• 한국운동역학회지
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• 제17권1호
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• pp.9-16
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• 2007

Cutting movements frequently occur in sports and influence much Lower Extremity injuries. The purpose of this study was to compare joint motion of lower extremities to cutting angles and running velocities. Seven male subjects performed cutting movements to three angles($0^{\circ}$, $30^{\circ}$, $60^{\circ}$). Subjects were instructed to run five meters at a speed of 2.5m/s and 4.5m/s before contacting their right foot on the force plate and then change direction to the left. The Peak hip, knee and ankle joint kinematics were influenced according to the running velocities and cutting angles. In conclusion, Fast running velocity and cutting angle will may influence on the lower extremity joint instability on real game situation.

• 대한의용생체공학회:의공학회지
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• 제27권5호
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• pp.260-266
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• 2006

Due to damaged vertebrae nerves, serious disease and aging, patients who have to lie down for long period of time need to exercise to maintain up-right standing position and recover their paralytic leg. This study describes a development of an intellectual tilt table which can provide a patient with rehabilitating condition. This can be possible by measuring and displaying the hee bent angle and pressure for each foot during exercise in real time. It is expected that the patient's exercising effect can increase by monitoring these two values during exercise.

• 대한정형외과스포츠의학회지
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• 제11권2호
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• pp.82-86
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• 2012

목적: 운동 선수 중 증상이 있는 부주상골에 대해 변형 Kidner 술식 후 5년이상 추시 관찰하였다. 대상 및 방법: 1999년 7월부터 2004년 12월까지 동통을 동반한 부주상골로 변형 Kidner 술식을 받은 후 5년이상 추적 관찰이 가능한 운동선수 22명(26족) 및 방사선학적 관찰이 가능한 9명(12족)에 대해 후향적 연구를 시행하였다. 모든 환자에 대한 술전 병력 검사 후 주관적 검사로서 미국 족부 정형외과 학회(American Orthopaedic Foot and Ankle Society, AOFAS) 중족부 평가, 시각 통증 척도(Visual Analogue Scale, VAS) 점수를 평가하였다. 술후 최종 추시에서 독립된 검사자가 AOFAS 중족부 평가, VAS 점수, 만족도를 조사하였다. 방사선학적 평가에 대해 술전과 최종 추시 관찰시의 기립 측면 방사선 사진에서 거골-제1중족골 간 각, 거종각, 종골 피치각을 측정하였다. 결과: 술전 AOFAS 점수는 평균 $40.1{\pm}7.5$점(32~57점), 최종 추시 관찰 평균은 $88.7{\pm}8.0$점(72~100점)으로 통계적으로 유의하게 증가하였다(p<0.01). 술전 VAS 점수는 평균 $7.0{\pm}0.9$점(5~9점), 최종 추시 관찰 평균은 $1.8{\pm}0.8$점(1~4점)으로 통계적으로 유의하게 감소하였다(p<0.01). 최종 추시 결과 11명은 매우 만족, 11명은 만족, 4명은 불만족으로 평균 만족도는 85%였다. Wilcoxon 검정상 거골-제1중족골간 각(p=0.67), 거종각(p=0.93) 종골 피치각(p=0.49)으로 수술 전 및 최종 추시 결과 사이에 유의한 차를 보이지 않았다. 결론: 증상이 있는 부주상골에 대한 변형 Kidner 술식 후 5년이상 중기 추시 결과 높은 만족도를 보였다.

• 한국운동역학회지
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• 제31권1호
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• pp.1-15
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• 2021

Objective: The aim of this study was to investigate 1) the difference in static lower extremity alignment (SLEA) according to a history of lateral ankle sprain (LAS), 2) to identify SLEA factors affecting LAS, and 3) to present the cut-off value and 4) the usefulness and limitations of the SLEA measurement. Method: This case-control study recruited 88 men (age: 27.78±4.69 yrs) and 39 women (age: 24.62±4.20 yrs) subjects with and without LAS. SLEA measurement protocol included Q angle, tibiofemoral angle, genu recurvatum, rear foot (RF) angle, tibal varum and torsion, navicular drop, ankle dorsiflexion range of motion (DF ROM). Independent t-test, logistic regression and receiver operating characteristic (ROC) curve were used for statistical analysis. Results: Men with a history of LAS had significantly smaller Q angles both in standing and in supine position, while women with a history of LAS had significantly greater DF ROM in non-weight bearing (NWB; p < 0.05). Logistic regression model suggests tibial varum (OR = 0.779, p = 0.021) and WB DF ROM (OR = 1.067, p = 0.045) were associated with LAS in men. In case of women, there were no significant SLEA factors for LAS, however, ROC curve analysis revealed standing RF angle (AUC = 0.647, p = 0.028) and NWB DF ROM (AUC = 0.648, p = 0.026) could be affecting factors for LAS. Conclusion: There are differences in SLEA according to the history of LAS, furthermore, the identified items were different by sex. In case of men, tibial varum and WB DF ROM affect LAS occurrence. Standing RF angle and NWB DF ROM of women could be a predictor for LAS. However, since the sensitivity and specificity in most of the SLEA measurements are low, kinematic in dynamic tasks should be considered together for a more accurate evaluation of LAS risk.

