عنوان مقاله [English]
Background and Aims: Sport skills include landing from high-risk activities. Single-leg landing is a common movement in many sports and is known a major cause of non-contact Anterior Cruciate Ligament (ACL) injuries, and increase in knee external motion in the frontal plane can also aggravate it. The present study was carried out to analyze the effects of different degrees of insole hardness (soft, medium-hard, hard) on joint kinematics of knee in single-leg landing from different heights including 20, 40, and 60 centimeters.
Materials and Methods: A total of 20 male individuals (mass mean: 75.30± 1.03 kg; height: 180.1± 4.19 cm; age: 25.30± 4.29) were selected. Participants were asked to do single-leg landing from different heights (20, 40, and 60 cm) on different kinds of insole in terms of hardness placed inside the shoes in front of a three-dimensional motion analysis system. After data processing using cortex software, maximum parameters of knee flexion and knee valgus were measured. Statistical analyses of data were done using repeated measures test considering a significant level lower than 0.05.
Results: In landing from 20 cm height, soft insole showed the maximum level of knee flexion and minimum level of knee valgus. In landing from 40 cm height, semi-hard insole showed the maximum level of knee flexion and minimum level of knee valgus. Finally, in landing from 60 cm height, hard insole showed the maximum level of knee flexion and minimum level of knee valgus.
Conclusion: The results showed that different degrees of insole hardness influence the knee joints kinematics. More knee flexion and less knee valgus brought about by these insoles can reduce ACL injuries.
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