Title Page
ABSTRACT
국문 초록
PREFACE
Contents
CHAPTER 1. INTRODUCTION 16
1.1. Background 16
1.2. Objective 18
1.3. Hypothesis 19
1.3.1. High correlation values would be obtained for all motions including hip flexion, hip extension, hip abduction, and hip adduction. 19
1.3.2. High correlation values would be obtained for some motions among the four hip motions. 19
1.3.3. Low correlation values would be obtained for all hip motions. 19
1.4. Terminology for position 20
CHAPTER 2. MATERIAL & METHODS 21
2.1. Participants 21
2.2. Procedures 22
2.3. Hip motions 25
2.3.1. Hip abduction 25
2.3.2. Hip adduction 26
2.3.3. Hip extension 27
2.3.4. Hip flexion 28
2.4. Equipment 29
2.4.1. VICON® 29
2.4.2. 4D EYE® 33
2.5. Data collection 36
2.6. Statistical analysis 37
CHAPTER 3. RESULTS 39
CHAPTER 4. DISCUSSION 53
CHAPTER 5. CONCLUSION 57
REFERENCES 58
Table 1. Characteristics of participants 21
Table 2. Information regarding VICON® markers' placement 30
Table 3. Information regarding 4D EYE® markers' placement 34
Table 4. Comparison between variances in angle (MAX-MIN) 40
Table 5. ICC results obtained with the VICON® and 4D EYE® systems 44
Figure 1. A-position image of a subject and the attached points of the VICON® markers. 20
Figure 2. Flowchart of the procedures. 23
Figure 3. Location of the 4D EYE® and VICON® cameras. 24
Figure 4. End position of hip abduction. 25
Figure 5. End position of hip adduction. 26
Figure 6. End position of hip extension. 27
Figure 7. End position of hip flexion. 28
Figure 8. Morphology and installation of a VICON® camera. 29
Figure 9. Skeleton model generated by VICON® including the 35 markers. 32
Figure 10. Morphology and installation of the 4D EYE® camera. 33
Figure 11. Skeleton model used by the 4D EYE® system including the 27 landmark points. 35
Figure 12. Python code used for down-sampling. 38
Figure 13. Representative time series plots of VICON® and 4D EYE® for hip movements. 42
Figure 14. ICC results of the VICON® and 4D EYE® systems graded by the Fleiss standard. 51