In vitro load measurement using an instrumented spinal fixation device

Antonius Rohlmann, L. H. Riley, G. Bergmann, F. Graichen

Research output: Contribution to journalArticlepeer-review


An AO spinal fixateur interne was modified to study the effects of a corpectomy on implant performance. A hermetically sealed cartridge containing strain gauges and an inductively powered telemetry unit was integrated into the threaded portion of the original implant. Five cadaveric spines were instrumented with the modified implant spanning a single lumbar vertebra. The spines were tested in axial compression, torsion, flexion, extension and lateral bending. Measurements of the three forces and moments within the implant were performed in the intact spine and repeated following a corpectomy and corpectomy plus complete posterior ligamentous injury. The bending moment increased following corpectomy in all testing modes. The largest increase was in the flexion bending moment, which increased from 155 Nmm to 3328 Nmm following corpectomy.

Original languageEnglish (US)
Pages (from-to)485-488
Number of pages4
JournalMedical Engineering and Physics
Issue number6
StatePublished - Sep 1996
Externally publishedYes


  • Corpectomy
  • Internal fixator
  • Load measurement
  • Spine
  • Telemetry

ASJC Scopus subject areas

  • Biophysics
  • Biomedical Engineering

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