Background: Volleyball is one of the most popular sports in the world. It is played by approximately 200 million players worldwide. Volleyball is a sport involving rapid and forceful
movements of the body as a whole, both horizontally and vertically, and because of the large forces involved in such movements it is inevitable that injuries occur. A deficiency in the neuromuscular
control of the hip has been identified as a key risk factor for noncontact ACL, this deficiency will often manifest itself as a medial collapse of the knee (“dynamic knee valgus”) during tasks
involving hip and knee flexion. The aim of this study is screeming for ACL injuries risk in professional voleyball players with bidimentional motion analysis.
Methods: This study is an observational, cross-sectional study. Participants were taught how to perform the dropjump task. They were instructed to drop down onto the ground from a
31-cm box and to immediately perform a maximum vertical jump. They were to keep their arms in the “stop position” (shoulders abducted 45° and elbows flexed 90°) to reduce momentum from arm swing. To
minimize learning effects, 1 practice trial of the drop-jump task were allowed. Following this, 3 consecutive drop-jump trials were conducted. The camera was set up on a tripod 150 cm off the ground
and 330 cm forward of the jumping box. The landing phase was defined as the period from foot contact to toe-off and was manually selected. The guidelines were as follows: “If the patella moves inwards
and ends up medial to the first toe, rate the individual as high risk,” or “If the patella lands in line with the first toe, rate the individual as low risk”.
Results: Developed with 11 professional athletes mean age of 24 (± 5,5 ). From 11 participants 5 were identified as high risk for ACL injury, which means 45% of the team.
Conclusions: It is possible to conclude that screeming for ACL is important to develop a preventive training programme for those specific athletes, and in this way improve the
performance of the individual and the team.