Differences in the Dominant and Non-Dominant Knee Valgus Angle in Junior Elite and Amateur Soccer Players after Unilateral Landing (original) (raw)
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The Open Sports Sciences Journal
Introduction: There is a high incidence of Anterior Cruciate Ligament (ACL) injuries in soccer and 37% of this happens during landing after a jumping event. The measure of valgus knee moment during landing of a Drop Jump (DJ) has been considered a gold standard test to predict the risk of ACL injury in young athletes. Furthermore, researchers have used 2D frontal angle of the knee trying to make a practical tool to evaluate this injury risk, however, to the best of our knowledge, there is no studies about the relationship between mechanical load and 2D dynamic knee valgus parameters. Purpose: To verify the relationship between kinetics and kinematics ACL injury risk factors: the GRF and the a) peak knee valgus; b) valgus knee displacement in soccer players wearing soccer boots landing on an official synthetic turf. Methods: Twenty Brazilian soccer players, 15-17 years old, with 176.6 ± 6.4 cm of height and 67.4 ± 8.1 kg of body mass participated in this study. Following familiarizat...
Physical treatments, 2022
Dynamic knee valgus and poor technique during landing are not only key risk factors for lower extremity injuries especially knee injury, but also can reduce the performance of athletes in the field. Sportsmetrics soccer training is one of the successful knee injury prevention and enhancement performance protocols for female soccer players. Because the effect of sportsmetrics soccer training has not been investigated on the performance and knee valgus during landing in female soccer players, we aimed to investigate this subject. Methods: The current field-trial study was conducted on 24 female soccer players with dynamic knee valgus that were randomly divided into two groups: the training group (TG) and the control group (CG). The assessment tests were the agility t-test, 40-yard test, vertical jump test, double leg squat test, and valgus landing error scoring system test (LESS). The TG group participated in sportsmetrics soccer training regularly for 6 weeks, three 90-min sessions a week. Analysis of covariance was used to analyze the obtained data (P<0.05). Results: Six weeks of sportsmetrics soccer training in the TG group not only reduced dynamic knee valgus during landing (51% reduction, F=171.8, P=0.01) but also improved performance factors significantly: agility (0.50 s reduction, F=23.29, P=0.01), power (2.50 cm increase, F=13.20, P=0.01) and speed (0.30 s reduction, F=23.66, P=0.01). Conclusion: Sportsmetrics soccer training is strongly suggested for soccer players exposed to knee injuries due to dynamic knee valgus during landing.
Physical Treatments, 2022
Dynamic knee valgus and poor technique during landing are not only key risk factors for lower extremity injuries especially knee injury, but also can reduce the performance of athletes in the field. Sportsmetrics soccer training is one of the successful knee injury prevention and enhancement performance protocols for female soccer players. Because the effect of sportsmetrics soccer training has not been investigated on the performance and knee valgus during landing in female soccer players, we aimed to investigate this subject. Methods: The current field-trial study was conducted on 24 female soccer players with dynamic knee valgus that were randomly divided into two groups: the training group (TG) and the control group (CG). The assessment tests were the agility t-test, 40-yard test, vertical jump test, double leg squat test, and valgus landing error scoring system test (LESS). The TG group participated in sportsmetrics soccer training regularly for 6 weeks, three 90-min sessions a week. Analysis of covariance was used to analyze the obtained data (P<0.05). Results: Six weeks of sportsmetrics soccer training in the TG group not only reduced dynamic knee valgus during landing (51% reduction, F=171.8, P=0.01) but also improved performance factors significantly: agility (0.50 s reduction, F=23.29, P=0.01), power (2.50 cm increase, F=13.20, P=0.01) and speed (0.30 s reduction, F=23.66, P=0.01). Conclusion: Sportsmetrics soccer training is strongly suggested for soccer players exposed to knee injuries due to dynamic knee valgus during landing.
