Title Page
Contents
I. Introduction 9
II. Materials and Methods 11
1. Study design and patient characteristics 11
2. Preoperative data, clinical outcomes and definition of unsuccessful outcomes 12
3. Radiologic measurement 12
4. Statistical analysis 13
III. Result 15
1. Demographic and preoperative data 15
2. Clinical outcomes 15
3. Subgroup analysis 16
4. Radiologic risk factor analysis 16
5. Cutoff value of ipsilateral CRA for unsuccessful outcome 17
IV. Discussion 18
V. Conclusion 23
VI. Reference 24
ABSTRACT KOREAN 41
ABSTRACT ENGLISH 43
Table 1. Demographic data of overall patients 29
Table 2. Demographic data of two groups 30
Table 3. Preoperative radiologic data between two groups 31
Table 4. Univariate logistic regression analysis predicting unsuccessful outcomes 32
Table 5. Multivariate logistic regression analysis predicting unsuccessful outcomes 33
Figure 1. Schematic illustrations of lumbar foraminal stenosis grading 34
Figure 2. Radiologic foraminal stenosis zone using T2-weighted magnetic resonance image according to Lee's classification 35
Figure 3. Measurement of the radiologic parameters 36
Figure 4. Measurement of the coronal root angle (CRA) 37
Figure 5. Clinical outcomes 38
Figure 6. Case illustration of unsuccessful outcome 39