• 제목, 요약, 키워드: Knee

검색결과 3,123건 처리시간 0.045초

족저굴곡과 무릎 신전 토크를 이용한 보행 재활 훈련용 장하지 보조기 개발 (Development of Knee Ankle Foot Orthosis for Gait Rehabilitation Training using Plantaflexion and Knee Extension Torque)

  • 김경;김재준;허민;정구영;고명환;권대규
    • 제어로봇시스템학회논문지
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    • v.16 no.10
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    • pp.948-956
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    • 2010
  • The purpose of this study was to test the effectiveness of a prototype KAFO (Knee-Ankle-Foot Orthosis) powered by two artificial pneumatic muscles during walking. We had previously built powered AFO (Ankle-Foot Orthosis) and KO (Knee Orthosis) and used it effectively in studies on assistance of plantaflexion and knee extension motion. Extending the previous study to a KAFO presented additional challenges related to the assistance of gait motion for rehabilitation training. Five healthy males were performed gait motion on treadmill wearing KAFO equipped with artificial pneumatic muscles to power ankle plantaflexion and knee extension. Subjects walked on treadmill at 1.5 km/h under four conditions without extensive practice: 1) without wearing KAFO, 2) wearing KAFO with artificial muscles turned off, 3) wearing KAFO powered only in plantaflexion under feedforward control, and 4) wearing KAFO powered both in plantaflexion and knee extension under feedforward control. We collected surface electromyography, foot pressure and kinematics of ankle and knee joint. The experimental result showed that a muscular strength of wearing KAFO powered plnatarfexion and knee extension under feedforward control was measured to be lower due to pneumatic assistance and foot pressure of wearing KAFO powered plnatarfexion and knee extension under feedforward control was measured to be greater due to power assistance. In the result of motion analysis, the ankle angle of powered KAFO in terminal stance phase was found a peak value toward plantaflexion and there were difference of maximum knee flexion range among condition 2, 3 and 4 in mid-swing phase. The current orthosis design provided plantaflexion torque of ankle jonit in terminal stance phase and knee extension torque of knee joint in mid-swing phase.

남녀 대학생들의 수직착지 시 성에 따른 무릎 외반각도의 차이 (Gender Differences of Knee Valgus Angle during Vertical Drop Landing in College Students)

  • 이충휘;박소연;유원규
    • 한국전문물리치료학회지
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    • v.12 no.1
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    • pp.28-35
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    • 2005
  • The purpose of this study was to determine whether gender differences existed in knee valgus kinematics in college students when performing a vertical drop landing. The hypothesis of this study was that females would demonstrate greater knee valgus motion. These differences in knee valgus motion may be indicative of decreased dynamic knee joint control in females. This study compared the initial knee valgus angle and maximum knee valgus angle at the instant of impact on vertical drop landings between healthy men and women. In this study, 60 participants (30 males, 30 females) dropped from a height of 43 cm. A digital camera and two-dimensional video motion analysis software were used to analyze the kinematic data. There was significant difference in the mean knee valgus angle at initial contact landing between the two groups (Mean=$7.88^{\circ}$, SD=$4.24^{\circ}$ in males, Mean=$12.93^{\circ}$, SD=$2.89^{\circ}$ in females). The range of knee valgus angle on landing (Mean=$3.25^{\circ}$, SD=$5.72^{\circ}$ in males, Mean=$11.44^{\circ}$, SD=$6.39^{\circ}$ in females) was differed significantly (p<.05). The maximal angle of knee valgus on landing (Mean=$10.91^{\circ}$, SD=$6.89^{\circ}$ in males, Mean=$24.25^{\circ}$, SD=$6.38^{\circ}$ in females) was also differed significantly (p<.05). The females landed with a larger range of knee valgus motion than the males and this might have increased the likelihood of a knee injury. The absence of dynamic knee joint stability may be responsible for increased rates of knee injury in females. No method for accurate and practical screening and identification of athletes at increased risk of ACL injury is currently available to target those individuals that would benefit from neuromuscular training before sports participation.

