title: Clinical application of a handy intraoperative measurement device for lumbar segmental instability.
abstract: 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.
authors.affiliation: Department of Orthopaedic Surgery, Mie University Graduate School of Medicine, 2-174 Edobashi, Tsu City, Mie Prefecture 514-8507, Japan. ykasai@clin.medic.mie-u.ac.jp
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Kasai
authors.forename: Tadashi
authors.initials: T
authors.lastname: Inaba
authors.forename: Takaya
authors.initials: T
authors.lastname: Kato
authors.forename: Koji
authors.initials: K
authors.lastname: Akeda
authors.forename: Atsumasa
authors.initials: A
authors.lastname: Uchida
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D007405:Intervertebral Disc Displacement / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery; D007593:Joint Instability / Q000000981:diagnostic imaging / Q000503:physiopathology* / Q000601:surgery; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging / Q000503:physiopathology* / Q000601:surgery; D008297:Male; D008875:Middle Aged; D016343:Monitoring, Intraoperative / Q000295:instrumentation* / Q000379:methods; D011859:Radiography; D013122:Spinal Diseases / Q000000981:diagnostic imaging / Q000503:physiopathology* / Q000601:surgery; D013123:Spinal Fusion / Q000295:instrumentation* / Q000379:methods; D013130:Spinal Stenosis / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery; D013168:Spondylolisthesis / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery; D055815:Young Adult