Nemati Zahra, Sanjari Mohammad Ali, Jalali Maryam, Bagheri Fard Abolfazl
Rehabilitation Research Center, Department of Orthotics and Prosthetics, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran.
Rehabilitation Research Center, Department of Basic Rehabilitation Sciences, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran.
Med J Islam Repub Iran. 2022 Feb 1;36:1. doi: 10.47176/mjiri.36.1. eCollection 2022.
Knee extension torque control decreases after anterior cruciate ligament (ACL) rupture. There is a controversy in neuromuscular control changes on the uninvolved side. We intended to evaluate the steadiness and accuracy of quadriceps muscle control in the healthy and deficient sides of people with acute ACL rupture. In this cross-sectional study, thirteen men with ACL rupture (age: 27.8±7.0, body mass index (BMI): 24.7±2.25: 24.7, days from injury: 48.1±21.3) participated in the study. We measured quadriceps force control, which is quantitatively assessed by the standard deviation (SD) of joint torque for a predefined submaximal target. The accuracy of muscular control or performance of quadriceps is commonly quantified by the root mean square of error (RMSE) was also measured. A two-way analysis of variance was conducted to assess SD and RMSE of two levels of quadriceps contraction (30% of muscle voluntary contraction (MVC), 50% of MVC) across both healthy and deficient knees. There was a significant main effect for SD and RMSE of MVC percentage (p<0.001). SD of quadriceps torque in 50% of MVC (1.44 ± 0.13) was higher than 30% of MVC (0.88 ± 0.1). In contrast, there was no significant main effect for SD and RMSE of knee condition. After unilateral ACL rupture, the neuromuscular system becomes defected and quadriceps muscle control is then reduced in the healthy side. Therefore, the healthy side is also vulnerable to ligamentous damage. Besides, with the increasing intensity of physical activities, neuromuscular control decreases and the risk of re-injury rises.
前交叉韧带（ACL）断裂后，膝关节伸展扭矩控制能力下降。未受伤侧的神经肌肉控制变化存在争议。我们旨在评估急性ACL断裂患者健康侧和损伤侧股四头肌控制的稳定性和准确性。在这项横断面研究中，13名ACL断裂男性（年龄：27.8±7.0，体重指数（BMI）：24.7±2.25，受伤天数：48.1±21.3）参与了研究。我们测量了股四头肌力量控制，通过预定义次最大目标的关节扭矩标准差（SD）进行定量评估。股四头肌肌肉控制的准确性或表现通常用误差均方根（RMSE）来量化，也进行了测量。进行了双向方差分析，以评估双侧健康和损伤膝关节在股四头肌两种收缩水平（肌肉自愿收缩（MVC）的30%、MVC的50%）下的SD和RMSE。MVC百分比的SD和RMSE存在显著的主效应（p<0.001）。MVC的50%时股四头肌扭矩的SD（1.44±0.13）高于MVC的30%时（0.88±0.1）。相比之下，膝关节状况的SD和RMSE没有显著的主效应。单侧ACL断裂后，神经肌肉系统出现缺陷，健康侧的股四头肌控制能力随之下降。因此，健康侧也容易受到韧带损伤。此外，随着体育活动强度的增加，神经肌肉控制能力下降且再次受伤的风险上升。
