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Single leg landing

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...
July 24, 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...
July 7, 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...
June 21, 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 nine 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 nine 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...
June 18, 2018: Journal of Electromyography and Kinesiology
Peta T Johnston, Jodie A McClelland, Kate E Webster
BACKGROUND: Anterior cruciate ligament reconstruction (ACLR) may not restore lower limb biomechanics during single-limb landings. OBJECTIVES: Our objective was to identify and evaluate differences in lower limb biomechanics during high-demand single-limb landings between the ACLR limb and the contralateral limb and healthy control participants. METHODS: A systematic review of the literature was conducted using six electronic databases searched until April 2017 for published peer-reviewed studies that investigated lower limb biomechanics on the ACLR limb compared with either the contralateral limb or those of control participants...
June 12, 2018: Sports Medicine
Chamnan Chinnasee, Gillian Weir, Siriporn Sasimontonkul, Jacqueline Alderson, Cyril Donnelly
Unplanned sidestepping and single-leg landing have both been used to screen athletes for injury risk in sport. The aim of this study was to directly compare the lower limb mechanics of three single-leg landing tasks and an unplanned sidestepping task. Thirteen elite female team sport athletes completed a series of non-contact single-leg drop landings, single-leg countermovement jumps, single-leg jump landings and unplanned sidestepping in a randomized counterbalanced design. Three dimensional kinematics (250 Hz) and ground reaction force (2,000 Hz) data with a participant specific lower limb skeletal model were used to calculate and compare hip, knee and ankle joint kinematics, peak joint moments, instantaneous joint power and joint work during the weight acceptance phase of each sporting task (α=0...
July 2018: International Journal of Sports Medicine
Thiago Jambo Alves Lopes, Deisi Ferrari, Joshua Ioannidis, Milena Simic, Fábio Mícolis de Azevedo, Evangelos Pappas
Study Design Systematic review with meta-analysis. Background Two-dimensional (2D) analysis is commonly used to quantify frontal plane kinematics of the trunk and lower extremity; however, there are conflicting results regarding the reliability and validity of these measurements. Objective To synthesize the current literature to determine if 2D analysis is a reliable and valid method of measuring frontal plane kinematics of the trunk and lower extremity during squatting, landing and cutting tasks. Methods MEDLINE, CINAHL, EMBASE, Scopus and SportDISCUS databases were searched from inception until March 2017...
June 12, 2018: Journal of Orthopaedic and Sports Physical Therapy
Jack Dix, Stephanie Marsh, Bart Dingenen, Peter Malliaras
OBJECTIVE: To systematically review literature investigating the relationship between hip muscle strength and dynamic lower extremity valgus during movement tasks in asymptomatic females. METHODS: Four databases (CINAHL, SPORTDiscus, Embase and Ovid MEDLINE) were searched in February 2017. Studies investigating the relationship between hip muscle strength and dynamic knee or lower extremity valgus during movement tasks among asymptomatic females over 18 years old were included...
May 25, 2018: Physical Therapy in Sport
Jatin P Ambegaonkar, Shane V Caswell, Nelson Cortes
Dancers, similar to other athletes, often perform vertical and horizontal jumps. Lower extremity (LE) work, power, and balance are important in performing these movements. However, whether these qualities are inter-related in dancers remains unclear. Our purposes were to examine if 1. LE horizontal work, vertical power, and balance were inter-related, and 2. LE horizontal work and vertical power would predict balance in female collegiate dancers. Sixty-one collegiate female dancers (18.3 ± 0.7 years; 164.7 ± 7...
June 15, 2018: Journal of Dance Medicine & Science
Jordan C Troester, Jason G Jasmin, Rob Duffield
The present study examined the inter-trial (within test) and inter-test (between test) reliability of single-leg balance and single-leg landing measures performed on a force plate in professional rugby union players using commercially available software (SpartaMARS, Menlo Park, USA). Twenty-four players undertook test - re-test measures on two occasions (7 days apart) on the first training day of two respective pre-season weeks following 48h rest and similar weekly training loads. Two 20s single-leg balance trials were performed on a force plate with eyes closed...
June 2018: Journal of Sports Science & Medicine
Mark C Richardson, Sinead Murphy, Tom Macpherson, Bryan English, Iain Spears, Paul Chesterton
Richardson, MC, Murphy, S, Macpherson, T, English, B, Spears, I, and Chesterton, P. Effect of sand on knee load during a single-leg jump task: implications for injury prevention and rehabilitation programs. J Strength Cond Res XX(X): 000-000, 2018-The purpose of the study was to determine potential differences in landing strategies and subsequent joint loads at the knee (knee abduction moment [KAM], anterior-posterior [AP] tibial translation, and total knee shear force) when jumping onto sand and firm ground from both a level surface and a 30-cm height...
May 7, 2018: Journal of Strength and Conditioning Research
Shogo Sasaki, Yasuharu Nagano, Hiroshi Ichikawa
Anterior cruciate ligament (ACL) injuries in badminton commonly occur during single-leg landing after an overhead stroke in the backhand-side court. This study compared differences in trunk acceleration and kinematic variables during single-leg landing in the forehand- and backhand-side courts after an overhead stroke. Eighteen female junior badminton players performed two singles games while wearing a tri-axial accelerometer. The moment that over 4g of resultant acceleration was generated was determined using synchronised video cameras...
May 10, 2018: Journal of Sports Sciences
Shun Kunugi, Akihiko Masunari, Naruto Yoshida, Shumpei Miyakawa
OBJECTIVE: The purpose of this study was to investigate the association between Cumberland Ankle Instability Tool (CAIT) scores and postural stability during a diagonal landing, and to investigate whether postural stability is altered in collegiate soccer players with and without functional ankle instability (FAI). DESIGN: Cross-sectional study. SETTING: Laboratory. PARTICIPANTS: Ninety-one soccer players were classified into a FAI group (history of at least two ankle sprains and a CAIT-Japanese version score ≤25, n = 28), a copers group (history of one ankle sprain and a CAIT-Japanese version score ≥26, n = 32), or a control group (no history of ankle sprain, n = 31)...
July 2018: Physical Therapy in Sport
Jeffrey B Taylor, Kevin R Ford, Randy J Schmitz, Scott E Ross, Terry A Ackerman, Sandra J Shultz
Anterior cruciate ligament (ACL) injury prevention programmes have not been as successful at reducing injury rates in women's basketball as in soccer. This randomised controlled trial ( #NCT02530333) compared biomechanical adaptations in basketball and soccer players during jump-landing activities after an ACL injury prevention programme. Eighty-seven athletes were cluster randomised into intervention (6-week programme) and control groups. Three-dimensional biomechanical analyses of drop vertical jump (DVJ), double- (SAG-DL) and single-leg (SAG-SL) sagittal, and double- (FRONT-DL) and single-leg (FRONT-SL) frontal plane jump landing tasks were tested before and after the intervention...
April 19, 2018: Journal of Sports Sciences
Antonio Dello Iacono, Moshe Ayalon, Weijie Wang
BACKGROUND: The purpose of this study was to investigate whether different directions of single-leg landing tasks would influence lower limbs joints biomechanics. METHODS: Using a controlled and experimental design, thirty physically active male subjects (age: 26.4 ± 4.4 years; height: 180.5 ± 3.7 cm; weight: 79.8: ± 4.4 kg), by dropping down from the top of a wooden box of 31 cm height, performed three one-leg landing tasks featured by different landing directions: frontward (FL), lateral (LL), and rotational (RL)...
April 4, 2018: Journal of Sports Medicine and Physical Fitness
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