A proposed technique for intraoperative measurement of cervical spine stiffness

Edmund Frank, David Chamberland, Brian Ragel

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

OBJECTIVE: Classically cervical biomechanical data have been obtained using cadaver models. Few methods exist for in vivo measurement of cervical biomechanics. A technique for intraoperative measurement of cervical motion segment stiffness (load-axial displacement) has been developed, enabling load/displacement data to be obtained during surgery at the spinal levels operated on and at adjacent cervical levels. METHODS: The instrument used for measuring motion segment stiffness was a vertebral retractor equipped with displacement and strain transducers and designed to be placed over the shafts of Caspar distraction screws. Stiffness was measured under simulated anterior cervical surgical conditions. RESULTS: A preliminary study deciphering axial cervical spine load/displacement data on 12 cadavers was performed with this instrument. Using a distraction load of 88.8640 N, axial displacements of 2.110 ± 0.258 mm (mean ± standard error of the mean) at C3-C4, 2.367 ± 0.304 mm at C4-C5, and 2.207 ± 0.238 mm at C5-C6 were found. When data were evaluated for age, there was a significant decrease in stiffness with advancing age in two of the three spinal segments tested (P <0.05 for C3- C4, P <0.04 for C4-C5, P <0.12 for C5-C6), which correlated with previous studies. CONCLUSION: These results suggest that this technique may be useful in assessing intraoperative motion-segment stability.

Original languageEnglish (US)
Pages (from-to)147-150
Number of pages4
JournalNeurosurgery
Volume39
Issue number1
DOIs
StatePublished - Jul 1996

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Spine
Cadaver
Transducers
Biomechanical Phenomena

Keywords

  • Intraoperative measurement
  • Load displacement curve
  • Spinal instability
  • Stiffness

ASJC Scopus subject areas

  • Clinical Neurology
  • Surgery

Cite this

A proposed technique for intraoperative measurement of cervical spine stiffness. / Frank, Edmund; Chamberland, David; Ragel, Brian.

In: Neurosurgery, Vol. 39, No. 1, 07.1996, p. 147-150.

Research output: Contribution to journalArticle

Frank, Edmund ; Chamberland, David ; Ragel, Brian. / A proposed technique for intraoperative measurement of cervical spine stiffness. In: Neurosurgery. 1996 ; Vol. 39, No. 1. pp. 147-150.
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