Asian Journal of Sports Medicine, 2013
Purpose: Excessive knee valgus during landing tasks is a contributing factor to knee injuries. Most studies have examined lower extremity biomechanics during the forward direction of a jump-landing task. Athletes perform many movements in the air and land in multi-directions. Therefore, the purpose of this study was to assess the peak knee valgus angle (PKVA) during one leg jump-landing in various directions. Methods: Eighteen male basketball and volleyball athletes participated in the study. Participants performed one leg jump-landing tests from a 30 cm height platform in four directions. Knee valgus motion was measured using Vicon™ motion system. The data were analyzed with repeated measures ANOVA. Results: Direction significantly (P<0.001) influenced the PKVA during landing. Significantly higher PKVA was observed for the lateral (8.8°±4.7°) direction as compared to forward (5.8°±4.6°) direction (P<0.05). The PKVA in 30° diagonal (7.5°±4.6°) and 60° diagonal (7.7°±5.7°) directions was higher than in the forward direction (P<0.05). Conclusion: One leg jump-landing in lateral and diagonal directions results in a higher PKVA compared to landing in a forward direction and could lead to a higher risk of knee injury.
Journal of Sport Rehabilitation, 2019
Context:Despite the popularity of jump-landing tasks being used to identify injury risk factors, minimal data currently exist examining differences in knee kinematics during commonly used bilateral jumping tasks. This is especially the case for rebounding-based protocols involving young athletes.Objective:The purpose of this study was to compare the frontal plane projection angle (FPPA) during the drop vertical jump (DVJ) and tuck jump assessment (TJA) in a cohort of elite male youth soccer players of varying maturity status.Methods:A total of 57 male youth soccer players from an English championship soccer club participated in the study. Participants performed three trials of the DVJ and TJA, during which movement was recorded with two-dimensional video cameras. FPPA for both right (FPPA-r) and left (FPPA-l) legs, with values <180º indicative of medial knee displacement.Results:On a whole-group level, FPPA-r (172.7 ± 7.4 º versus 177.2 ± 11.7 º; p < 0.05; ES = 0.46) and FPPA-...
Journal of athletic training, 2018
Despite the high frequency of knee injuries in athletes, few researchers have studied the effects of chronologic age and stage of maturation on knee-joint kinematics in male youth soccer players. To use a coach-friendly screening tool to examine knee-valgus scores for players of different ages and at different stages of maturation. Cross-sectional study. Academy soccer clubs. A total of 400 elite male youth soccer players aged 10 to 18 years categorized by chronologic age and stage of maturation based on their years from peak height velocity (PHV). Knee valgus was evaluated during the tuck-jump assessment via 2-dimensional analysis. Frontal-plane projection angles were subjectively classified as minor (<10°), moderate (10°-20°), or severe (>20°), and using these classifications, we scored knee valgus in the tuck jump as 0 ( no valgus), 1 ( minor), 2 ( moderate), or 3 ( severe). A trend toward higher valgus scores was observed in the younger age groups and the pre...
Purpose: To determine gender differences in lower-extremity joint kinematics and kinetics between age-and skill-matched recreational athletes. Methods: Inverse dynamic solutions estimated the lower-extremity flexion-extension and varus-valgus kinematics and kinetics for 15 females and 15 males performing a 60-cm drop landing. A mixed model, repeated measures analysis of variance (gender * joint) was performed on select kinematic and kinetic variables. Results: Peak hip and knee flexion and ankle dorsiflexion angles were greater in females in the sagittal plane (group effect, P Ͻ 0.02). Females exhibited greater frontal plane motion (group * joint, P ϭ 0.02). Differences were attributed to greater peak knee valgus and peak ankle pronation angles (post hoc tests, P ϭ 0.00). Females exhibited a greater range of motion (ROM) in the sagittal plane (group main effect, P ϭ 0.02) and the frontal plane (group * joint, P ϭ 0.01). Differences were attributed to the greater knee varus-valgus ROM, ankle dorsiflexion, and pronation ROM (post hoc tests). Ground reaction forces were different between groups (group * direction, P ϭ 0.05). Females exhibited greater peak vertical and posterior (A/P) force than males (post hoc tests). Females exhibited different knee moment profiles (Group main effect, P ϭ 0.01). These differences were attributed to a reduced varus moment in females (post hoc tests). Conclusion: The majority of the differences in kinematic and kinetic variables between male and female recreational athletes during landing were observed in the frontal plane not in the sagittal plane. Specifically, females generated a smaller internal knee varus moment at the time of peak valgus knee angulation.
