Specifically, athletes with poor glutes and hamstring activation are more likely to collapse the knee during a landing and then, potentially increasing the risk of non-contact ACL injury 14. Within neuromuscular system, the hip and the knee muscles seem to have a crucial role to prevent the dynamic knee valgus. The main cause of the DKV are neuromuscular control deficits and, therefore, injury prevention and rehabilitation strategies are currently focusing on improving neuromuscular control in order to avoid this injury mechanisms 13. Many studies have measured the dynamic knee valgus in the sagittal plane using 2D video-analyisis 9, 10, 11, 12. The DKV is a medial collapse of the knee resulting in a hip adduction and internal rotation, tibial abduction and medial knee displacement which increases the ACL strain 8. Video-analysis studies have described the dynamic knee valgus (DKV) during landing, pivoting or deceleration maneuvers as the most common ACL injury in sports as football, basketball or handball 4, 5, 6, 7. Several authors have suggested that most of these injuries occur by non-contact mechanisms 3. This data is significantly higher among professional athletes (ranging from 150 to 370 injuries per 100,000 person-years) and amateur athletes (ranging from 30 to 162 injuries per 100,000 person-years) 2. The anterior cruciate ligament (ACL) injury is a common injury in general population with an annual incidence of 68.6 per 100,000 person-years 1. The DKV control seems to be non-correlated with isolated hip and knee muscles NMR so this suggests it is more about Central Nervous System activity than about isolated muscles NMR. This study shows normative and correlational data about dynamic knee valgus, tensiomyography and myotonometry for healthy and active males. No significant correlation was observed between DKV and hip and knee muscles NMR. Right and left limbs were both performed and analyzed independently.

DKV was measured using Kinovea software during a Single-Legged Drop Jump test and NMR was measured using tensiomyography and myotonometry for gluteus maximum, biceps femoris, semitendinosus, lateral and medial gastrocnemius. Dynamic Knee-Valgus angle and lower limb posterior chain muscles Neuromuscular Response. The study was carried out among 50 active, non-injured males. The hypothesis is that DKV could be correlated with hip NMR. This study aimed to give normative and correlational data about DKV and hip and knee neuromuscular response (NMR) among healthy active males. Hip and knee muscles seem to have a crucial role to prevent the dynamic knee valgus. The dynamic knee valgus (DKV) during different sport maneuvers has been widely described as risk factor to develop an anterior cruciate ligament injury.

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