Effects of Gymnasts Shoes on Risk Factors of Anterior Cruciate Ligament Injuries during Drop Landing in Female Gymnasts

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Objective: The aim of this study was to analyze the net joint moment and joint power of the lower extremity during squat in female patients with genu varum.Method: Eight female patients with genu varum were asked to do regular squats, and their net joint moment and joint power were compared to those of another eight female participants with straight legs. Their video recordings and ground reaction force data were analyzed to be used as a theoretical evidence of squatting effectively for female patients with genu varum.Results: Squats had a higher impact on internal knee joint rotation and ankle joint flexion moments in the genu varum group than in the straight leg group due to their weak and short hip joint muscles. Conclusion:There is a need to develop a squat movement that is appropriate for women with genu varum in order to distribute overload efficiently among the hip, knee, and ankle joints and to strengthen the muscles in a balanced way.

Section: ) Ground Reaction Forcesmentioning

confidence: 99%

Analysis of Lower Extremity Joint Moment and Power during Squat in Female Patients with Genu Varum

Jeong¹,

Lim²

2016

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“…The Effect Analysis of Postural Stability on the Inter-Segmental Spine Motion according to Types... 377 (Izzo et al, 2012;Lim & Kim, 2012;Joo et al, 2014). …”

Section: 서 론 인체는 체간(Trunk)과 사지(Limbs)로 구분되지만 걷기나 달리기 등 일반적으로 신체활동은mentioning

confidence: 99%

The Effect Analysis of Postural Stability on the Inter-Segmental Spine Motion according to Types of Trunk Models in Drop Landing

Yoo¹

2014

The purpose of this study was to assess the inter-segmental trunk motion during which multi-segmental movements of the spinal column was designed to interpret the effect of segmentation on the total measured spine motion. Also it analyzed the relative motion at three types of the spine models in drop landing. A secondary goal was to determine the intrinsic algorithmic errors of spine motion and the usefulness of such an approach as a tool to assess spinal motions. College students in the soccer team were selected the ten males with no history of spine symptoms or injuries. Each subject was given a fifteen minute adaptation period of drop landing on the 30cm height box. Inter-segmental spine motion were collected Vicon Motion Capture System (250 Hz) and synchronized with GRF data (1000 Hz). The result shows that Model III has a more increased range of motion (ROM) than Model I and Model II. And the Lagrange energy has significant difference of at E3 and E4 (p<.05). This study can be concluded that there are differences in the three models of algorithm during the phase of load absorption. Especially, Model III shows proper spine motion for the inter-segmental joint motion with the interaction effects using the seven segments. Model III shows more proper observed values about dynamic equilibrium than Model I & Model II. The findings have shown that the dynamic stability strategy of Model III toward multi-directional spinal motion supports for better function of the inter-segmental motor-control than the Model I and Model II.

“…3차원 좌표 계산 시 발생되는 노이 즈(noise)를 제거하기 위하여 Butterworth 4th low-pass digital filters를 사용하였으며, 차단주파수는 9 Hz로 설정하 였다(Ford, Myer & Hewett, 2003). (Ford et al, 2003;Myer, Ford, & Hewett, 2002;Lim et al, 2012). Hewett과 Ford (2004)는 횡단면에서 무릎 동작을 조절하지 못하는 매우 고난도의 위험 과제는 무릎의 외반 동작을 무너뜨리 고 전방십자인대 파열을 일으킬 수 있다고 하였다 (Han & Lim, 2007;Yang & Lim, 2014).…”

Section: 자료 분석unclassified

“…Hewett과 Ford (2004)는 횡단면에서 무릎 동작을 조절하지 못하는 매우 고난도의 위험 과제는 무릎의 외반 동작을 무너뜨리 고 전방십자인대 파열을 일으킬 수 있다고 하였다 (Han & Lim, 2007;Yang & Lim, 2014). 선행연구의 결과와 차 이가 나는 이유는 동작(농구 리바운드 점프 후 착지 및 한 발 드롭 착지 vs 배구 스파이크 도약)과 지면에 접촉하는 방식(양발 vs 한발)의 차이 때문인 것으로 판단된다 (Han & Lim, 2007;Lim et al, 2012) (Lim et al, 2013;Yang & Lim, 2014). 무릎 최대 외전모멘트가 증가된 여자 선수들 은 관절을 조절하는 능력이 감소되어 무릎 부상이 증가되 었으며, 이는 무릎 관절을 조절하는 능력이 감소되어 무릎 의 굴곡근(hamstrings), 외전근(abductors) 및 내전근 (adductors)의 수축 형태에도 영향을 미쳐서 근신경 조절 능력이 감소하게 되고 이는 무릎 관절을 경직(stiffness) 시 켜서 전방십자인대 부상이 증가한다고 하였다 (Han & Lim, 2007;Ford et al, 2003;Lim et al, 2013;Yang & Lim, 2014).…”

Section: 자료 분석unclassified

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Effects of Knee Brace on the Anterior Cruciate Ligament Injury Risk Factors during Spike Take Off in Female Volleyball Players

양창수¹,

임비오

2014

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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.