• Title, Summary, Keyword: Knee

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Comparisons of the gait characteristics depended on amputation length of the Unilateral Trans-Tibial Prostheses (편측하퇴의지의 절단 길이에 따른 보행 특성 비교)

  • You Jae-eung;Jung Seok
    • The Journal of Korean Physical Therapy
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    • v.15 no.3
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    • pp.166-172
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    • 2003
  • The aim of this study is to present the basic reference data of age and specific gait parameters for comparisons of the gait characteristics depended on amputation length of the Unilateral Trans-Tibial Prostheses. The basic gait parameters were extracted from 10 Adult, and 20 below knee(B/K) patients, 50 to 60 years of age using VICON 512 Motion Analyzer. The results were as follows; 1. The mean Cadence of the above knee(A/K) patients and below knee(B/K) patients were $87.77{\pm}8.64$ steps/min, to $99.84{\pm}11.14$ steps/min.(p<0.05) 2. The mean Walking Speed of the above knee(A/K) patients and below knee(B/K) patients were $0.84{\pm}0.15$ m/s, to $0.96{\pm}0.25$ m/s.(p>0.05) 3. The mean Stride Length of the above knee(A/K) patients and below knee(B/K) patients were $1.14{\pm}0.14\;m$, to $1.14{\pm}0.22m$.(p>0.05) 4. The mean maximal angles of joint on the hip flexion motion for different above knee(A/K) patients and below knee(B/K) patients were $34.75{\pm}10.18_{\circ}$, to $32.32{\pm}6.34_{\circ}$.(p>0.05) 5. The mean maximal angles of joint on the knee flexion motion for different above knee(A/K) patients and below knee(B/K) patients were $66.97{\pm}15.08_{\circ}$, to $52.65{\pm}9.21_{\circ}$. (p<0.05) 6. The mean maximal angles of joint on the ankle dorsi-flexion motion for different above knee(A/K) patients and below knee(B/K) patients were $14.41{\pm}4.82_{\circ}$, to $10.04{\pm}3.49_{\circ}$.(p>0.05) 7. The mean maximal angles of joint on the ankle plantar-flexion motion for different above knee(A/K) patients and below knee(B/K) patients were $5.77{\pm}3.17_{\circ}$, to $2.75{\pm}4.49_{\circ}$.(p>0.05)

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Effects of Knee Brace on the Anterior Cruciate Ligament Injury Risk Factors during Spike Take Off in Female Volleyball Players (여자 배구 선수들의 스파이크 도약 시 무릎보호대가 전방십자인대 부상위험 요인에 미치는 영향)

  • Yang, Chang-Soo;Lim, Bee-Oh
    • Korean Journal of Sport Biomechanics
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    • v.24 no.1
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    • pp.27-33
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    • 2014
  • In volleyball, the most common injuries are anterior cruciate ligament (ACL) tears. For this reason, volleyball players frequently use knee brace as prophylactic and rehabilitation measures. The purpose of the study was to investigate the effects of knee brace on anterior cruciate ligament injuries risk factors during spike take off in female volleyball players. Fifteen female volleyball players were recruited and performed randomly spike take off with and without knee brace. Kinematics and ground reaction data were collected to estimate the anterior cruciate ligament injuries risk factors. The ACL risk factors are knee maximum flexion angle, thigh maximum adduction angle, thigh maximum internal rotation angle, shank maximum abduction angle, shank maximum external rotation angle, knee maximum extension moment and knee maximum abduction moment. Data were analyzed with paired samples t-test with Bonfferoni collection. Female volleyball players with knee brace had no significant results in knee maximum flexion angle, thigh maximum adduction angle, thigh maximum internal rotation angle, shank maximum abduction angle and shank maximum external rotation angle compare to without knee brace. Female volleyball players, however, with knee brace showed more reduced knee maximum extension moment and knee maximal abduction moment than without knee brace. In conclusion, Female volleyball players with knee brace reduced anterior cruciate ligament stress.

Muscle Strength Ratio and Q-angle in Patients With Osteoarthritis of The Knee: A Comparative Study With Healthy Persons (슬관절 골관절염 환자의 슬관절 주위근의 근력비와 Q-각과의 관계)