• 한국운동역학회지
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• 제21권3호
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• pp.269-279
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• 2011

This study was analyzed the characteristics on the stability of posture while conducting a through two and half rotation technic of pench$\acute{e}$ in rhythmic gymnastics. Two rhythmical gymnastics player(LKH and SSJ) who is a member of the national team were selected, and for obtain the kinematic and kinetic variables were used a ProReflex MCU 240 infrared camera(Qualisys, Sweden) and a Type9286A force platform(Kistler, Switzerland). The mechanical factors were computed by using Visual3D program and Matlab R2009a. During the landing and rotation phase the results showed following characteristics; 1) In medial-lateral and horizontal displacement of the support foot, LKH showed smaller movement than SSJ, but SSJ showed smaller movement than LKH in swing foot. LKH showed bigger movement in medial-lateral axis of COP and vertical axis of COG, but SSJ showed bigger movement in horizontal axis of COP and medial-lateral axis of COG. 2) SSJ showed bigger maximum horizontal and vertical velocity at P1 and P2 than LKH. 3) In the inclination angle of COP and COG, SSJ showed smaller change than LKH, but within medial-lateral tilt of the shoulder, LKH performed rotation motion in horizontal position than SSJ. There was no differences in each force components during rotation, but on landing phase, the results showed a characteristic that SSJ exerted bigger breaking force and vertical force than LKH.

• 대한족부족관절학회지
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• 제8권2호
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• pp.191-194
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• 2004

Purpose: Anatomic configuration of the ankle joint is useful information during various ankle procedures. This study was prospectively designed to investigate the sagittal inclination pattern of the ankle joint. Materials and Methods: Lateral standing ankle radiographs from one-hundred people (age: $17{\sim}68$, M:F=45:55) and magnetic resonance (MR) sagittal ankle images from twenty-four people (age: $16{\sim}65$, M:F=14:10) were studied. Post-traumatic, arthritic, or grossly deformed ankles at any reason were excluded. The posterior inclination angle (PIA) of the distal tibia was measured and compared between the lateral and the medial segment. Results: On plain radiographic data, the average PIA of the distal tibia was $6.14^{\circ}{\pm}3.56^{\circ}$ (range $0^{\circ}$ to $14^{\circ}$) in the lateral segment and $13.16^{\circ}{\pm}3.05^{\circ}$ (range $6^{\circ}$ to $22^{\circ}$) in the medial segment. On MR imaging data, the average PIA of the distal tibia was $5.08^{\circ}{\pm}4.26^{\circ}$ (range $1^{\circ}$ to $10^{\circ})$ in the lateral segment and $10.16^{\circ}{\pm}4.87^{\circ}$(range $5^{\circ}$ to $17^{\circ}$) in the medial segment. The PIA between two segments was significantly different. Conclusion: The sagittal configuration of the medial area ankle joint and the lateral area ankle joint has difference in the degree of posterior inclination and shape of curvature.

• 대한의용생체공학회:의공학회지
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• 제31권5호
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• pp.344-350
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• 2010

The aim of this study was to investigate the characteristics of the flexion withdrawal reflex modulated during Lokomat treadmill walking in people with spinal cord injury. The influence of the limb position and movement were tested in 5 subjects with chronic spinal cord injury. EMG activities from tibialis anterior and moments of the hip joint elicited by the foot stimulation were examined during Lokomat treadmill walking. To trigger the flexion withdrawal reflex during Lokomat treadmill walking, a train of 10 stimulus pulses was applied at the skin of the medial arch. The TA EMG activity was modulated during gait phase and the largest TA reflex was obtained after heel-off and initial swing phase. During swing phase, TA EMG was 40.9% greater for the extended hip position (phase 6), compared with flexed hip position (phase 8). The measured reflex moment of the hip joint was also modulated during gait phase. In order to characterize the neural contribution of flexion reflex at the hip joint, we compared estimated moments consisted of the static and dynamic components with measured moment of the hip joint. The mean static gains of reflex hip moments for swing and stance phase are -0.1, -0.8, respectively. The mean dynamic gains of reflex hip moments are 0.25 for swing, 0.75 for stance phase. From this study, we postulate that the joint moment and muscle response of flexion withdrawal reflex have the phase-dependent modulation and linear relationship with hip angle and angular velocity for swing phase during Lokomat treadmill walking.

