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首页> 外文期刊>The journal of orthopaedic and sports physical therapy >Anterior tibial translation during different isokinetic quadriceps torque in anterior cruciate ligament deficient and nonimpaired individuals.
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Anterior tibial translation during different isokinetic quadriceps torque in anterior cruciate ligament deficient and nonimpaired individuals.

机译：前交叉韧带缺乏和未受损个体在不同等速四头肌扭矩期间的胫骨前移。

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STUDY DESIGN: Factorial quasi-experimental design. OBJECTIVES: To quantify the effect of different levels of isokinetic concentric and eccentric knee extensor torques on the anterior tibial translation in subjects with anterior cruciate ligament (ACL) deficiency. Electromyogram (EMG) activity of 4 leg muscles was recorded in order to detect any co-activation of extensors and flexors. BACKGROUND: The rehabilitation after an ACL injury is of importance for the functional outcome of the patient. In order to construct a rehabilitation program after that injury, it is important to understand the in vivo relationships between muscle force and tibial translation. METHODS AND MEASURES: Twelve patients with unilateral ACL injury and 11 uninjured volunteers performed 36 repetitions of a quadriceps contraction at different isokinetic concentric and eccentric torque levels, on a KinCom machine (60 degrees x s(-1)), with simultaneous recordings of tibial translation (CA-4000) and EMG activity from quadriceps and hamstrings muscles. Tibial translations and EMG levels were normalized to the maximum of each subject. RESULTS: The individual anterior tibial translation increased with increased quadriceps torque in a similar manner in both quadriceps contraction modes in all legs tested. During concentric mode, translation was similar in all groups, but during eccentric mode, the mean translation was 38% larger in the ACL injured knees. No quadriceps-hamstrings co-activation occurred in any test or group. CONCLUSIONS: An ACL deficient knee can limit the translation within a normal space during concentric muscle activity but not during eccentric activity. That limitation depends on other mechanisms than hamstrings co-activation.
机译：研究设计：析因准实验设计。目的：量化不同水平的等速同心和偏心膝盖伸肌转矩对前交叉韧带（ACL）缺乏者的胫骨前平移的影响。记录4条腿部肌肉的肌电图（EMG）活动，以检测伸肌和屈肌的任何共激活。背景：ACL损伤后的康复对于患者的功能结局至关重要。为了构建该损伤后的康复计划，重要的是要了解肌肉力量和胫骨翻译之间的体内关系。方法和措施：12名单侧ACL损伤患者和11名未受伤的志愿者在KinCom机器（60度xs（-1））上以不同的等速同心和偏心扭矩水平重复进行了四次股四头肌收缩36次，同时记录了胫骨平移（CA-4000）和股四头肌和绳肌的肌电活动。胫骨翻译和肌电图水平标准化到每个受试者的最大值。结果：在所有接受测试的四头肌收缩模式中，胫骨前平移均随着股四头肌扭矩的增加而增加。在同心模式下，所有组的翻译均相似，但在偏心模式下，ACL受伤的膝盖的平均翻译量增加了38％。在任何测试或组中均未发生股四头肌-腿筋共激活。结论：ACL缺陷型膝关节可以在同心肌肉活动期间限制正常空间内的平移，但在偏心活动期间则不能。该限制取决于绳肌共激活以外的其他机制。

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