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Single leg landing

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...
September 12, 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
Joaquín Pérez, Gabriel Adrián Novoa, Andrés Pierobon, Santiago Soliño, Melina Calvo Delfino, Malka Eugenia Sajfar, Candela Carmody, Tomas Vuoto, Javier Hernán Dorado, Sandra Salzberg
INTRODUCTION: The simultaneous rupture of anterior cruciate ligament (ACL) and patellar ligament (PL) is an infrequent condition. Each isolated injury has surgical techniques and rehabilitation protocols that differ widely among each other. Nonetheless, there is no established physical rehabilitation approach when both injuries are associated. OBJECTIVE: The aim of this report is to describe the rehabilitation and the outcomes obtained in the postoperative period of simultaneous rupture of ACL and PL and the follow-up period...
July 29, 2018: Physiotherapy Research International: the Journal for Researchers and Clinicians in Physical Therapy
Adam B Rosen, Jupil Ko, Cathleen N Brown
BACKGROUND: Patellar tendinopathy is a common condition resulting in persistent pain, frequently reported during physical activity. The relationship between dynamic postural stability and pain in these individuals is unclear and how it may affect postural stability. RESEARCH QUESTION: Is there a relationship between acute pain and dynamic postural stability indices in individuals with patellar tendinopathy? METHODS: Twenty-two recreationally active individuals with patellar tendinopathy participated...
September 2018: Gait & Posture
Becky Heinert, Kari Willett, Thomas W Kernozek
Background: Athletes that have had anterior cruciate ligament (ACL) reconstruction are at a greater risk for reinjury. The relationship between ACL reconstruction and the dynamic postural sway index (DPSI) has not yet been examined. Hypothesis/Purpose: The purpose of this study was to examine the DPSI in a surgically reconstructed ACL limb compared to the uninjured leg in athletes that had been cleared for sport. It was hypothesized that in a bilateral limb comparison, the leg that underwent ACL reconstruction would demonstrate poorer postural stability measures (greater DPSI) during a single leg landing activity as compared to the non-surgical limb...
June 2018: International Journal of Sports Physical Therapy
Paul J Read, Jon L Oliver, Gregory D Myer, Mark B A De Ste Croix, Angus Belshaw, Rhodri S Lloyd
OBJECTIVES: Examine the effects of maturation on single leg jumping performance in elite male youth soccer players. DESIGN: Cross sectional. SETTING: Academy soccer clubs. PARTICIPANTS: 347 male youth players classified as either pre, circa or post-peak height velocity (PHV). MAIN OUTCOME MEASURES: Single leg countermovement jump (SLCMJ) height, peak vertical landing forces (pVGRF), knee valgus and trunk side flexion...
September 2018: Physical Therapy in Sport
Gustavo Leporace, Marcio Tannure, Gabriel Zeitoune, Leonardo Metsavaht, Moacir Marocolo, Alex Souto Maior
The aim of this study was to test the correlation between knee-to-hip flexion ratio during a single leg landing task and hip and knee strength, and ankle range of motion. Twenty-four male participants from a professional soccer team performed a continuous single leg jump-landing test during 10s, while lower limb kinematics data were collected using a motion analysis system. After biomechanical testing, maximal isometric hip (abduction, extension, external rotation), knee extension and flexion strength were measured...
July 12, 2018: Sports Biomechanics
Amelie Werkhausen, Kirsten Albracht, Neil J Cronin, Gøran Paulsen, Jens Bojsen-Møller, Olivier R Seynnes
During rapid deceleration of the body, tendons buffer part of the elongation of the muscle-tendon unit (MTU), enabling safe energy dissipation via eccentric muscle contraction. Yet, the influence of changes in tendon stiffness within the physiological range upon these lengthening contractions is unknown. This study aimed to examine the effect of training-induced stiffening of the Achilles tendon on triceps surae muscle-tendon behavior during a landing task. Twenty-one male subjects were assigned to either a 10-week resistance-training program consisting of single-leg isometric plantarflexion ( n = 11) or to a non-training control group ( n = 10)...
2018: Frontiers in Physiology
J Lakshmi R Jayalath, Marcos de Noronha, Nivan Weerakkody, Rodrigo Bini
Fatigue is common during physical activity and can have an effect on ankle biomechanics during different actions, such as a jump. Yet current research on the topic is very heterogeneous and hinders clarity on what changes are actually due to fatigue. Therefore, the aim of this review was to summarise and analyse the current literature that investigates the effects of fatigue on ankle biomechanics during a jump. Searches were conducted in five databases and studies with activities eliciting fatigue and comparing outcomes under a fatigue and non-fatigue conditions were selected...
October 2018: Journal of Electromyography and Kinesiology
Enda King, Chris Richter, Andy Franklyn-Miller, Katherine Daniels, Ross Wadey, Ray Moran, Siobhan Strike
INTRODUCTION: Previous studies examining jump tasks after anterior cruciate ligament reconstruction (ACLR) have focused on performance measures without examining joint kinematic and kinetic variables. The aim of this study was to identify differences in biomechanical and performance measures between limbs across tests 9 months after surgery. METHODS: Four jump tests (double-leg drop jump (DLDJ), single-leg drop jump (SLDJ), single-leg hop for distance (SLHD) and hurdle hop (HH)) were carried out on 156 male subjects in a 3D motion capture laboratory 9 months after surgery...
July 4, 2018: Scandinavian Journal of Medicine & Science in Sports
Emily E Gerstle, Kevin G Keenan, Kristian O'Connor, Stephen C Cobb
During step descent, lower extremity musculature is critical for positioning the foot and ankle for initial contact and stabilizing the structures following contact. Although continuous stair descent has been extensively examined, curb/single transition steps where many injuries occur requires further study. The purpose of this study was to identify the influence of landing strategy and step height on lower extremity muscle activity of uninjured individuals during transition step descent. Twenty-two participants walked along a level walkway, stepped down a single step (heights: 5-cm, 15-cm, 25-cm) landed with the heel or forefoot, and continued walking...
October 2018: Journal of Electromyography and Kinesiology
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