Biomechanical study of lumbar spinal arthroplasty with a semi-constrained artificial disc (Activ L) in the human cadaveric spine

Sung Kon Ha, Se Hoon Kim, Daniel H. Kim, Jung Yul Park, Dong Jun Lim, Sang Kook Lee

    Research output: Contribution to journalArticlepeer-review

    11 Citations (Scopus)

    Abstract

    Objective: The goal of this study was to evaluate the biomechanical features of human cadaveric spines implanted with the Activ L prosthesis. Methods: Five cadaveric human lumbosacral spines (L2-S2) were tested for different motion modes, i.e. extension and flexion, right and left lateral bending and rotation. Baseline measurements of the range of motion (ROM), disc pressure (DP), and facet strain (FS) were performed in six modes of motion by applying loads up to 8 Nm, with a loading rate of 0.3 Nm/second. A constant 400 N axial follower preload was applied throughout the loading. After the Activ L was implanted at the L4-L5 disc space, measurements were repeated in the same manner. Results: The Activ L arthroplasty showed statistically significant decrease of ROM during rotation, increase of ROM during flexion and lateral bending at the operative segment and increase of ROM at the inferior segment during flexion. The DP of the superior disc of the operative site was comparable to those of intact spine and the DP of the inferior disc decreased in all motion modes, but these were not statistically significant. For FS, statistically significant decrease was detected at the operative facet during flexion and at the inferior facet during rotation. Conclusion: In vitro physiologic preload setting, the Activ L arthroplasty showed less restoration of ROM at the operative and adjacent levels as compared with intact spine. However, results of this study revealed that there are several possible theoretical useful results to reduce the incidence of adjacent segment disease.

    Original languageEnglish
    Pages (from-to)169-175
    Number of pages7
    JournalJournal of Korean Neurosurgical Society
    Volume45
    Issue number3
    DOIs
    Publication statusPublished - 2009

    Keywords

    • Activ L
    • Biomechanics
    • Disc pressure
    • Facet strain
    • Lumbar spinal arthroplasty
    • Range of motion

    ASJC Scopus subject areas

    • Surgery
    • Neuroscience(all)
    • Clinical Neurology

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