  • Kim, Suhn-Yeop
    • Physical Therapy Korea
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    • v.12 no.1
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    • pp.45-54
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    • 2005
  • The quadriceps-angle (Q-angle) and the ratio of hamstring/quadriceps (H/Q) are important for the stability of the knee and for protection from excessive stress. The aim of this study was to examine the association between Q-angle and H/Q ratio with and without knee osteoarthritis. We compared knee osteoarthritis patients with symptom-free women. The mean age of the patients in the arthritis group (25 women, osteoarthritis) was 59.7 years. The non-arthritis group consisted of 25 women with a mean age of 55.2 years. Of the 25 women with osteoarthritis, 5 had the condition in their left knee, 5 had it in their right knee, and 15 had it on both sides. There was no significant difference in the knee Q-angle of the left and right knees of the arthritis group and the non-arthritis-group (p>.05). The strength of all the muscles around the involved right knee in the arthritis group was significantly weaker than that of the non-arthritis group (p<.05). However, in the left knee, only the strength of the knee extensors and internal rotators was significantly weaker than that of the non-arthritis group (p<.05). The Q-angle was not associated with the H/Q ratio and internal rotators/external rotators ratio of the involved knee in the arthritis group (p>.05). Neither was the Q-angle associated with the pain level of an involved knee in the arthritis group (p>.05). The knee pain was not associated with the H/Q ratio of the involved knee in the arthritis group (p>.05). The Q-angle was not associated with the ratio of H/Q and pain level of the involved knee in the osteoarthritis women.

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Development of the Automatic Knee Joint Control System for a Knee-Ankle-Foot Orthosis Using an Electromechanical Clutch (전자-기계식 클러치를 이용한 장하지 보조기용 무릎관절 자동 제어 장치의 개발)

  • 이기원;강성재;김영호;조강희
    • Journal of Biomedical Engineering Research
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    • v.22 no.4
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    • pp.359-368
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    • 2001
  • A new knee-ankle-foot-orthosis(KAFO) which uses an automatically-controlled electromechanical wrap spring clutch for the knee joint was developed in the present study. It was found that the output voltage from the foot switches of the developed KAFO was proportionally increased with respect to the applied load. The output voltage from the infrared sensor also decreased as the knee flexion angle increased. The knee joint system for the new KAFO weighs only 780g lighter than any other commercially available developed system. In addition, the solenoid reduces the reaction time for the automatic control of the knee joint. The static torque of the clutch was measured for three persons, and it satisfied the normal knee extension moment during the pre-swing. Three-dimensional gait analyses for three different gait patterns (normal gait, locked-knee gait, controlled-knee gait) from five normal subjects were conducted. Controlled-knee gait showed the maximum knee flexion angle of 40.56$\pm9.55^{\circ}$ and the maximum knee flexion moment of 0.20$\pm$0.07Nm/kg at similar periods in the normal gait. Our KAFO system satisfies both stability during stance phase and free knee flexion during the swing phase at the proper period during the gait cycle. Therefore, our KAFO system would be very useful in various low extremity orthotic applications.

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Pain Evaluation in Patients with Knee Osteoarthritis (퇴행성슬관절염 환자의 통증에 대한 연구)

  • Yoon, Dae-Yeon
    • Journal of Physiology & Pathology in Korean Medicine
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    • v.25 no.4
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    • pp.715-720
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    • 2011
  • We performed this study to assess pain in patients with knee osteoarthritis. Participants were 120 Patients(men 26 and women 94) with knee osteoarthritis. Pain evaluations were conducted using survey composed of 12 items by interview with oriental medicine doctor. Collected data were analyzed by IBM SPSS Statistics 19.0. Women were 3.8 times more than men(21.7% vs 78.3%). Approximately 80% of participants were overweight and obesity. Descending stair is most painful action for knee osteoarthritis patients. The average degree of knee pain was more than moderate. 5. People diagnosed as arthritis before had the much higher knee pain than never diagnosed before. This study showed female gender, overweight and obesity were associated with the risk of knee arthritis and participants complained knee pain more than moderate. It is hoped that our findings provide information that help the treatment of knee osteoarthritis.

Activity of Knee Flexors and Extensors on Change of Ankle Joint Position (발목관절 자세 변화에 대한 무릎관절 굽힘근과 폄근의 활성도)

  • Kwon, Yu-Jeong;Lee, Hyun-Ok
    • PNF and Movement
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    • v.11 no.2
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    • pp.111-117
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    • 2013
  • Purpose : The purpose of this study was to examine the activity of the knee flexor and extensor with ankle plantar flexion and dorsiflexion. Methods : A total of 18 subjects(Male 6, female 12) performed 4 lower extremity patterns of PNF and the activities of the vastus medialis oblique, rectus femoris, vastus lateralis, biceps femoris, semitendinosus ipsilateral sides were measured using electromyography. Results : During 4 lower extremity patterns of PNF, knee flexor and extensor muscle activity were significantly difference. Knee extensors were shown to be higher knee extension and ankle dorsiflexion combined pattern. Knee flexors were shown to be higher knee flexion and ankle plantarflexion combined pattern. Conclusion : We suggest that it is efficient to strengthening of knee extensors with ankle dorsiflexion and to strengthening of knee flexors with ankle plantar flexion. Also, for the functioning as toe standing, we have to choice appropriate movement pattern.

