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Single leg landing

Eun Wook Chang, Samuel Johnson, Christine Pollard, Mark Hoffman, Marc Norcross
BACKGROUND: A functional test battery (FTB) has been proposed to determine return to full activity following anterior cruciate ligament reconstruction (ACLR). However, there is little biomechanical evidence of FTB usefulness. The purpose of this study was to compare knee joint landing and cutting biomechanics between ACLR patients who passed (ACLR-Pass), failed (ACLR-Fail), and healthy females (Healthy) before and after exercise. METHODS: Thirty females were included: 10 ACLR-Pass, eight ACLR-Fail and 12 Healthy...
October 25, 2018: Knee
George D Hoffman, Claire Lande, Sujaya Rao
Honey bees (Apis mellifera L. (Hymenoptera: Apidae)) are effective pollinators of many crops but are thought to be inefficient in pollinating blueberries (Vaccinium corymbosum L.) due to their inability to buzz pollinate. Nonetheless, commercial growers rent honey bee hives for pollination, resulting in the dominance of honey bee workers visiting flowers during bloom. The objective of this study was to examine where on the honey bee pollen is carried and how it is transferred from flower to bee to the stigma of other flowers...
November 19, 2018: Environmental Entomology
Marcus J C Lee, David G Lloyd, Brendan S Lay, Paul D Bourke, Jacqueline A Alderson
Increasing knee stability via appropriate muscle activation could reduce anterior cruciate ligament (ACL) injury risk during unplanned sidestepping. High-level athletes may activate their knee muscles differently from low-level athletes when responding to quasi-game realistic versus non game-realistic stimuli. Eleven high-level and 10 low-level soccer players responded to a non game-realistic arrow-planned condition (AP), a quasi game-realistic one-defender scenario (1DS) and two-defender scenario (2DS), and an arrow-unplanned condition (AUNP), that imposed increasing time constraints to sidestep...
November 19, 2018: Journal of Sports Sciences
Kristin D Morgan, Cyril J Donnelly, Jeffrey A Reinbolt
Anterior cruciate ligament (ACL) injuries are common sports injuries, costing the U.S. roughly $1 billion annually. To better understand the underlying injury mechanism, Nyquist and Bode stability criteria were applied to assess frontal plane dynamic knee stability among male Australian Football players during the weight-acceptance phase of single-leg jump landing. Out of 30 landings, 19 were classified as stable and 11 as unstable. Medial and lateral vasti, hamstring and gastrocnemii muscle activation waveforms were analyzed in parallel to determine if individuals with stable and unstable frontal plane joint biomechanics possessed different lower limb neuromuscular strategies...
July 2018: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Duncan P Fransz, Arnold Huurnink, Idsart Kingma, Vosse A de Boode, Ide C Heyligers, Jaap H van Dieën
BACKGROUND: Soccer has a high injury rate, with lateral ankle sprains being a common injury. Therefore, an approach to prevent or at least reduce the occurrence is warranted. Injury prevention can be improved by identifying specific risk factors and individuals at risk. PURPOSE: To assess drop-jump landing performance as a potential predictor of lateral ankle sprain within 3-year follow-up. STUDY DESIGN: Case-control study; Level of evidence, 3...
December 2018: American Journal of Sports Medicine
Jacopo Emanuele Rocchi, Luciana Labanca, Luca Laudani, Carlo Minganti, Pier Paolo Mariani, Andrea Macaluso
OBJECTIVES: It is well known that alterations in landing mechanics persist for years after anterior cruciate ligament reconstruction (ACL-R). Nevertheless, existing literature is controversial in reporting successful or unsuccessful recovery of prelanding muscle activation timing after ACL-R. The study aimed at comparing myoelectric and kinematic patterns during landing tasks between ACL-R and healthy subjects. DESIGN: Cross-sectional study. SETTING: Institutional research laboratory...
October 29, 2018: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
Anna V Lorimer, Justin W L Keogh, Patria A Hume
Background: A review of the literature has indicated that lower body stiffness, defined as the extent to which the lower extremity joints resists deformation upon contact with the ground, may be a useful measure for assessing Achilles injury risk in triathletes. The nature of overuse injuries suggests that a variety of different movement patterns could conceivably contribute to the final injury outcome, any number and combination of which might be observed in a single individual. Measurements which incorporate both kinetics and kinematics (such as stiffness) of a movement may be better able to shed light on individuals at risk of injury, with further analysis then providing the exact mechanism of injury for the individual...
