عنوان مقاله [English]
Background and Aim: Valgus defect is one of the most common neuromuscular defects that is involved in causing noncontact damage to the anterior cruciate ligament. Due to the prevalence of noncontact anterior cruciate ligament injury the present study aimed to investigate the effect and durability of neuromuscular training program on knee valgus, range of motion and strength of selected lower limb muscles in teenage soccer with Dynamic Knee Valgus defect.
Materials and Methods: The present study is quasi experimental. The statistical population of this study included adolescent soccer players with dynamic knee valgus defect who were purposefully selected and randomly divided into two groups of control (Age: 12.50 ± 0.67 years, height: 1.70 ± 0.06 m, weight: 56.41 ± 5.46 kg, body mass index: 19.49 ± 1.57 kg/m2) and training control (Age: 12.23 ± 0.59 years, height: 1.67 ± 0.10 m, weight: 53.07 ± 8.96 kg, body mass index: 18.83 ± 1.54 kg/m2). In this study, dynamic knee valgus was assessed by Squats test and Valgus angle were assessed by landing-jump test and with the help of Kinovea software. The strength and range of motion of the abduction and external rotation of the thigh, dorsiflexion and plantar flexion of the ankle were also evaluated with MMT and goniometer, respectively. After determining the variables in the pre-test, the subjects in the training group performed neuromuscular exercises for 8 weeks and the control group also took part in the specific physical fitness program of Shahin Amol team. At the end of the course, evaluations were performed again in two groups. To investigate the differences, repeated measures analysis and Bonferroni post hoc test were used at a significance level of 0.05. All statistical operations were performed by SPSS software version 24.
Results: The results between the control and training groups showed a significant difference in valgus angle (P=0.001), abduction range of motion (P=0.01) and hip external rotation (P=0.01), dorsiflexion with a straight knee (P=0.001) and flexion (P=0.001), abduction strength (P = 0.002) and external rotation of the hip (P=0.01) and plantar flexion of the ankle (P=0.03). But the results of this test did not show any difference in the variables of plantar flexion range of motion and ankle dorsiflexion strength (P>0.05). Also, after one month, the results showed the persistence of the effect of exercises in the variables of abduction and external rotation of the hip, dorsiflexion of the ankle with a straight and bent knee, and the strength of dorsiflexion and plantar flexion of the ankle.
Conclusion: The use of neuromuscular exercises in this study, by affecting the strength and range of motion, could reduce the risk of Non-contact anterior cruciate ligament injury. Based on the results of using the neuromuscular program, the current study can be suggested as an effective program in the pre-pubertal period and in soccer with dynamic knee valgus of ankle origin.