...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Biomechanics >STRUCTURAL CAPACITY OF THE KNEE TO ANTERIOR CRUCIATE LIGAMENT FAILURE DURING QUADRICEPS CONTRACTION - AN IN VIVO STUDY IN THE RAT
【24h】

STRUCTURAL CAPACITY OF THE KNEE TO ANTERIOR CRUCIATE LIGAMENT FAILURE DURING QUADRICEPS CONTRACTION - AN IN VIVO STUDY IN THE RAT

机译：股四头肌收缩期间膝关节对交叉韧带断裂的结构能力-在大鼠体内的研究。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The effect of quadriceps contraction on the structural capacity of the knee joint loaded to anterior cruciate ligament (ACL) failure was studied in an in vivo rat model. In both knees of 20 rats the joint capsule and ligaments, except the ACL, were cut and the menisci resected by microsurgery. The rats were randomized to destructive testing of their ACLs either by femorotibial distraction or by anterior tibial translation at a displacement rate of 2.5 mm s(-1) (60% s(-1)). The knee flexion during testing was 60 degrees. During loading of the right ACL, quadriceps contraction was induced by electrical stimulation of the femoral nerve. As control, the ACL of the left knee was loaded with relaxed quadriceps. The ultimate load for the knee to ACL failure when tested in tension by femorotibial distraction during quadriceps contraction was 140% higher than tested with the muscles relaxed (p = 0.0001). Energy absorption at failure during muscle contraction was 274% higher (p = 0.0001), and the linear stiffness increased by 59% (p = 0.0004). During testing by anterior tibial translation, neither linear stiffness nor ultimate load changed significantly, but the energy absorbed at failure was 46% (p = 0.02) higher during quadriceps contraction compared to testing with the quadriceps relaxed. These results showed that quadriceps contraction substantially increased the load carrying capacity of the rat knee subject to ACL failure when loaded by femorotibial distraction, but less when it was loaded by anterior tibial translation. Copyright (C) 1996 Elsevier Science Ltd. [References: 28]
机译：在体内大鼠模型中研究了股四头肌收缩对加载至前交叉韧带（ACL）失败的膝关节结构能力的影响。在20只大鼠的双膝中，除ACL外，均切开关节囊和韧带，并通过显微外科手术切除半月板。通过股骨胫骨牵引或胫骨前移以2.5 mm s（-1）（60％s（-1））的移位率将大鼠随机分为ACL破坏性试验。测试期间膝盖弯曲度为60度。在右ACL加载过程中，股神经电刺激引起股四头肌收缩。作为对照，左膝的ACL装有放松的股四头肌。在股四头肌收缩过程中通过股骨dis撑进行张力测试时，膝关节承受ACL衰竭的最终负荷比肌肉放松时的测试负荷高140％（p = 0.0001）。肌肉收缩失败时的能量吸收高274％（p = 0.0001），线性刚度增加59％（p = 0.0004）。在胫骨前平移测试期间，与股四头肌放松测试相比，股四头肌收缩过程中的线性刚度和极限载荷均无明显变化，但在失败时吸收的能量高出46％（p = 0.02）。这些结果表明，股四头肌牵引使股四头肌收缩显着增加了遭受ACL衰竭的大鼠膝盖的负荷承载能力，而胫骨前平移负荷使股四头肌收缩负荷较小。版权所有（C）1996 Elsevier Science Ltd. [引用：28]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号