surgical intervention to correct abnormal skull shape.
  • Expansile cranial springs are utilized in specific craniosynostosis cases to facilitate skull expansion.
  • The force exerted by these springs on the thin skull raises concerns about potential bone erosion.

Purpose of the Study:

  • To investigate the occurrence and extent of bone erosion caused by expansile cranial springs.
  • To assess the clinical significance of any observed bone erosion in relation to cranial expansion.
  • To evaluate the efficacy of spring-based treatment in an animal model of craniosynostosis.

Main Methods:

  • New Zealand white rabbits underwent sagittal suturectomy and spring insertion, with amalgam markers placed to track potential erosion.
  • A control group received only sagittal suturectomy.
  • Radiological evaluation was conducted over 7 weeks to monitor spring foot migration and erosion.

Main Results:

  • The mean cranial thickness at spring insertion was 1.4 mm.
  • Spring-induced cranial width increase was 11.02 mm versus 0.23 mm in controls (P < 0.001).
  • Bone erosion occurred at 20% of spring ends, averaging 0.18 mm (3.2% of cranial expansion), with no statistical impact on expansion.

Conclusions:

  • The forces necessary for effective cranial expansion using springs may lead to some bone erosion.
  • In this animal model, the observed degree of bone erosion demonstrated minimal clinical significance.
  • Further research may be warranted to optimize spring design and application to minimize erosion while maximizing expansion.