A Transducer for Measuring Motion within a Vertebra

Evenson, R; Budney, D; Moreau, Maxim; Raso, V.J.

doi:10.1097/00007632-199006000-00027

Cited by 1 publication

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“…In recent years, other imaging analyses and biomechanical measurements have been attempted for the diagnosis of lumbar segmental instability, including measurement of axial rotation using preoperative images on computer tomography or magnetic resonance imaging [16][17][18][19], motion analysis with electrogoniometry [20] or videofluoroscopy [21], and measurement of intraoperative spinal motion stiffness using a strain gauge [6] or transducer [22]. These methods, however, have not become widespread due to difficulties such as the time required to obtain results and the need for specialised instruments.…”

Section: Discussionmentioning

confidence: 99%

Clinical application of a handy intraoperative measurement device for lumbar segmental instability

Kasai

Inaba

Kato

et al. 2009

International Orthopaedics (SICOT)

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We describe the development of a new device that permits handy intraoperative measurement of lumbar segmental instability. The subjects comprised 80 patients with lumbar degenerative disease. Relationships between preoperative radiological assessments and extended distance as measured using our new device were investigated. Mean extended distance measured using the device was 3.7± 1.9 mm. Correlation coefficients between angular motion and extended distance, and translational motion and extended distance were 0.76 and 0.66, respectively, revealing significant positive relationships between these values (p<0.01 each). The correlation coefficient between the intervertebral endplate angle on the flexion film and extended distance was −0.78, showing a significant negative relationship (p<0.01). In conclusion, the device for intraoperative measurement of lumbar segmental instability that we have developed appears to permit simple measurement of intervertebral instability and provides operators with valuable information for selecting operative methods of spinal fusion or instrumentation.

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