2018: PeerJ
Ana M Azevedo, Raúl Oliveira, João R Vaz, Nelson Cortes
PURPOSE: To compare lower extremity biomechanics between professional dancers (PDs) and non-dancers (NDs) during multidirectional single-leg landings. METHODS: Fifteen PDs (27±7 years, 1.69±0.1m, 57.8±9.3kg), and 15 NDs (25±5 years, 1.69±0.1m, 66±10.2kg) performed single-leg jumps in three directions: 1) lateral, 2) diagonal, and 3) forward. Dominant LE biomechanical data were collected using a motion capture system. Data were processed in Visual3D. LE kinematic (hip, knee and ankle joint angles in sagittal and frontal planes, and range of motion (ROM)) and kinetics (hip and knee internal joint moments and vertical ground reaction force) variables were analyzed at initial contact (IC), peak vertical ground reaction force (PvGRF), and peak knee flexion (PKF)...
October 22, 2018: Medicine and Science in Sports and Exercise
Hunter J Bennett, Kristina Fleenor, Joshua T Weinhandl
Many methodologies exist to predict the hip joint center (HJC), of which regression based on anatomical landmarks appear most common. Despite the fact that predicted HJC locations vary depending upon chosen method, inter-study comparisons and inferences about populations are commonly made. The purpose of this study was to create a normative database of hip and knee biomechanics during walking, running, and single leg landings based on five commonly utilized HJC methods to serve as a reference for inter-study comparisons...
November 16, 2018: Journal of Biomechanics
Brenda Benson Deaver, Tyrel Nelson, Catherine Turner
CONTEXT: Popularity of using handheld devices in clinical settings has increased, especially the use of motion analysis applications (MAA). Video-based measurement tools have been found reliable in measuring knee valgus in subjects without anterior cruciate ligament (ACL) injury. However, there is a need for validation of using a MAA to measure knee valgus in an injured population given that they may exhibit higher degrees of knee valgus. OBJECTIVE: To examine the reliability and validity of using a MAA to measure knee valgus during functional activities used to assess return-to-sport after ACL reconstruction (ACLR)...
October 9, 2018: Journal of Sport Rehabilitation
Komeil Dashti Rostami, Aynollah Naderi, Abbey Thomas
CONTEXT: Hamstring and quadriceps activity adaptations are well known in individuals with anterior cruciate ligament deficiency (ACLD) and reconstructed (ACLR) to potentially compensate for knee joint instability. However, few studies have explored hip muscles activity patterns after ACL injury. OBJECTIVE: to examine the activation characteristics of gluteus medius (GMED) and adductor longus (AL) in ACLR and ACLD subjects compared to controls. DESIGN: case-control study...
October 9, 2018: Journal of Sport Rehabilitation
Luke G Perraton, Ross A Clark, Kay M Crossley, Yong-Hao Pua, Tim S Whitehead, Hayden G Morris, Adam G Culvenor, Adam L Bryant
PURPOSE: Individuals with impaired knee function after anterior cruciate ligament reconstruction (ACLR) may be at greater risk of developing knee osteoarthritis related to abnormal knee joint movement and loading. The aim of this study was to assess the association between knee biomechanics and knee laxity during hopping and clinically assessed knee function (i.e., patient-reported knee function and hop tests) following ACLR. METHODS: Sixty-six participants (23 women, mean age 28 ± 6 years, mean 18 ± 3 months following ACLR) completed a standardized single-leg hopping task...
October 6, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
Komsak Sinsurin, Roongtiwa Vachalathiti, Sarun Srisangboriboon, Jim Richards
Knee joint coordination during jump landing in different directions is an important consideration for injury prevention. The aim of the current study was to investigate knee and hip kinematics on the non-dominant and dominant limbs during landing. A total of 19 female volleyball athletes performed single-leg jump-landing tests in four directions; forward (0°), diagonal (30° and 60°) and lateral (90°) directions. Kinematic and ground reaction force data were collected using a 10-camera Vicon system and an AMTI force plate...
October 2, 2018: Sports Biomechanics
Simone C Gafner, Veronika Hoevel, Ilona M Punt, Stefan Schmid, Stephane Armand, Lara Allet
Diminished hip abductor strength decreases postural control which is a parameter that is associated with an increased risk of ankle sprains. In our study we evaluated the influence of hip abductor fatigue on sagittal plane ankle kinematics and shank muscle activity during a single-leg forward jump. Sagittal ankle plane kinematics are important in ankle sprains but less studied than frontal plane kinematics. Therefore, we evaluated differences in sagittal ankle kinematics (12-camera motion capture system) and lower limb surface electromyographic muscle activity in 20 healthy, recreationally active adults (9 females, 11 males, mean age 30...
