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• Clinical Article •
Nerve root sedimentation sign MRI quantitative analysis and its significance
CAO He-tao  CHENG Yue  ZANG Xiao-jin  XIA Zhen-duo 

DOI:10.12015/issn.1674-8034.2018.02.004.


[Abstract] Objective: To analyze the relations between nerve root sedimentation sign (NRSS) with the shape and size of dural sac and its significance.Materials and Methods: 3.0 T MRI data of 85 patients with lumbar degenerative were analyzed retrospectively, based on T2WI axis, NRSS negative (-) defined as horsetail nerve dorsal to the line connected between joints, and positive (+) as it ventral to the line connected between joints. The form of dural sac was divided roughly into two types of atrophy and full. The dural sac cross-section area (DSCA) and its ventral part (vDSCA) and dorsal part (dDCSA) to the line connected between joints were measured, and both ratio d/v value was calculated. DCSA was divided into three levels: no LSS (≥ 100 mm2), relative LSS (76—100 mm) and absolute LSS (≤75 mm2). Observed by two high qualification doctor independently, result was checked by Kappa consistency; the comparison of differences of DSCA, d/v value and d/v value of the corresponding level in different level DSCA between NRSS- and + was tseted by t test; the comparisons of d/v value between different DSCA levels using analysis of variance (ANOVA); the relationship between NRSS with dural sac form was tseted by χ2 test.Results: In 85 cases, the DCSA of lumbar 2—5 three planes was (138.5±38.9) mm2, (124.8±33.5) mm2,(117.5±29.6) mm2 in NRSS- respectively and (118.5±31.7) mm2 (P=0.032), (95.5±27.9) mm2 (P=0.029) and (80.2±25.4) mm2 (P=0.027) in NRSS+ respectively; the occupation ratio of atrophy and full dural sac was 0.16 in NRSS- and 6.3 in NRSS+(P=0.012); the d/v value was 0.64±0.29 in NRSS- and 0.38±0.22 in NRSS+(P=0.035); of DSCA≤75 mm2, 76—100 mm2 and ≥100 mm2, the d/v value was 0.61±0.23, 0.42±0.18 and 0.32±0.11 respectively, two more significant difference (F=18.46, P=18.46) and the significant difference was found in the corresponding level from lumbar 2—5 three section (P<0.05).Conclusions: NRSS was related to the morphology of dural sac and the size of DCSA and d/v value, understanding these relationships will help interpretation of formation mechanism of NRSS+.
[Keywords] Nerve root sedimentation；Dural sac；Lumbar vertebrae；Magnetic resonance imaging

CAO He-tao Department of Radiology, the Affiliated Hospital of Nantong Medical College, Nantong 226001, China

CHENG Yue Department of Radiology, the Affiliated Hospital of Nantong Medical College, Nantong 226001, China

ZANG Xiao-jin Department of Radiology, Binhai People's Hospital of Jiangsu, Binhai 224500, China

XIA Zhen-duo* Department of Radiology, the Affiliated Hospital of Nantong Medical College, Nantong 226001, China

*Correspondence to: Xia ZD, E-mail: ntfyxzd@163.com

Conflicts of interest   None.

Received  2017-08-23
Accepted  2017-12-08
DOI: 10.12015/issn.1674-8034.2018.02.004
DOI:10.12015/issn.1674-8034.2018.02.004.

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