• Journal of the Ergonomics Society of Korea
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• v.34 no.2
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• pp.151-165
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• 2015

Objective: This study aims to develop and scientifically investigate the efficacy of the Spine S-curve Reactive Backrest that responds to the spine curvature of the user when seated, and maintains and enhances the natural S-curve of the lower back, thereby helping to relieve fatigue, correct posture and prevent spine deformities. Background: The focus of current development, design guidelines and/or standards for office chairs is mainly placed on the chair's dimensions, incline angle, adjusting features and lumbar support. Research and development was called for developing a chair backrest that maintains and improves the S-curve of the full spine. Method: The Spine S-curve Reactive Backrest was ergonomically designed to maintain correct posture and enhance user comfort. When leaned on, the backrest responds to the user's spine line and the whole lower back sits closely against the backrest, thereby aligning the user's lower back and backrest as one to maintain and improve the natural S-curve formation of the spine. In order to evaluate the efficacy of the newly designed chair (new design) and the comparison target (chair), five male college students of standard body type with normal spine curvature were selected as test subjects, and a motion analyzer and electromyography were utilized to measure S-curve and erector spinae muscle activity when seated. Results: The spine S-curve was better maintained and improved when sitting in the new design than in the comparison chair. Particularly notable was the greater displacement gap of the thoracic spine than the cervical spine, and also that of the lumbar more than the thoracic spine, with the increase of the backrest tilting angle. Furthermore, the electromyogram results showed the new design caused a lower fatigue level of the erector spinae muscles compared to the comparison chair, and also earned a higher preference in the subjective opinion results. Conclusion: The newly designed chair in this study responds to the user's spine curvature and maintains and enhances the lower back's natural S-curve, and thereby relieves fatigue, promotes better posture, and helps to prevent spine deformities better than existing office chairs. There is a need to widely introduce and supply this new design. Application: The new design is applicable to office and student chairs, and is expected to improve concentration and work efficiency.

• The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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• v.10 no.1
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• pp.117-128
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• 2004

I have processed all the data by using SPSS PC+. And my research process was investigated for 34 students on the Forward Bending Test, Foot Printer Test, Feedoscope Test, X-ray Test and so on. The object of this thesis is to study the correlation between spine deformity and foot abnormality in a theoretical and empirical method. The main results of this study were as follows: 1. There was statistical significance on the correlation between foot length and spine length. 2. Spinal curve is the smallest on the pes plannus group and the biggest on the pes cavus group without statistical significance. 3. Left lumbar curve is the smallest, and right thoracic spine curve is the biggest on the left foot pattern group with statistical significance. 4. On the foot weight bearing groups, there was statistical significance both of between left and right foot groups. 5. There was no statistical significance on the t-test analysis between left and right foot area according to spinal curve typology. But there was tendency that thoracic spine curve is bigger in the same side of the foot area and lumbar spine curve is bigger in the opposite side of foot area.

• The Journal of Churna Manual Medicine for Spine and Nerves
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• v.5 no.2
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• pp.33-41
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• 2010

Objectives : This study is designed to find out the relationship of scoliotic curve, cervical lordosis, lumbar lordosis and Ferguson's angle. Method : The study was composed of 46 scoliosis patients who had single curvature(Group I) on their lumbar spine(Group I-A) or thoracic spine(Group I-B) and 38 patients who had double curvature(Group II) on their lumbar and thoracic spine. The patients were evaluated with X-ray findings of full spine AP and Lateral views and statistically analyzed. Results : 1. Group II showed a significant increase in scoliotic curve angle as compared with Group I(P<0.05). 2. Scoliotic curve has a negative relationship with cervical lordosis in group II. Conclusion : 1. The patients who has double curvature of spine had higher scoliotic curve angle compared with who has single curvature. 2. The Scoliotic curve and cervical lordosis was statistically concerned on patients who has double curvature of spine.

• The Journal of Churna Manual Medicine for Spine and Nerves
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• v.1 no.2
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• pp.11-20
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• 2006

Objectives: The aim of this study is to investigate clinical effects of Chuna treatment on the neck pain patient with hypolordotic cervical spine. Methods: From June 2006 to August 2006, 20 cases of neck pain patient with hypolordotic cervical spine were divided into 2 groups. Control group(n=10) was treated only acupuncture therapy, and sample group(n=10) was treated Chuna after acupuncture therapy same as control group. Degrees of pain were measured with Visual Analogue Scale(VAS), and the change of cervical curvature was assessed Depth of cervical curve, Method of Jochumsen, and Angle of cervical curve. Results: 1. After 3th and 5th treatment, there was statistical significance between control and sample group in VAS. 2. After 5th treatment, there was not statistical significance between control and sample group in Depth of cervical curve, Method of Jochumsen, and Angle of cervical curve. Conclusions: On treating the neck pain patient with hypolordotic cervical spine, Chuna treatment is more effective than only acupuncture therapy in reducing neck pain, but Chuna treatment for short-term is not more effective than only acupuncture therapy in restoring cervical curvature.

• The Journal of Churna Manual Medicine for Spine and Nerves
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• v.1 no.2
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• pp.93-100
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• 2006

Objectives: To invesgate correlation between the scoliotic curve and BMI, cervical lordosis, lumbar lordosis and Ferguson angle in spinal scoliotic patient. Methods: The study was composed of 14 scoliosis patients beyond cobb'a angle $10^{\circ}$ (sample I group) and 15 scoliosis patients over cobb'a angle $10^{\circ}$ (sample II group). The patients were evaluated with X-ray findings of full spine AP and lateral views and statistically analyzed. Results: 1. Sample II group showed a significant decrease in BMI as compared with Sample I group(P<0.05). 2. Scoliotic curve had s negative relationship with $BMI({\gamma}=0.406)$ 3. Scolotic patients had a lower cervical angle than normal man. Conclusion: 1. The larger the scoliotic angle, the lower BMI 2. There are no concemed scoliotic curve and cervical lordosis, lumbar lordosis and Ferguson angle.

