Korean Journal of Radiology

The Korean Society of Radiology (대한영상의학회)
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Transiting Nerve Rootlet Abnormalities on MRI after Lumbar Laminectomy: Associations with Persistent Postoperative Pain

  • Chankue Park (Department of Radiology, Research Institute for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital) ;
  • In Sook Lee (Department of Radiology, Pusan National University Hospital, Pusan National University School of Medicine) ;
  • Kyoung Hyup Nam (Department of Neurosurgery, Pusan National University Hospital, Pusan National University School of Medicine) ;
  • You Seon Song (Department of Radiology, Pusan National University Hospital, Pusan National University School of Medicine) ;
  • Tae Hong Lee (Department of Radiology, Pusan National University Hospital, Pusan National University School of Medicine) ;
  • In Ho Han (Department of Neurosurgery, Pusan National University Hospital, Pusan National University School of Medicine) ;
  • Dong Hwan Kim (Department of Neurosurgery, Pusan National University Hospital, Pusan National University School of Medicine)
  • Received : 2020.03.03
  • Accepted : 2020.05.26
  • Published : 2021.02.01
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Abstract

Objective: To determine whether changes in the transiting nerve rootlet or its surroundings, as seen on MRI performed after lumbar hemilaminectomy, are associated with persistent postoperative pain (PPP), commonly known as the failed back surgery syndrome. Materials and Methods: Seventy-three patients (mean age, 61 years; 43 males and 30 females) who underwent single-level partial hemilaminectomy of the lumbar spine without postoperative complications or other level spinal abnormalities between January 2010 and December 2018 were enrolled. Two musculoskeletal radiologists evaluated transiting nerve rootlet abnormalities (thickening, signal alteration, distinction, and displacement), epidural fibrosis, and intrathecal arachnoiditis on MRI obtained one year after the operations. A spine surgeon blinded to the radiologic findings evaluated each patient for PPP. Univariable and multivariable analyses were used to evaluate the association between the MRI findings and PPP. Results: The presence of transiting nerve rootlet thickening, signal alteration, and ill-distinction was significantly different between the patients with PPP and those without, for both readers (p ≤ 0.020). Conversely, the presence of transiting nerve rootlet displacement, epidural fibrosis, and intrathecal arachnoiditis was not significantly different between the two groups (p ≥ 0.128). Among the above radiologic findings, transiting nerve rootlet thickening and signal alteration were the most significant findings in the multivariable analyses (p ≤ 0.009). Conclusion: On MRI, PPP was associated with transiting nerve rootlet abnormalities, including thickening, signal alterations, and ill-distinction, but was not associated with epidural fibrosis or intrathecal arachnoiditis. The most relevant findings were the nerve rootlet thickening and signal alteration.

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