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On the characteristics and seismic study of Hat Knee Bracing system, in steel structures

  • JafarRamaji, Issa;Mofid, Massood
    • Steel and Composite Structures
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    • v.13 no.1
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    • pp.1-13
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    • 2012
  • In this study, a new structural bracing system named 'Hat Knee Bracing' (HKB) is presented. In this structural system, a special form of diagonal braces, which is connected to the knee elements instead of beam-column joints, is investigated. The diagonal elements provide lateral stiffness during moderate earthquakes. However the knee elements, which is a fuse-like component, is designed to have one plastic joint in the knee elements for dissipation of the energy caused by strong earthquake. First, a suitable shape for brace and knee elements is proposed through elastic studying of the system and several practical parameters are established. Afterward, by developing applicable and highly accurate models in Drain-2DX, the inelastic behavior of the system is carefully considered. In addition, with inelastic study of the new bracing system and comparison with the prevalent Knee Bracing Frame system (KBF model) in nonlinear static and dynamic analysis, the seismic behavior of the new bracing system is reasonably evaluated.

The Effects of the Manual Intervention and Self Corrective Exercise Models of General Coordinative Manipulation on the Distorsional Leg (전신조정술의 맨손 중재와 자가교정운동 모형이 휜 다리의 교정에 미치는 영향)

  • Kim, Yunseo;Moon, Sangeun
    • Journal of The Korean Society of Integrative Medicine
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    • v.3 no.1
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    • pp.29-39
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    • 2015
  • Purpose: The purpose of this study was to analyze the effect of the manual intervention and self corrective exercise models of GCM(General Coordinative Manipulation) on the groups bow-knee and knock-knee. Methods: GCM Center of 23 members were divided into the two different groups. 12 members of group bow-knee and 11 members of group knock-knee applied to each manual intervention and self corrective exercise models of GCM. Two different groups were applied to 1 cycle a day for 4 weeks, 3 times a week. Results: The effect of manual intervention and self corrective exercise models of GCM on the groups bow-knee and knock-knee was significant(z<.05). The relationship between groups bow-knee and knock-knee was no significant(z>.05). Conclusion: the manual intervention and self corrective exercise models of GCM was contributed in the Correct recovery of bow-knee and knock-knee(z<.05).

A Simulation System of Total Knee Replacement Surgery for Extracting 3D Surgical Parameters (슬관절 전치환술용 3차원 시술변수 추출 시스템)

  • Jun, Yong-Tae
    • Korean Journal of Computational Design and Engineering
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    • v.16 no.5
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    • pp.315-322
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    • 2011
  • The goal of total knee replacement (TKR) surgery is to replace patient's knee joint with artificial implants in order to restore normal knee joint functions. Since mismatched knee implants often cause a critical balancing problem and short durability, designing a well-fitted implant to a patient's knee joint is essential to improve surgical outcomes. We developed a software system that three-dimensionally (3D) simulates TKR surgery based upon 3D knee models reconstructed from computed tomography (CT) imaging. The main task of the system was to extract precise 3D anatomical parameters of a patient's knee that were directly used to determine a custom fit implant and to virtually perform TKR surgery. The virtual surgery was simulated by amputating a 3D knee model and positioning the determined implant components on the amputated knee. The test result shows that it is applicable to derive surgical parameters, determine individualized implant components, rehearse the whole surgical procedure, and train medical staff or students for actual TKR surgery. The feasibility and verification of the proposed system is described with examples.

Design and Analysis of Above Knee Prosthetic Leg Using MR Damper (유동모드 MR 댐퍼가 구비된 대퇴의족의 설계 및 해석)

  • Park, Jinhyuk;Kang, Je-Won;Choi, Seung-Bok
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.26 no.2
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    • pp.165-171
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    • 2016
  • A prosthetic knee for above-knee (AK) amputee is categorized into passive and active type. The passive prosthetic knee is generally made by elastic material. Although AK amputee can easily walk by using passive prosthetic leg, knee joint motions are not similar to ordinary persons. The active prosthetic leg can control the knee angle owing to the actuator and microprocessor. However, the active type is not cost-effective and the stability may be lost due to the malfunction of sensors. In order to resolve these disadvantages of passive and active type, a semi-active prosthetic knee which can control the knee angle is proposed in this work. The proposed semi-active one requires a less input energy but provides active type performance. In order to achieve this goal, in this work, a semi-active prosthetic knee using magneto-rheological (MR) damper for AK amputees is designed. The MR damper can support the weight of body by using less energy than actuator of active prosthetic. It can control knee angle by inducing the magnetic field at the time of stance phase. This salient characteristic is evaluated and presented in this work.