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首页> 外文学位 >Biomechanical analysis of knee joint loading in females who have undergone anterior cruciate ligament reconstruction.
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Biomechanical analysis of knee joint loading in females who have undergone anterior cruciate ligament reconstruction.

机译：膝关节前交叉韧带重建术女性膝关节负荷的生物力学分析。

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摘要

Anterior cruciate ligament reconstruction (ACLR) is often performed to reproduce the function of the original ligament and restore functional stability of the knee joint following ACL injury. Despite substantial improvements in surgical techniques and satisfactory outcomes, individuals who have undergone ACLR have been shown to have a higher risk of developing osteoarthritis (OA) at the knee. To date, the underlying mechanism(s) for the high risk of knee OA in individuals post-ACLR are not fully understood. The primary objectives of this dissertation were to develop a subject-specific EMG-driven model to examine whether females with ACLR demonstrate greater tibiofemoral compressive forces when compared to healthy females, and to examine whether muscle co-contraction and tibiofemoral compressive forces in females who have undergone ACLR can be reduced when trained to utilize a landing strategy that emphasizes greater hip and knee flexion. Chapter III describes the development of an imaging-based subject-specific EMG-driven knee model to quantify the joint forces at the tibiofemoral joint. Using this model, the purpose of Chapter IV was to determine whether females who have undergone ACLR demonstrate greater tibiofemoral compression when compared to healthy females. Results revealed that females who have undergone ACLR exhibit greater peak tibiofemoral compressive forces when compared to healthy controls. The increased tibiofemoral compressive force observed in ACLR subjects was accompanied by increased muscle co-contraction and decreased knee flexion during landing. The purpose of Chapter V was to examine whether utilization of a landing strategy that emphasizes greater hip and knee flexion can decrease tibiofemoral compressive forces in the ACLR population. Consistent with the proposed hypotheses, a decrease in peak tibiofemoral compressive forces was observed when female individuals post-ACLR were trained to land with greater hip and knee flexion. The decreased tibiofemoral compressive force was accompanied by decreased muscle co-contraction at the knee. Overall, the findings of this dissertation support the premise that individuals with ACLR exhibit elevated tibiofemoral compressive force, which may contribute to the high risk of knee OA in this population. The findings of this dissertation also indicate that muscle co-contraction as well as elevated tibiofemoral compressive forces observed in individuals who have undergone ACLR can be reduced by utilizing a landing strategy that encourages greater hip and knee flexion. Interventions aimed at correcting abnormal neuromuscular strategies following ACLR should be emphasized in an effort to minimize the loading at the tibiofemoral joint.
机译：经常进行前交叉韧带重建（ACLR）以重现原始韧带的功能并恢复ACL损伤后膝关节的功能稳定性。尽管外科手术技术有了实质性的改进，并且取得了令人满意的结果，但事实表明，接受ACLR治疗的人膝部发生骨关节炎（OA）的风险较高。迄今为止，ACLR后个体膝关节炎高风险的潜在机制尚不完全清楚。本文的主要目的是建立一个特定对象的肌电图驱动模型，以检查具有ACLR的女性与健康女性相比是否表现出更大的胫股压力，并检查在女性中具有肌肉收缩力和胫股压力的女性经过培训可以利用着陆策略强调髋部和膝盖的屈曲度时，可以减少ACLR经历的时间。第三章介绍了基于影像的受检者特定肌电图驱动的膝关节模型的开发，以量化胫股关节的关节力。使用该模型，第四章的目的是确定与健康女性相比，接受ACLR的女性是否表现出更大的胫股压缩。结果显示，与健康对照组相比，接受ACLR的女性表现出更大的胫股压力峰值。在ACLR受试者中观察到的胫股加压增加，同时伴有肌肉共收缩和着陆时膝盖屈曲减少。第五章的目的是研究采用强调臀部和膝盖更大屈曲的着陆策略是否可以降低ACLR人群的胫股压缩力。与提出的假设一致，当训练ACLR后的女性个体着陆时髋部和膝盖弯曲较大时，观察到最大的股骨股骨受压力降低。胫股压缩力的降低伴随着膝盖肌肉收缩的减少。总体而言，本论文的研究结果支持这样的前提，即ACLR患者表现出较高的胫股压缩力，这可能导致该人群膝OA的高风险。本论文的发现还表明，通过采用鼓励更大的臀部和膝盖屈曲的着陆策略，可以减少在患有ACLR的个体中观察到的肌肉共收缩以及升高的胫股压缩力。应强调旨在纠正ACLR后异常神经肌肉策略的干预措施，以最大程度地减少胫股关节的负荷。

著录项

  • 作者

    Tsai, Liang-Ching.;

  • 作者单位

    University of Southern California.;

  • 授予单位 University of Southern California.;
  • 学科 Health Sciences Rehabilitation and Therapy.;Biophysics Biomechanics.;Engineering Biomedical.
  • 学位 Ph.D.
  • 年度 2011
  • 页码 109 p.
  • 总页数 109
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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