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European Spine Journal

, Volume 18, Issue 4, pp 465–470 | Cite as

Biomechanical evaluation of segmental instability in degenerative lumbar spondylolisthesis

  • Kazuhiro HasegewaEmail author
  • Ko Kitahara
  • Toshiaki Hara
  • Ko Takano
  • Haruka Shimoda
Original Article

Abstract

Here we investigated the biomechanical properties of spinal segments in patients with degenerative lumbar spondylolisthesis (DLS) using a novel intraoperative measurement system. The measurement system comprised spinous process holders, a motion generator, a load cell, an optical displacement transducer, and a computer. Cyclic displacement of the holders produced flexion-extension of the segment with all ligamentous structures intact. Stiffness, absorption energy (AE), and neutral zone (NZ) were determined from the load-deformation data. Forty-one patients with DLS (M/F = 15/26, mean age 68.6 years; Group D) were studied. Adjacent segments with normal discs in six patients (M/F = 3/3, mean age 35 years) were included as a control group (Group N). Flexion stiffness was significantly lower in Group D than in Group N. The NZ, however, was significantly greater in Group D than in Group N. Thus, compared to normal segments, spinal segments with DLS had a lower flexion stiffness and a higher NZ. NZs in Group D were, however, widely distributed compared to those in Group N that showed NZ <2 mm/N in all cases, suggesting that the segment with DLS is not always unstable and that the segments with NZ >2 mm/N can be considered as unstable.

Keywords

Intraoperative biomechanical analysis Lumbar degenerative spondylolisthesis Segmental instability 

Notes

Conflict of interest statement

No grant or any other funding has been recieved.

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Kazuhiro Hasegewa
    • 1
    Email author
  • Ko Kitahara
    • 2
  • Toshiaki Hara
    • 3
  • Ko Takano
    • 1
  • Haruka Shimoda
    • 1
  1. 1.Niigata Spine Surgery CenterNiigataJapan
  2. 2.Showa Ikakogyou CoToyohashiJapan
  3. 3.Faculty of EngineeringNiigata UniversityNiigataJapan

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