December 2018: Journal of Electromyography and Kinesiology
Rachel E Ward, Alycia Fong Yan, Karl F Orishimo, Ian J Kremenic, Marshall Hagins, Marijeanne Liederbach, Claire Hiller, Evangelos Pappas
Repetition of jumps in dance and sport training poses a potential injury risk, however non-contact landing injuries are more common in athletes than dancers. This study aimed to compare the lower limb stiffness characteristics of dancers and athletes during drop landings to investigate possible mechanisms of impact-related injuries. Kinematics and kinetics were recorded as 39 elite modern and ballet dancers (19 men, 20 women) and 40 college level team sport athletes (20 men, 20 women) performed single-legged drop landings from a 30-cm platform...
September 22, 2018: Scandinavian Journal of Medicine & Science in Sports
Enzo Hollville, Antoine Nordez, Gaël Guilhem, Jennyfer Lecompte, Giuseppe Rabita
Animal tendons have been shown to act as shock absorbers to protect muscle fascicles from exercise-induced damage during landing tasks. Meanwhile, the contribution of tendinous tissues to damping activities such as landing has been less explored in humans. The aim of this study was to analyze in vivo fascicle-tendon interactions during drop landing to better understand their role in energy dissipation. Ultrafast ultrasound images of the gastrocnemius medialis (GM) and vastus lateralis (VL), lower limb electromyographic activity, 2-D kinematics, and ground reaction forces were collected from twelve participants during single- and double-leg drop landings from various heights...
September 22, 2018: Scandinavian Journal of Medicine & Science in Sports
Florian Giesche, Tobias Engeroff, Jan Wilke, Daniel Niederer, Lutz Vogt, Winfried Banzer
INTRODUCTION: Current evidence suggests that the loss of mechanoreceptors after anterior cruciate ligament (ACL) tears might be compensated by increased cortical motor planning. This occupation of cerebral resources may limit the potential to quickly adapt movements to unforeseen external stimuli in the athletic environment. To date, studies investigating such neural alterations during movement focused on simple, anticipated tasks with low ecological validity. This trial, therefore, aims to investigate the cortical and biomechanical processes associated with more sport-related and injury-related movements in ACL-reconstructed individuals...
September 19, 2018: BMJ Open
Diego Alves Dos Santos, Bianca Miarka, Fabio Dal Bello, Andreia Cristiane Carrenho Queiroz, Pedro Henrique Berbert de Carvalho, Ciro José Brito, Ralph Beneke
This study verified the performance probabilities by mixed martial arts (MMA) rounds by the same athletes, doing paired comparisons of time-motion and actions before and after 10-years. The sample was composed of 845 UFC rounds of 45 athletes separated in before (M1, age range: 34-44 yrs.) and after (M2, age range: 44-54 yrs.). Motor control (takedowns, submissions, chokes, locks, strike actions to the head, body and leg attempted and landed) and time-motion (high and low intensities; standing and ground times) analysis were done...
August 30, 2018: International Journal of Sports Physiology and Performance
Aaron S Fox, Jason Bonacci, Natalie Saunders
Field-based screening methods have a limited capacity to identify high-risk postures during netball-specific landings associated with anterior cruciate ligament (ACL) injuries. This study determined the biomechanical relationship between a single-leg squat and netball-specific leap landing, to examine the utility of including a single-leg squat within netball-specific ACL injury risk screening. Thirty-two female netballers performed single-leg squat and netball-specific leap landing tasks, during which three-dimensional (3D) kinematic/kinetic data were collected...
August 28, 2018: Sports Biomechanics
Mark T Olsen, Dustin A Bruening, A Wayne Johnson, Sarah T Ridge
PURPOSE: The midfoot is instrumental to foot function; however, quantifying its roles in human movement have been difficult. A forceful dynamic activity like landing may help elucidate the midfoot's contribution to foot energetics and function. The main purpose of this study was to measure midtarsal joint kinematics and kinetics during a barefoot single-leg landing task. A secondary aim of this study was to explore the relationship between static foot posture and dynamic midfoot function...
August 23, 2018: Medicine and Science in Sports and Exercise
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