• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2018년도 제58차 하계학술대회논문집 26권2호
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• pp.171-172
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• 2018

목뼈는 척주 중에서 두개골과 등뼈(흉추) 사이의 부분으로 목 부분을 형성하는 뼈 구조물이다. 위치는 머리뼈(두개골) 밑에서부터 갈비뼈가 붙는 등뼈(흉추)의 윗부분까지를 이른다. 본 논문에서는 목을 구부려 턱이 가슴에 닿도록 하는 굽힘과, 목을 들어 천장을 보는 것처럼 자세를 취하는 폄에 대하여 각을 측정한다. 굽힘의 각도는 $45{\sim}50^{\circ}$가 기본이며 최대의 가동 범위는 $80{\sim}90^{\circ}$이다. 폄의 각도 또한 $40^{\circ}{\sim}50^{\circ}$가 기본이며 정상은 $70^{\circ}$로 제한된다. 굽힘과 폄의 각도가 기본에 못 미치거나 통증을 유발할 때에는 능동과 수동 돌림의 치료법으로 치료하도록 한다.

• 제어로봇시스템학회논문지
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• 제18권2호
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• pp.69-75
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• 2012

This paper proposes a biomimetic finger module to be used in a lightweight hand prosthesis. The finger module consists of finger skeleton and an actuator module driven by SMA (Shape Memory Alloy). The prototype finger module can perform flexion and extension motions; finger flexion is driven by a contraction force of SMA, but it is extended by an elastic force of an extension spring inserted into the finger skeleton. The finger motions are controlled by feedback of electric resistance of SMA because the finger module has no sensors to measure length and angle. Total weight of a prototype finger module is 30g. In experiments the finger motions and finger grip force are tested and compared with simulation results when a constant contraction force of SMA is given. The experimental results show that the proposed SMA-driven finger module is feasible to the lightweight hand prosthesis.

• 대한관절경학회지
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• 제9권1호
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• pp.60-64
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• 2005

목적: 굴곡 구축과 신전제한이 발생한 중노동 작업자에서 발견된 주관절 주두 골극과 상완골 주두와 골곡 사이의 충돌을 발견하고 이 병변이 주관절 신전장애에 미치는 영향과 제거 효과를 파악하고자 하였다. 대상 및 방법: 무거운 물건을 들어올리는 중노동자에서 발생한 통증을 수반하는 신전제한을 갖은 주관절에 대하여 관절경을 시술하였다. 6명 7예를 대상으로 하였으며 환자의 평균 연령은 43 세였다. 내원 당시 동통을 동반한 관절운동 제한을 호소하였으며 평균 관절운동 범위는 굴곡구축 $17^{\circ}$, 후속 굴곡 $87^{\circ}$였다. 결과: 전 예에서 술 후 2개월 추시상 평균 굴곡구축 $2^{\circ}$($15^{\circ}$ 호전), 후속굴곡 $122^{\circ}$($35^{\circ}$ 호전)를 보였으며 술 후 1년 추시상 평균 굴곡구축 $3^{\circ}$($14^{\circ}$ 호전), 후속굴곡 $113^{\circ}$($26^{\circ}$ 호전)의 호전을 얻을 수 있었다. 얻어진 관절 운동 범위 내에서는 동통이 없는 상태를 보였으며, 합병증은 발견되지 않았다. 결론: 만성 반복성 외상에 의해 발생된 주관절 후방부의 퇴행성 강직에 대하여 충돌부위만을 선택적으로 제거하는 방식은 관절운동회복과 동통의 경감에 있어서 효과적이고 조기 재활이 가능한 술식으로 사료된다.

• 한국전문물리치료학회지
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• 제24권4호
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• pp.1-10
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• 2017

Background: Flexion-relaxation phenomenon (FRP) was a term which refers to a sudden onset of myoelectric silence in the erector spinae muscles of the back during standing full forward flexion. Hamstring muscle length may be related to specific pelvic and trunk movements. Many studies have been done on the FRP of the erector spinae muscles. However, no studies have yet investigated the influence of hamstring muscle flexibility on the FRP of the hamstring muscle and lumbopelvic kinematics during forward bending. Objects: The purpose of this study was to examine the flexion-relaxation ratio (FRR) of the hamstring muscles and lumbopelvic kinematics and compare them during forward bending in subjects with different hamstring muscle flexibility. Methods: The subjects of two different groups were recruited using the active knee extension test. Group 1-consisted of 13 subjects who had a popliteal angle under $30^{\circ}$; Group 2-consisted of 13 subjects who had a popliteal angel above $50^{\circ}$. The kinematic parameters during the trunk bending task were recorded using a motion analysis system and the FRRs of the hamstring muscles were calculated. Differences between the groups were identified with an independent t-test. Results: The subjects with greater hamstring length had significantly less lumbar spine flexion movement and more pelvic flexion movement. The subjects with greater pelvic flexion movement had a higher rate of flexion relaxation during full trunk bending (p<.05). Conclusion: The results of this study suggest that differences in hamstring muscle flexibility might cause changes in people's hamstring muscle activity and lumbopelvic kinematics.

