Erratum to: A new grading system of lumbar central canal stenosis on MRI: an easy and reliable method

Lee, Guen Young; Lee, Joon Woo; Choi, Hee Seok; Oh, Kyoung-Jin; Kang, Heung Sik

doi:10.1007/s00256-011-1153-z

Cited by 131 publications

(112 citation statements)

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“…A total of 160 patients were qualitatively analysed from L3-4 to L5-S1. Radiologists assessed the presence and grade of CLSS at the stenosis point according to the new grading system suggested by Lee et al [5]. We named this grading system the Lee system.…”

Section: Methodsmentioning

confidence: 99%

“…Many prior reports have evaluated the relationships between radiological parameters and clinical manifestations or outcomes, but radiological findings alone cannot predict clinical severity and outcomes [5].…”

Section: Discussionmentioning

confidence: 99%

“…Lohman et al [3] found no relationship between canal cross-sectional area measured on CT and clinical symptoms. In 2011, Lee et al [5] reported a new MRI grading system for CLSS. They classified CLSS into four grades according to cauda equina shape based on T 2 weighted axial images.…”

Section: Discussionmentioning

confidence: 99%

“…Ogikubo et al [2] reported that encroachment of the cauda equina with its nerve roots is the primary cause of symptoms, and signs and direct obstruction of blood flow to the cauda equina through encroachment can result in clinical manifestations. Lee et al [5] suggested that this new grading system provides a reliable assessment of CLSS, with interobserver agreement for four grades ranging from 0.730 to 0.953 (intraclass correlation coefficient reliability). In the current study, interobserver agreement for the new grading system was similar (k50.780).…”

Section: Discussionmentioning

confidence: 99%

“…However, this grading system can be time-consuming and has not come into widespread clinical practice. In 2011 Lee et al [5] reported a new MRI grading system for CLSS. They classified CLSS into four grades according to cauda equina shape based on T 2 weighted axial images and suggested that this new grading system provides a reliable assessment of CLSS.…”

Section: Advances In Knowledgementioning

confidence: 99%

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Clinical correlation of a new practical MRI method for assessing central lumbar spinal stenosis

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et al. 2013

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Objective: To evaluate interobserver agreement and determine whether a new MRI grading system agrees with symptoms and neurological signs. Methods:We examined 160 patients (72 males and 88 females; mean age 57 years) who underwent MRI of the lumbar spine at our institution and were evaluated by two musculoskeletal radiologists. The presence and grade of central lumbar spinal stenosis (CLSS) at L3-4, L4-5 and L5-S1 were assessed according to a new grading system, the Lee system. The results were correlated with clinical manifestations and neurological examinations [positive neurological manifestation (PNM) and negative neurological manifestation (NNM)]. Statistical analyses were performed using kappa statistics and non-parametric correlation analysis (Spearman's correlation).Results: Interobserver agreement in the grading of CLSS between the two readers was substantial (k50.780). Interobserver agreement of the L4-5 level and older age group was high (0.789, 0.814). The correlation coefficient (R) of Reader 1 between MRI Grades 0, 1, 2 or 3 and neurological manifestations (negative or positive) was 0.654; the R of Reader 2 was 0.591. In the younger age group (,57 years), the R of Reader 1 was 0.634 and the R of Reader 2 was 0.500. In the older age group ($57 years), the R of Reader 1 was 0.650 and the R of Reader 2 was 0.645. Correlation coefficients were higher at the L3-4 level (0.612-0.678) than at other levels but did not show statistical significance (p.0.05). Conclusion:Interobserver agreement for the new CLSS grading system was substantial. Grade 0 was associated with NNMs and Grade 3 with PNMs in this cohort. Grade 2 demonstrates more cases of PNM than NNM but requires further evaluation. Correlations between MRI grades and clinical manifestations were moderate and slightly higher in older patients.

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Section: Methodsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%