• 대한족부족관절학회지
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• 제9권1호
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• pp.87-93
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• 2005

Purpose: We conducted this study to examine the clinical results of the proximal metatarsal wedge osteotomy using a single screw fixation and the distal soft tissue procedure in patients with moderate to severe hallux valgus deformity. Materials and Methods: Between February 2002 and February 2004, we performed these procedures on 12 patients (15 cases). The 6 cases of all patients had mild to moderate instability in the first MTC (metatarsocuneiform) joint. We estimated the clinical outcomes, the radiological findings and complications. Results: AOFAS score was improved from preoperative 41.5 points to 87.7 points lastly on average. The mean correction angle of HVA and IMA was $23.8^{\circ}$ and $6.6^{\circ}$, respectively. The mean position of tibial sesamoid was 2.67 before surgery and 0.87 after surgery. The mean shortening of the first metatarsal bone was 3.07 mm after surgery. There was no pain and complications on the first MTC joint except the breakage of screw in one case and instability of the first MTC joint was improved postoperatively. Conclusion: We obtained good clinical and radiographic outcomes in our series. So, proximal metatarsal wedge osteotomy using a single screw fixation and distal soft tissue procedure seems one of the good surgical treatments for moderate hallux valgus deformity.

• 한국융합학회논문지
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• 제9권5호
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• pp.239-246
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• 2018

본 연구에서는 양궁 슈팅 시 양발의 균형성과 상지 분절 및 관절의 운동학적 분석을 실시하여 점수에 따른 차이를 비교분석 하였다. K대학교 엘리트 양궁선수 9명을 피험자로 선정하였으며, 70 m 거리에서 122 cm 표적지에 각각 3발씩 5엔드를 반복 측정하였다. 7대의 적외선 카메라(Qualisys, sweden)와 2대의 지면반력기(Kistler, Switerland)를 사용하여 상지 분절 및 관절의 움직임과 힘의 작용점(center of pressure [COP])를 산출하였다. 연구결과 양궁 선수가 8점을 쐈을 때, 9-10점을 쐈을 때보다 드로잉 암(drawing-arm)의 팔굽관절 운동범위와 왼발의 좌우 COP 범위가 크게 나타났다(p<.05). 양궁 경기에서 고득점을 유지하기 위해서는 지속적인 균형성이 요구되며, 특히 슈팅하는 순간 활을 지지하는 왼발의 균형성이 중요한 요인으로 작용한다. 또한 활을 지지하는 드로잉 암의 팔굽관절 움직임을 최소화하는 것이 안정적인 슈팅에 도움이 될 것이다.

• 한국전문물리치료학회지
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• 제3권2호
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• pp.55-76
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• 1996

The objective of this study was to identify the immediate effects of the short leg brace on the weight bearing distribution and gait patterns of hemiplegic patients. The subjects of this study were 18 hemiplegic patients who had been hospitalized or visited out-patient department of Rehabilitation Hospital, Yonsei University College of Medicine, from January 5, 1996 through March 23, 1996. PLS(Posterior Leaf Spring) on and off changes in gait patterns were measured using ink foot print as well as by recording weight bearing distribution using a limb load monitor. The data were analyzed by the correlation and paired t-test. The findings were as follows: 1. Eighteen subjects were more weighted on the affected leg when PLS was put off(42.74%) than on(40.08%). 2. The defference in gait patterns between PLS on and off was statistically significant, with an increase in step length by 1.7cm on the involved side; a decrease in foot angle by 4.41 degree on the involved side; and a narrowing of base of support by 1.46cm when PLS were off. In conclusion, this study showed that PLS did not affect the weight bearing distribution and gait patterns of hemiplegic patients. Since, the evaluation method used in this study has limitations in regard to temporal distance gait values. Further studies are required to numerous experiments for subject and extensive study.