Title Page
Abstract
Contents
Chapter 1. Introduction 9
Chapter 2. Methods 10
2.1. Study design and population 10
2.2. Diagnostic imaging 12
2.3. Statistical analysis 14
Chapter 3. Results 15
Chapter 4. Discussion 24
Chapter 5. Conclusions 27
Chapter 6. Reference 28
Bibliography[내용없음] 6
국문초록 31
Table 1. The qualitative grading systems of lumbar spinal stenosis on MRI. 13
Table 2. Percentage of surgical patients according to combination of grades of maximal central and foraminal stenosis. 19
Table 3. Univariate and multivariate logistic regression analyses of risk factors of surgical treatment. 20
Figure 1. Flowchart of subject recruitment. LSS, lumbar spinal stenosis; MRI, magnetic resonance imaging 11
Figure 2. The number of surgical and conservative patients according to the grade of maximal central stenosis on MRI. 17
Figure 3. The number of surgical and conservative patients according to the grade of maximal foraminal stenosis on MRI. 18
Figure 4. Kaplan-Meier survival curve of overall LSS patients 21
Figure 5. Kaplan-Meier survival curves according to the grade of maximal central stenosis with concomitant foraminal stenosis (A) and without... 22
Figure 6. Kaplan-Meier survival curves according to the grade of maximal foraminal stenosis with concomitant central stenosis (A) and without... 23