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Postoperative MRI findings 5 years after lumbar microdiscectomy

Abstract

Background

Lumbar microdiscectomy is a common procedure with satisfactory results; however, postoperative events like progressive adjacent level degeneration and perineural fibrosis can contribute to long-term pain. The purpose of the study was to evaluate MRI changes 5 years after lumbar microdiscectomy and assess their association with clinical parameters.

Materials and methods

A prospective study enrolling 61 patients who underwent microdiscectomy. Changes between preoperative and postoperative MRI findings were recorded, and these findings were tested for associations with demographic, clinical and perioperative parameters. The measured imaging parameters were degeneration of the operated and adjacent discs and endplates, morphology of the disc herniation, facet joints arthritis and the presence of postoperative perineural fibrosis.

Results

Statistically significant differences were found between preoperative and postoperative morphology of the operated disc, facet joints arthritis and degeneration of the operated and caudal adjacent disc. There were no differences between preoperative and postoperative disc degeneration of the superior adjacent disc and in degeneration of the operated and adjacent endplates. Postoperatively perineural fibrosis was common; however, thecal sac compression and nerve root impingement were reduced. Age at the time of surgery was the only parameter associated with postoperative changes.

Conclusion

Five years after microdiscectomy, several postoperative MRI changes including operated disc’s morphology, facet joints arthritis and degeneration of the operated and caudal adjacent disc were shown. Taking into consideration that participants were on average middle-aged, these changes could be attributed not only to the impact of the surgery but also to the natural history of lumbar spine degeneration.

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Correspondence to Evangelos I. Papanastasiou.

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The authors declare that they have no conflict of interest.

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Gelalis, I.D., Papanastasiou, E.I., Theodorou, D.J. et al. Postoperative MRI findings 5 years after lumbar microdiscectomy. Eur J Orthop Surg Traumatol 29, 313–320 (2019). https://doi.org/10.1007/s00590-018-2338-0

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Keywords

  • Lumbar microdiscectomy
  • MRI changes
  • Degeneration
  • Perineural fibrosis