• Title, Summary, Keyword: KNEE BRACE

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The Effects of Knee Brace on the Knee Muscular Neuro-Biomechanical Variables during the Rebound in Female Highschool Basketball Players (여자 고등학교 농구 선수들이 리바운드 점프 후 착지할 때 무릎보호대가 무릎의 근신경 생체역학적 변인에 미치는 효과)

  • Han, Ki-Hoon;Lim, Bee-Oh
    • Korean Journal of Sport Biomechanics
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    • v.17 no.4
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    • pp.107-113
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    • 2007
  • The purpose of this study were to investigate the effects of knee brace on the knee muscular neuro-biomechanical variables during the rebound in female highschool basketball players. Twelve high school female ($17.9{\pm}0.8years$) basketball players rebound jumped for maximal vertical height to sufficiently stress the anterior cruciate ligament with and without knee brace. Kinematic data were collected to estimate the knee flexion, abduction angles and jump height. The EMG data from the biceps femoris and rectus femoris was used to estimate the ratio of quadriceps muscle activity. Female athletes with knee brace showed more reduced the knee abduction angle and the ratio of quadriceps muscle activity at foot contact phase than without knee brace. In conclusion, Female athletes with brace reduced knee anterior cruciate ligament loads.

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.

Stiffened Effect of Knee Brace of Cross-Beam in Steel Box-girder Bridges (강박스거더교 가로보 니브레이스(Knee Brace)의 보강효과)

  • Gil, Heung Bae;Jang, Gab Chul;Kang, Sang Gyu;Lee, Il Keun
    • Journal of The Korean Society of Civil Engineers
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    • v.29 no.3A
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    • pp.227-234
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    • 2009
  • Recently, a knee brace is usually installed in connection between cross-beam and main-girder of steel box-girder bridges. The knee brace is installed as a structural stiffener and mainly aims to relieve stress at joints and to prevent main-girder from lateral deformation. However, research on the knee brace is insufficient to obviously evaluate the necessity. The stiffened effect of knee brace is determined by using finite element analyses. Stress distribution, stress level of members and deflection of the cross-beam are evaluated by parametric FE analysis for the installation of knee brace and the depth ratio of cross-beam/steel box girder. It is seen from comparison of numerical analysis results that the knee brace installed in cross-beam of steel boxgirders bridges is not efficient as a structural stiffener with respect to stress relief and stiffened effect.

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Analytical Study on the Seismic Retrofit Method of Irregular Piloti Building Using Knee-Brace (Knee - Brace를 활용한 비정형 필로티 건물의 내진보강방안에 대한 해석적 연구)

  • Yoo, Suk-Hyung;Kim, Dal-Gee
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.24 no.1
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    • pp.35-42
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    • 2020
  • Torsional behavior due to the plane irregularities of the piloti building can cause excessive story drift in the torsionally outermost column, which can lead to shear failure of the column. As a seismic retrofit method that can control the torsional behavior of the piloti building, the expansion of RC wall, steel frame or steel brace may be used, but such methods may hinder the openness of the piloti floor. Therefore, in this study, linear dynamic analysis and nonlinear static analysis for piloti buildings retrofitted by knee brace were performed, and seismic performance evaluation and torsion control effect of knee brace were analyzed. The results showed that the shear force of the column increased when the piloti building retrofitted by knee brace, but it was effective in controlling the torsional deformation. In case of retrofit between knee brace and column by 30°, the shear force of the column increased less than that of 60°, and the lateral displacement of column was decreased in the order of □, ◯ and H in cross-section.

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.

Dynamic Analysis of The Knee Brace for Ski Injuried Patient (스키환자용 특수 슬관절보조기의 동특성 해석)

  • 최진영;김명회;장대진;박영필
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.893-898
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    • 2003
  • A new type of the Expanded Knee brace was developed to measure the human knee joint. This instrument was composed of six parts, four arranged for two hinge joints and two pin joint , and two hinge for the expanded system. With a developed instrument, the experimental results obtained the data of Accelerometer, the experimental results obtained of the data FEM, the experimental results obtained the data of Motion Analysis and Force platform. Compared to earlier developed sports type knee brace, new instrument shows its convenience in application and accuracy in measurement.

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Effects of Limited Hyperextension at Knee Joint Using Limited Motion Knee Brace on Balance, Walking in Patients with Hemiplegia (슬관절 움직임 제한 보조기를 이용한 슬관절 과신전 제한이 편마비 환자의 균형과 보행에 미치는 영향)

  • Lee, Eun-Hyuk;Min, Kyung-Ok;Lee, Kang-Sung
    • The Journal of the Korea Contents Association
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    • v.10 no.3
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    • pp.258-265
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    • 2010
  • The purposes of this study was to determine the effects of limited hyperextension at knee joint using Limited Motion Knee Brace on balance and walking in patients with hemiplegia. The subjects of this study were 20 post-stroke hemiplegic patients admitted. Subjects were randomly assigned to either experimental group (Limited Motion Knee Brace group) or control group (manual restriction group). Both groups received traditional physical therapy intervention. The effects of each therapeutic method were evaluated by measurements of gait ability assesment, Berg balance scale (BBS), 10-meter walk speed (10MWS), Timed Up & Go (TUG) Test. The results of this research were as followings: (1) After treatment, there were significant BBS scores differences in both experimental and control group compared with pre-treatment(p<0.05). (2) After treatment, there were significant TUG test scores differences in both experimental and control group compared with pre-treatment (p<0.05). (3) After treatment, there were significant 10MWS differences in both experimental and control group compared with pre-treatment (p<0.05). (4) There were significant BBS scores differences in third and fourth week between experimental and control group (p<0.05). It was concluded that Limited Motion Knee Brace was effective for improving balance and for reducing fatigue for experimental group. Therefore, further studies are required to investigate the effect of knee orthosis for improving balance and walking in patients with hemiplegia.