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首页> 外文期刊>Journal of athletic training >Knee-Extension Torque Variability and Subjective Knee Function in Patients With a History of Anterior Cruciate Ligament Reconstruction
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Knee-Extension Torque Variability and Subjective Knee Function in Patients With a History of Anterior Cruciate Ligament Reconstruction

机译：膝盖延伸扭矩变异性和主观膝关节患者患者前十字韧带重建历史

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Context: When returning to physical activity, patients with a history of anterior cruciate ligament reconstruction (ACL-R) often experience limitations in knee-joint function that may be due to chronic impairments in quadriceps motor control. Assessment of knee-extension torque variability may demonstrate underlying impairments in quadriceps motor control in patients with a history of ACL-R. Objective: To identify differences in maximal isometric knee-extension torque variability between knees that have undergone ACL-R and healthy knees and to determine the relationship between knee-extension torque variability and self-reported knee function in patients with a history of ACL-R. Design: Descriptive laboratory study. Setting: Laboratory. Patients or Other Participants: A total of 53 individuals with primary, unilateral ACL-R (age = 23.4 ± 4.9 years, height = 1.7 ± 0.1 m, mass = 74.6 ± 14.8 kg) and 50 individuals with no history of substantial lower extremity injury or surgery who served as controls (age = 23.3 ± 4.4 years, height = 1.7 ± 0.1 m, mass = 67.4 ± 13.2 kg). Main Outcome Measure(s): Torque variability, strength, and central activation ratio (CAR) were calculated from 3-second maximal knee-extension contraction trials (90° of flexion) with a superimposed electrical stimulus. All participants completed the International Knee Documentation Committee (IKDC) Subjective Knee Evaluation Form, and we determined the number of months after surgery. Group differences were assessed using independent-samples t tests. Correlation coefficients were calculated among torque variability, strength, CAR, months after surgery, and IKDC scores. Torque variability, strength, CAR, and months after surgery were regressed on IKDC scores using stepwise, multiple linear regression. Results: Torque variability was greater and strength, CAR, and IKDC scores were lower in the ACL-R group than in the control group (P < .05). Torque variability and strength were correlated with IKDC scores (P < .05). Torque variability, strength, and CAR were correlated with each other (P < .05). Torque variability alone accounted for 14.3% of the variance in IKDC scores. The combination of torque variability and number of months after surgery accounted for 21% of the variance in IKDC scores. Strength and CAR were excluded from the regression model. Conclusions: Knee-extension torque variability was moderately associated with IKDC scores in patients with a history of ACL-R. Torque variability combined with months after surgery predicted 21% of the variance in IKDC scores in these patients.
机译：背景信息：返回身体活动时，患有前十字韧带重建（ACL-R）的患者经常在膝关节功能中经历局限性，这可能是由于慢性血管电机控制中的慢性损伤。膝盖延伸扭矩变异性的评估可以展示患者患者患者Quadriceps电机控制中的潜在损伤。目的：识别经过ACL-R和健康膝盖的膝盖之间最大等距膝盖延伸扭矩变异性的差异，并确定ACL-R历史患者膝盖延伸扭矩变异性和自我报告的膝关节功能之间的关系。设计：描述性实验室研究。设置：实验室。患者或其他参与者：共有53名具有初级，单侧ACL-R（年龄= 23.4±4.9岁的个体，身高= 1.7±0.1米，质量= 74.6±14.8千克）和50个个体，没有实质性下肢损伤的历史或手术作为控制（年龄= 23.3±4.4岁，身高= 1.7±0.1米，质量= 67.4±13.2千克）。主要结果测量：扭矩可变性，强度和中央激活比（汽车）由3秒的最大膝盖延伸收缩试验（90°屈曲）具有叠加的电刺激。所有参与者完成了国际膝关节文件委员会（IKDC）主观膝盖评估表，我们确定了手术后的月数。使用独立样本T测试评估组差异。在扭矩变异性，强度，汽车，手术后数月和IKDC分数计算相关系数。逐步多次线性回归在IKDC分数上回归手术后的扭矩变异性，强度，汽车和数月。结果：ACL-R组扭矩变异性更大，力量，汽车和IKDC分数低于对照组（P <.05）。扭矩变异性和强度与IKDC评分相关（P <.05）。扭矩变异性，强度和汽车彼此相关（P <.05）。扭矩变异性单独占IKDC分数的差异的14.3 ％。扭矩变异性和手术后的月数的组合占IKDC分数的差异的21％。力量和汽车被排除在回归模型之外。结论：膝关节延伸扭矩变异性与ACL-R历史患者的IKDC分数适度相关。扭矩变异性联合手术后几个月预测了这些患者IKDC评分的21％。

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