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엘리트 여자 핸드볼 선수들의 포지션별 무릎 기능평가와 무릎의 근력 및 근지구력의 상관관계 분석 (Analysis of Correlation Between Knee Function Score and Knee Strength and Muscular Endurance According to the position of Elite Female Handball Athletes)

  • 김현철;박기준
    • 대한물리의학회지
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    • v.15 no.3
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    • pp.127-133
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    • 2020
  • PURPOSE: The study examined the relationship between the knee function score and knee strength and muscular endurance of an elite female handball athletes according to their position in the team. METHODS: Thirty handball athletes participated on the study: 12 front positions, 12 back positions, and five goalkeepers. The knee function score consisted of symptoms, pain, daily activity, sports and recreation, and quality of life. In addition, CSMI (Cybex, USA) was used to measure the strength and muscular endurance of the knee. The muscular strength and muscular endurance were measured at an angular velocity of 60°/s and 180°/s, respectively. RESULTS: The overall items of the knee function score showed a significant difference (p = .017), and goalkeepers had significantly higher scores than the back positions. In addition, significant differences were observed in all five items depending on the position (p ≤ .05). On the other hand, both the flexor and extensor muscles of the knee strength and muscular endurance were not significant. Moreover, there was no correlation between the knee function score and the knee strength and muscle endurance. CONCLUSION: Elite female handball athletes have different knee functions score depending on their position in the team, but the, strength and muscular endurance of the knee were similar for each position. Furthermore, the knee function score showed no correlateion with the strength and muscular endurance of the knee.

응급환자에서 후방십자인대 손상 및 슬대퇴 관절을 관찰하기 위한 보조기구 제작 및 유용성 평가 (The Evaluation of Usefulness New Assistant Device to Observe Posterior Cruciate Ligament Rupture and Patellofemoral Joint Injury in Emergency Patient)

  • 서선열;한만석;전민철;유세종;김용균
    • 대한방사선기술학회지:방사선기술과학
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    • v.33 no.2
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    • pp.93-96
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    • 2010
  • 슬관절 후방십자인대 손상이 의심되는 응급환자의 슬대퇴 관절을 촬영하기 위한 보조기구를 제작하고 그 유용성을 평가하고자 하였다. 실험 방법은 2006년 1월부터 2006년 12월까지 슬관절 손상으로 을지대학병원에 내원한 환자 중 후방십자인대 손상 의증으로 Knee post stress view와 Knee Merchant view 그리고 보조기구를 이용한 Knee post stress view를 모두 촬영하고, 무릎 MRI(Knee MRI)검사를 시행한 17명을 대상으로 하였다. $170{\times}50{\times}70\;cm$의 보조 기구를 제작하였으며 Knee post stress view와 보조기구를 이용한 Knee Seo's view에서 경골의 후방전위 간격을 측정하여 유용성을 평가하였다. 그 결과 보조기구를 이용한 Knee Seo's view가 기존의 Knee post stress view에 비해 후방십자인대 손상 여부의 판단이 더 정확한 것으로 나타났다. 기존 촬영법의 경골 후방전위 간격 차이는 $6.17{\pm}3.04$이었으며, 보조기구를 이용한 촬영법의 경골 후방전위 간격 차이는 $8.74{\pm}4.47$이었다. 결론적으로 자체 제작 보조기구를 이용한 슬대퇴 관절 촬영법은 기존에 슬관절면 손상을 보기 위한 Knee Merchant view와 후방십자인대 손상을 보기 위한 Knee post stress view를 동시에 1회 촬영으로 끝낼 수 있었으며, 기존의 Knee post stress view 보다 후방십자인대 손상 여부를 보다 정확하게 알 수 있었다. 따라서 후방십자인대 및 슬대퇴 관절 손상이 의심되는 응급환자에서 talometer나 MRI 검사의 선행 검사로 유용하게 이용될 수 있을 것으로 사료된다.