• Journal of the Korean Society of Physical Medicine
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• v.15 no.3
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• pp.69-77
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• 2020

PURPOSE: The aim of this study was to measure changes in spine inclination and thoracolumbar structure and morphology according to upper-extremity movements with and without resistance in order to evaluate the spine stability in workers. METHODS: Forty-eight middle-aged male workers (mean age, 40.48 ± 6.27 years) participated in this study. Using the spine analysis system, changes in the inclination of the spine and structure as well as shape of the thoracolumbar spine were measured. For posture measurement, the postures of standing, lifting the right and left arms (shoulder joint 90° flexion), and lifting with both arms were measured in random order. In addition, variables were measured using a resistance of 3 kg for each posture. The statistical significance level was set at α = .05 for all variables. RESULTS: There were statistically significant differences between the front and back inclinations of the spine, kyphotic curve of the thoracic spine, lordotic curve of the lumbar spine, rotation changes in the thoracolumbar spine, and rotation changes in the T4 vertebra (p < .05). However, there was no significant difference in the left and right tilts of the spine. In the post-hoc analysis, rotation changes in the T4 vertebra showed a significant difference in posture when resistance was applied to the left and right sides CONCLUSION: Causes of musculoskeletal diseases include excessive thoracic spine rotation, torsion, and hyperlordosis of the lumbar spine. Therefore, it is necessary to improve the working environment in order to ensure a healthy posture and prevent musculoskeletal diseases that can reduce the ability to carry various and/or excessive loads.

• Journal of KIISE:Computer Systems and Theory
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• v.32 no.8
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• pp.411-417
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• 2005

We present a method to reconstruct a canal surface from a point cloud (a set of unorganized points). A canal surface is defined as a swept surface of a moving sphere with varying radii. By using the shrinking and moving least-squares methods, we reduce a point cloud to a thin curve-like point set which can be approximated to the spine curve of a canal surface. The distance between a point in the thin point cloud and a corresponding point in the original point set represents the radius of the canal surface.

• Journal of International Academy of Physical Therapy Research
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• v.9 no.2
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• pp.1513-1516
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• 2018

The purpose of this study was to identify the effect of upper thoracic mobilization on cervical alignment in stroke patients with forward head posture. The subject's of this study were two stroke patients with forward head posture and a cervical curve angle (four-line Cobb's method; FLCM) less than $40^{\circ}$. The intervention, central posterior-anterior (PA) mobilization, was applied to the T1-T4 vertebrae (upper thoracic spine) following the Maitland concept. This mobilization was applied three times per week for four weeks. In the results, the cervical curve angle (FLCM) increased for both subject 1 and 2. However, Jochumsen method score was decreased in subject 1, while it was increased in subject 2. These results demonstrate that upper thoracic mobilization had the positive effect on the cervical curve angle but not on Jochumsen method score. These findings suggest that PA mobilization on the upper thoracic spine could correct cervical curve angle measured by FLMC in stroke patients with FHP.

• Journal of Korean Medicine Rehabilitation
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• v.25 no.4
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• pp.83-92
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• 2015

Objectives To measure and analyze the curvature of the cervical spine for university students. Methods This study carried out on 132 students. The cervical spine curvature was measured by six measuring methods. The type and numeric value of cervical spine curvature was analyzed by Angle of cervical curve (C1~C7), Angle of cervical curve (C2~C7), Jackson's angle, Ishihara Index, Depth of cervical curve and Method of Jochumsen. Cervical spine curvatures between male and female are compared by Mann-Whitney test. Rate of type of cervical curvature between male and female are compared by linear by linear association. Results 1. The average of angle of cervical curve (C1~C7) is $33.78{\pm}9.85^{\circ}$, angle of cervical curve (C2~C7) is $10.28{\pm}8.12^{\circ}$. The average of Jackson's angle is $14.02{\pm}10.01^{\circ}$, average of Ishihara Index is $8.46{\pm}10.58%$. The average of Depth of cervical curve is $5.15{\pm}4.72mm$ and average of Method of Jochumsen is $0.94{\pm}3.83mm$. 2. More than half of student's cervical curvature showed hypolordosis except Ishihara index. 3. There was significant difference in numeric value of cervical curvature between male and female both groups in terms of Ishihara index. 4. There were insignificant differences between male and female in terms of type of cervical curvature. Conclusions According to above results, we found out average of student's cervical curve. And the results suggest that most of the student's cervical curvature decrease.

• The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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• v.9 no.1
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• pp.29-38
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• 2003

The purpose of this study was to investigate relationship of lumbar extensor muscle power & spinal column curve for old female patients with LDK(Lumbar degenerative kyphosis). Subjects were composed of 37 old female with LDK. The subjects were tested in their spinal segment movement and spinal column curve with Spinal-$Mouse^{\leq}$ in $1^{st}$ loaded test and $2^{nd}$ loaded test and then tested lumbar extensor muscle power with $Medx^{\leq}$ lumbar extension machine. The results of this study, were as follow; There were statistically significant difference $1^{st}$ loaded test and $2^{nd}$ loaded test in upright position increase spinal column forwardly(p<0.01) and decrease lumbar lordosis angle(p<0.01), but no statistically significant difference $1^{st}$ loaded test and $2^{nd}$ loaded test thoracic and hip & sacrum curve angle. Their lumbar extensor muscle poser is very weakness, 61.4% of normal people.