• The Journal of Korean Physical Therapy
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• 제26권6호
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• pp.449-452
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• 2014

Purpose: The purpose of this study was to analyze the coordination between trunk flexion and lower limb extension contributing to vertical propulsion during sit-to-stand (STS) at different chair heights in the elderly. Methods: Ten elderly subjects were asked to stand up at their natural speed from different chair heights : (1) $90^{\circ}$ knee flexion; (2) $100^{\circ}$ knee flexion; (3) $110^{\circ}$ knee flexion; and (4) $120^{\circ}$ knee flexion. A standard chair without a backrest or armrests was used in this study. To remove inertial effects of upper limb movements, subjects were asked to stand up from a chair with their arms crossed at the chest. Mean of results of three trials were used in the analysis at different knee flexion angles. Distances moved by the shoulder for compensatory trunk movement was recorded by motion analysis and vertical force was recorded under foot using force plates. Distances moved by the shoulder and vertical ground reaction force measurements were analyzed using repeated ANOVA. Results: Distances moved by the shoulder significantly decreased with higher chair (p<0.05). Vertical forces were not significant difference on chair heights (p>0.05), but results of pairwise comparisons for vertical force revealed significant difference between $90^{\circ}$ knee flexion and $120^{\circ}$ knee flexion (p<0.05). Conclusion: Trunk movement is probably used as a compensatory mechanism at low chair heights to increase lift-off from sitting by the elderly.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2009년도 춘계학술대회 논문집
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• pp.45-46
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• 2009

• 대한관절경학회:학술대회논문집
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• 대한관절경학회 제21차 추계 학술대회
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• pp.117-118
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• 2009

• 한국운동역학회지
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• 제17권3호
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• pp.155-164
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• 2007

This study is aimed at determining the effects of rehabilitation training on lumbar extension strength and relief of back pain in middle-aged women of low back pain. Twenty-nine subjects(total 29 people; CLBP 16, HLD 13) were trained twice per week for eight weeks and completed a maximum isometric test at various flexion angle(the degree of $0^{\circ}$, $12^{\circ}$, $24^{\circ}$, $36^{\icrc}$, $48^{\circ}$, $60^{\circ}$, $72^{\circ}$) by lumbar extension machine. The result showed that. 1. Patient group of CLBP were increased the maximum lumbar extension strength at a range of 7 flexion angles after rehabilitation rather than no rehabilitation(on the average 60.75%). The operated patient group in HLD also showed an increase of 56.55%. In view of these cases, all of two groups showed a significant increase of muscle strength(p<.05). But there is no difference between pre-exercise and post-exercise groups. 2. Patient group of CLBP were increased higher rate than 41% for maximum lumbar extension strength(91.79% at $0^{\circ}$, 79.41% at $12^{\circ}$, 65.89% at $24^{\circ}$) at all angles after 8 weeks training. Both groups indicated a significant increase(p<.05) of lumbar extension strength at all degrees. There is no difference between pre-exercise and post-exercise groups. 3. Relief of back pain in Patient group of CLBP showed a decrease of average 105.2% and patient group of HLD indicated a decrease of average 64.57% two groups showed a significant reduction (p<.05, p<.05). But in case of a decrease of pain, CLBP group got 3.44 points and HLD group got 4.77 points. In view of these results, two groups showed remarkable reduction of back pain, however HLD group had residual pain relatively.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.907-910
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• 2005

Although several artificial disc designs have been developed for the treatment of discogenic low back pain, biomechanical change with its implantation was rarely studied. To evaluate the effect of artificial disc implantation on the biomechanics of functional spinal unit, nonlinear three-dimensional finite element model of L4-L5 was developed with 1-mm CT scan data. Two models implanted with artificial discs, SB $Charit\acute{e}$ or Prodisc, via anterior approach were also developed. The implanted model predictions were compared with that of intact model. Angular motion of vertebral body, force on spinal ligaments and facet joint, and the stress distribution of vertebral endplate for flexion-extension, lateral bending, and axial rotation with a compressive preload of 400 N were compared. The implanted model showed increased flexion-extension range of motion and increased force in the vertically oriented ligaments, such as ligamentum flavum, supraspinous ligament and interspinous ligament. The increase of facet contact force on extension were greater in implanted models. The incresed stress distribution on vertebral endplate for implanted cases indicated that additinal bone growth around vertebral body and this is matched well with clinical observation. With axial rotation moment, relatively less axial rotation were observed in SB $Charit\acute{e}$ model than in ProDisc model.

• 한국전문물리치료학회지
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• 제16권2호
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• pp.9-15
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• 2009

The purposes of this study were to compare abductor hallucis (AbdH) muscle activity during toe curl exercise according to position of interphalangeal joint (IPJ). Fifteen healthy subjects with neutral foot were recruit for this study. All subjects performed toe curl exercise with towel while maintaining the IPJ in flexion (condition 1) and extension (condition 2). Toe curl exercise with towel was perform three trials for five second periods in each condition. Surface electromyography (EMG) activities were recorded from three muscles (AbdH, tibialis anterior, peroneous longus) in each condition. EMG activity was normalized to the value of maximal voluntary isometric contraction (%MVIC). The EMG activities acoording to position of IPJ were compared using a paired t-test. This study showed that the EMG activity of AbdH during toe curl exercise with IPJ extension significantly increased compared to those during toe curl exercise with IPJ flexion (p<.05). However, the EMG activity of tibialis anterior and peroneus longus were not significantly different between the conditions (p>.05). These results suggest that toe curl exercise with towel must be performed with extension of IPJ in order to strengthen intrinsic muscle in subjects with overuse injuries related to excessive pronation.