Influence of Hip Fracture on Knee Pain During Postoperative Rehabilitation

  • Kim, Hee-Ju;Lee, Seong Jae;Hyun, Jung Keun;Kim, Seo-Young;Kim, Tae Uk
    • Annals of Rehabilitation Medicine
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    • v.42 no.5
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    • pp.682-689
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    • 2018
  • Objective To investigate whether fracture type, surgical procedure, or fracture grade affect knee pain during postoperative rehabilitation after a hip fracture. Methods We conducted a retrospective case-controlled study of 139 patients during postoperative rehabilitation after surgery for hip fractures. Patients were divided into two groups: patients experiencing knee pain during the first week of postoperative rehabilitation, and patients without knee pain. We compared the types of fracture, surgical procedure, and fracture grade between the two groups. Results We enrolled 52 patients (37.4%) with knee pain during the first weeks of postoperative rehabilitation. For type of fracture, knee pain was more common with intertrochanteric fracture than with femur neck fracture (48.8% vs. 21.1%, respectively; p=0.001). For the surgical procedure, there was no significant difference between the groups. For the fracture grade, the grades classified as unstable fractures were more common in the group of intertrochanteric fracture patients with knee pain than in those without knee pain (74.1% vs. 36.4%, respectively; p=0.002). Conclusion Intertrochanteric fracture affected knee pain after hip fracture surgery more than did femur neck fracture, particularly in unstable fractures. Furthermore, there was no difference in each fracture type according to the surgical procedure. Careful examination and management for knee pain is needed in patients with hip fracture surgery.

일측성 슬관절염에 대한 등속성 근기능 평가 및 운동치료의 효과 (Isokinetic Test and the Effect of Exercise Therapy of Ipsilateral Knee Osteoarthritis)

  • 강정훈;나정엽;장재혁;이경일;김권영
    • 한국운동역학회지
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    • v.20 no.1
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    • pp.75-81
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    • 2010
  • Knee osteoarthritis is one of the most prevalent arthritis that weakens the muscles. This study focused on evaluating muscular functionality of knee osteoarthritis subjects. Muscular strengths of muscles around knee and hip joints of middle-aged female subjects aged over 40 suffering from knee osteoarthritis were evaluated by isokinetic dynanometer. Also, relation between the observed muscle imbalance in knee and hip joints and visual analogue scale was investigated. Subjects performed 8-weeks exercise on weakened muscles - particularly on knee extensors and hip abductors - and had their isokinetic muscular functionalities analyzed again. After the 8-weeks exercise, subjects' thigh circumferences were increased, accompanied with muscular strength improvements and decrease in visual analogue scale. Hence we emphasize the importance of exercise for muscular strength enhancement of knee extensors and hip abductors, in rehabilitation programs for knee osteoarthritis.

이동베어링형 인공무릎전치환관절의 생체내의 운동 (In Vivo Kinematics of a Mobile-bearing Total Knee Prosthesis)

  • 이연수;박상진;송은규
    • 대한기계학회:학술대회논문집
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    • pp.1473-1474
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    • 2008
  • In the total knee arthroplasty (TKA), kinematic benefic of a mobile-bearing total knee prosthesis is still arguing. Main reasons for implant failure are loosening and polyethylene wear and should be solved with new designs with mob ile bearings. The kinematics of the knee prosthesis also affects the implant failure. Recently, a second generation of p rostheses with a mobile-bearing was developed. The current study aimed to assess the kinematic path of the 2nd generation mobile knee prosthesis compared to the normal knees. Using 3D/2D registration method, CT-derived 3D knee models were fitted to sequential 2D X-ray images during knee flexion. 3D kinematics of the femur and the tibia were analyzed. The 2nd generation mobile-bearing TKA prosthesis (e.motion, Aesculap, Germany) knees showed less external rotation and knee flexion range compared to the normal knee, but the trend of external rotation was similar each other.

