scholarly journals Landing Biomechanics in Participants With Different Static Lower Extremity Alignment Profiles

2015 ◽  
Vol 50 (5) ◽  
pp. 498-507 ◽  
Author(s):  
Anh-Dung Nguyen ◽  
Sandra J. Shultz ◽  
Randy J. Schmitz
Keyword(s):  
Anterior Cruciate Ligament ◽  
Knee Joint ◽  
Lower Extremity ◽  
Anterior Cruciate Ligament Injury ◽  
Cruciate Ligament ◽  
Ligament Injury ◽  
Valgus Knee ◽  
Drop Jump ◽  
Knee Joint Kinematics ◽  
Anterior Cruciate

Context Whereas static lower extremity alignment (LEA) has been identified as a risk factor for anterior cruciate ligament injury, little is known about its influence on joint motion and moments commonly associated with anterior cruciate ligament injury. Objective To cluster participants according to combinations of LEA variables and compare these clusters in hip- and knee-joint kinematics and kinetics during the landing phase of a drop-jump task. Design Descriptive laboratory study. Setting Research laboratory. Patients or Other Participants A total of 141 participants (50 men: age = 22.2 ± 2.8 years, height = 177.9 ± 9.3 cm, weight = 80.9 ± 13.3 kg; 91 women: age = 21.2 ± 2.6 years, height = 163.9 ± 6.6 cm, weight = 61.1 ± 8.7 kg). Main Outcome Measure(s) Static LEA included pelvic angle, femoral anteversion, quadriceps angle, tibiofemoral angle, genu recurvatum, tibial torsion, and navicular drop. Cluster analysis grouped participants according to their static LEA profiles, and these groups were compared on their hip- and knee-joint kinematics and external moments during the landing phase of a double-legged drop jump. Results Three distinct clusters (C1–C3) were identified based on their static LEAs. Participants in clusters characterized with static internally rotated hip and valgus knee posture (C1) and externally rotated knee and valgus knee posture (C3) alignments demonstrated greater knee-valgus motion and smaller hip-flexion moments than the cluster with more neutral static alignment (C2). Participants in C1 also experienced greater hip internal-rotation and knee external-rotation moments than those in C2 and C3. Conclusions Static LEA clusters that are positioned anatomically with a more rotated and valgus knee posture experienced greater dynamic valgus along with hip and knee moments during landing. Whereas static LEA contributes to differences in hip and knee rotational moments, sex may influence the differences in frontal-plane knee kinematics and sagittal-plane hip moments.

Clinically Assessed Knee Joint Laxity as a Predictor for Reconstruction after an Anterior Cruciate Ligament Injury

2008 ◽  
Vol 36 (8) ◽  
pp. 1528-1533 ◽  
Author(s):  
Ioannis Kostogiannis ◽  
Eva Ageberg ◽  
Paul Neuman ◽  
Leif E. Dahlberg ◽  
Thomas Fridén ◽  
...  
Keyword(s):  
Anterior Cruciate Ligament ◽  
Knee Joint ◽  
Anterior Cruciate Ligament Injury ◽  
Cruciate Ligament ◽  
Joint Laxity ◽  
Ligament Injury ◽  
Knee Joint Laxity ◽  
Anterior Cruciate

scholarly journals Effect of Sand on Landing Knee Valgus During Single-Leg Land and Drop Jump Tasks: Possible Implications for ACL Injury Prevention and Rehabilitation

2021 ◽  
Vol 30 (1) ◽  
pp. 97-104
Author(s):  
Mark C. Richardson ◽  
Andrew Wilkinson ◽  
Paul Chesterton ◽  
William Evans
Keyword(s):  
Anterior Cruciate Ligament ◽  
Injury Prevention ◽  
Anterior Cruciate Ligament Injury ◽  
Cruciate Ligament ◽  
Ligament Injury ◽  
Knee Valgus ◽  
Drop Jump ◽  
Jump Training ◽  
Males And Females ◽  
Anterior Cruciate

Context: Despite significant emphasis on anterior cruciate ligament injury prevention, injury rates continue to rise and reinjury is common. Interventions to reduce injury have included resistance, balance, and jump training elements. The use of sand-based jump training has been postulated as an effective treatment. However, evidence on landing mechanics is limited. Objective: To determine potential differences in landing strategies and subsequent landing knee valgus when performing single-leg landing (SLL) and drop jump (DJ) tasks onto sand and land, and to compare between both male and female populations. Design: A randomized repeated-measures crossover design. Setting: University laboratory. Participants: Thirty-one participants (20 males and 11 females) from a university population. Interventions: All participants completed DJ and SLL tasks on both sand and land surfaces. Main Outcome Measures: Two-dimensional frontal plane projection angle (FPPA) of knee valgus was measured in both the DJ and SLL tasks (right and left) for both sand and land conditions. Results: FPPA was lower (moderate to large effect) for SLL in sand compared with land in both legs (left: 4.3° [2.8°]; right: 4.1° [3.8°]) for females. However, effects were unclear (left: −0.7° [2.2°]) and trivial for males (right: −1.1° [1.9°]). FPPA differences for males and females performing DJ were unclear; thus, more data is required. Differences in FPPA (land vs sand) with respect to grouping (sex) for both SLL left (4.9° [3.0°]) and right (5.1° [4.0°]) were very likely higher (small)/possibly moderate for females compared with males. Conclusions: The effects of sand on FPPA during DJ tasks in males and females are unclear, and further data is required. However, the moderate to large reductions in FPPA in females during SLL tasks suggest that sand may provide a safer alternative to firm ground for female athletes in anterior cruciate ligament injury prevention and rehabilitation programs, which involve a SLL component.

Sign in / Sign up

Export Citation Format

Share Document