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Laminectomy-induced arachnoradiculitis: a postoperative serial MRI study

H Matsui1, H Tsuji, M Kanamori

  • 1Department of Orthopaedic Surgery, Toyama Medical and Pharmaceutical University, Faculty of Medicine, Japan.

Neuroradiology
|November 1, 1995
PubMed
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Laminectomy surgery can cause spinal adhesions and arachnoid sac shrinkage, potentially leading to post-operative leg symptoms. These effects, investigated via MRI, typically resolve within weeks but highlight the inflammatory nature of spinal wound healing.

Area of Science:

  • Neurosurgery
  • Radiology
  • Spinal Surgery

Background:

  • Degenerative spinal disease often requires surgical intervention like laminectomy.
  • Post-operative complications such as spinal adhesions can impact patient outcomes.

Purpose of the Study:

  • To investigate time-related changes in laminectomy-induced cauda equina adhesions using MRI.
  • To correlate these adhesions and arachnoid sac changes with surgical procedures and potential symptoms.

Main Methods:

  • Ten patients with degenerative spinal disease underwent posterior lumbar surgery.
  • Axial MRI scans were performed pre-operatively and at 3, 7, 21, and 42 days post-operatively.
  • Adhesions and arachnoid sac changes were assessed at laminectomy and non-laminectomy levels.

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Main Results:

  • Cauda equina adhesions were most severe at laminectomized levels (L3-S1), with partial adhesions persisting in 9/16 levels at 6 weeks.
  • At non-laminectomy levels, adhesions resolved by 6 weeks in most cases (5/14 levels with partial adhesions).
  • Arachnoid sac shrinkage occurred at laminectomy sites but re-expanded within 3 weeks; adhesions correlated with laminectomy and discectomy.

Conclusions:

  • Laminectomy, with or without discectomy, is closely correlated with cauda equina adhesions and arachnoid sac shrinkage.
  • These findings suggest an inflammatory deep wound healing process contributing to laminectomy-induced arachnoradiculitis.
  • The observed changes may correlate with post-operative leg symptoms, warranting further investigation.