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3차원 보행분석을 통한 무릎 모음 모멘트와 고관절 내외회전의 임상적 특성 (Clinical Characteristics of Hip Joint Rotations and Knee Adduction Moment through 3D Gait Analysis)

  • 김용욱;강승묵
    • 대한통합의학회지
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    • v.5 no.4
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    • pp.41-48
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    • 2017
  • Purpose : The purpose of this study was to verify the relationships among the knee adduction moment, hip rotation range, strength of hip rotators, and Foot Posture Index of healthy young adults. Method : Thirty-two healthy adults(24 male, 8 females) participated in this study. Subjects performed 5 walking trials to evaluate the knee adduction moments using a three-dimensional motion analysis system. Hip rotation ranges and hip rotator strengths were measured using a standard goniometer and a handheld dynamometer, respectively. The mean of three trials of clinical tests was used for data analysis. Results : The first peak knee adduction moment was significantly correlated with the hip rotation ranges and hip rotator strengths (P<.05). The second peak knee adduction moment was showed significant correlations with hip external rotation and rotation ratio. There were no correlations between Foot Posture Index and all knee adduction moments (P>.05). Conclusion : This study suggests that imbalances of the range of motion and strength of the internal and external rotation of the hip joint can affect knee adduction moments. The impact may exacerbate musculoskeletal disorders such as osteoarthritis of the knee. Therefore, further studies should be conducted to evaluate the effects of clinical interventions to correct these imbalances on the reduction of the knee adduction moments in patients with knee osteoarthritis.

무릎관절 뼈관절염 환자의 발과 무릎관절 자세 특성간의 상관관계 (The Correlation Between Foot and Knee Posture Characteristics in Knee Osteoarthritis People)

  • 김성환;김선엽;김호봉
    • 대한물리의학회지
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    • v.7 no.4
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    • pp.433-442
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    • 2012
  • PURPOSE: This study investigated to correlation between foot and knee posture characteristics in knee osteoarthritis patients. METHODS: The subjects of this study were 103 patients with clinically and radiographically-confirmed knee osteoarthritis was investigated using the quadriceps angle (QA), distance of both knee (DBK), ankle dorsiflexion angle (ADA), navicular drop (ND). One-way ANOVA and Pearson's correlation were used to investigate the correlation between foot and knee posture measurements. All of whom agreed to participate in the study. In order to assure the statistical significance of the results, we used for SPSS ver. 18.0 for windows. RESULTS: The results of this study were as follows : 1) There were statistically significant difference in the correlation between QA and DBK. 2) There were statistically significant difference in the correlation between DBK and ADA. CONCLUSION: According the results of this study, patients with osteoarthritis exhibit more genu varus knee posture. Moreover patients with osteoarthritis were not correlation between foot and knee Posture characteristics.

Comparison of Muscle Activity of Vastus Lateralis and Medialis Oblique among Knee Extension Angles at 90°, 135°, 180° in Sitting Position

  • Jeon, InCheol
    • The Journal of Korean Physical Therapy
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    • v.32 no.1
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    • pp.52-57
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    • 2020
  • Purpose: This study compared the muscle activities of the Vastus medialis oblique (VMO) and the Vastus lateralis (VL) at three different knee extension angles: 90°, 135°, and 180° in the sitting position. Methods: Twenty subjects between 20 and 30 years of age participated in the study. A mobile phone application called the Clinometer was used to measure the knee joint angle. Electromyography (EMG) was performed to measure the muscle activities of the VMO and VL muscles during knee isometric extension exercises. The pulling sensor was used to maintain 70% of the maximum strength of the knee extensor continuously in the sitting position. After attaching the EMG sensor, the subjects were asked to perform isometric knee extension exercises randomly among three knee extension angles (90°, 135°, or 180°) in the sitting position. One-way repeated measures analysis of the variance and a Bonferroni post hoc test was used to identify the VMO and VL muscle activity during knee extension angles among 90°, 135°, and 180°. Results: The VMO and VL muscle activities increased with increasing knee extension angle in the sitting position (p<0.01). Conclusions: Knee extension exercise at a 180° angle in the sitting position can be recommended to increase the muscle activity of the VMO and VL muscle activities efficiently.