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Stabilising effect of dynamic interspinous spacers in degenerative low-grade lumbar instability

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Abstract

The aim of the study was to investigate the stabilising effect of dynamic interspinous spacers (IS) in combination with interlaminar decompression in degenerative low-grade lumbar instability with lumbar spinal stenosis and to compare its clinical effect to patients with lumbar spinal stenosis in stable segments treated by interlaminar decompression only. Fifty consecutive patients with a minimum age of 60 years were scheduled for interlaminar decompression for clinically and radiologically confirmed lumbar spinal stenosis. Twenty-two of these patients (group DS) with concomitant degenerative low-grade lumbar instability up to 5 mm translational slip were treated by interlaminar decompression and additional dynamic IS implantation. The control group (D) with lumbar spinal stenosis in stable segments included 28 patients and underwent only interlaminar decompression. The mean follow-up was 46 months in group D and 44 months in group DS. A visual analogue scale (VAS), Oswestry Disability Index (ODI) and walking distance were evaluated pre- and postoperatively. The segmental instability was evaluated in flexion-extension X-rays. The implantation of an IS significantly reduced the lumbar instability on flexion-extension X-rays. At the time of follow-up walking distance, VAS and ODI showed a significant improvement in both groups, but no statistical significance between groups D and DS. Four patients each in groups D and DS had revision surgery during the period of evaluation. The stabilising effect of dynamic IS in combination with interlaminar decompression offers an opportunity for an effective treatment for degenerative low-grade lumbar instability with lumbar spinal stenosis.

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The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, Vienna General Hospital, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria

    Johannes Holinka, Petra Krepler, Michael Matzner & Josef G. Grohs

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  1. Johannes Holinka
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  2. Petra Krepler
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  3. Michael Matzner
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  4. Josef G. Grohs
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Correspondence to Johannes Holinka.

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Holinka, J., Krepler, P., Matzner, M. et al. Stabilising effect of dynamic interspinous spacers in degenerative low-grade lumbar instability. International Orthopaedics (SICOT) 35, 395–400 (2011). https://doi.org/10.1007/s00264-010-1017-5

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  • DOI: https://doi.org/10.1007/s00264-010-1017-5

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