Frontiers in Sports and Active Living
ObjectivesFatigue can decrease knee stability and increase the injury risk. However, fatigue is rarely being applied throughout movement analysis. The aim of this study was to investigate if the knee stability throughout SLDLs differ between cyclic and acyclic sports, before and after fatigue in general, and between the dominant and non-dominant leg of soccer players.MethodsA total of 43 active male (n = 34) and female (n = 9) athletes (age: 26.5 ± 7.2) participated in this study with a pre-post-design. Subjects performed a single leg drop landing (SLDL) from a plyobox. For each leg, the two-dimensional frontal plane projection angle (FPPA) was analyzed. After pretesting the shuttle run test was performed until exhaustion, before repeating the measurements.ResultsANOVA with repeated measures was applied and identified no significance difference for the FPPA between cyclic and acyclic sports (F = 0.98, p = 0.33), a significant difference before and after fatigue (F = 12.49, p = 0.002...
2021
Knee and hip muscles play a significant role in orientation of lower extremities during weight-bearing activities. The frontal plane projection angles during single leg landing movements and their relationship with lower extremity muscular strength were investigated in this study. This study followed a cross-sectional study design with 30 male participants of the age of 21.07±1.23 years, heights of 171.70±7.78 cm, weights of 70.74±10.55 kg, and BMIs of 23.89±2.88 kg/m 2. All the participants were university recreational athletes and free from any musculoskeletal injury. Frontal plane projection angles of the knee and hip joint were measured during single leg landing with the help of Vicon three-dimensional movement analysis systems. Muscle strength of knee extension, external rotation of the hip, and abduction of the hip were measured using an isokinetic dynamometer. A significant moderate negative relationship between hip abduction strength with the knee joint angle (r=−0.420, p=0.021) and hip adduction angle (r=−0.458, p=0.011) was found during landing. The hip external rotator strength was negatively correlated with the knee joint angle (r=−0.089, p=0.639) and hip joint angle (r=−0.191, p=0.311) during landing. The knee extensor strength was negative correlated with the knee joint angle (r=−0.057, p=0.765) and hip joint angle (r=−0.085, p=0.653) during landing. This study found a negative significant correlation between hip abductor strength and knee valgus during landing, which means that if the hip adduction angle increases, the knee valgus increases, possibly causing injuries in athletes. The findings of the current study emphasize the need to strengthen the lower extremities to increase hip strength to reduce knee instability during sports activities. This may allow coaches, trainers and clinicians to discover the causes of injury and develop strengthening programmes and neuromuscular control to reduce the risk of injuries.
The Journal of orthopaedic and sports physical therapy, 2015
Study Design Controlled laboratory study; cross-sectional. Objectives To investigate the relationship among anatomical variables, knee laxity, muscle strength, and peak knee valgus angles during a vertical drop jump landing task. Background Excessive knee valgus has been associated with anterior cruciate ligament (ACL) injury in females, however the influence of anatomical characteristics, knee laxity and muscle strength on frontal plane knee motion is not completely understood. Methods Norwegian elite female soccer players (N=209, age: 21 ± 4 years; height: 167 ± 6 cm; body mass: 63 ± 7 kg) were evaluated from 2009 through 2012. The evaluation included three-dimensional (3D) motion analysis of a vertical drop jump, anatomical measures (height, static knee valgus, leg length and static foot posture), knee laxity, and muscle strength (quadriceps, hamstrings and hip abductors). Multiple linear regression analyses were used to investigate the relationships among anatomical characterist...