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https://www.readbyqxmd.com/read/28929926/three-dimensional-kinematic-analysis-and-power-output-of-elite-flat-water-kayakers
#1
Anna Bjerkefors, Olga Tarassova, Johanna S Rosén, Pascal Zakaria, Anton Arndt
The purpose was to examine power output and three-dimensional (3D) kinematic variables in the upper limbs, lower limbs and trunk in elite flat-water kayakers during kayak ergometer paddling. An additional purpose was to analyse possible changes in kinematics with increased intensity and differences between body sides. Six male and four female international level flat-water kayakers participated. Kinematic and kinetic data were collected during three tasks; low (IntL), high (IntH) and maximal (IntM) intensities...
September 20, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28912119/lower-extremity-symmetry-influences-knee-abduction-moments-during-sidestepping-in-rugby
#2
Scott Randall Brown
No abstract text is available yet for this article.
September 14, 2017: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/28884315/is-digital-photography-an-accurate-and-precise-method-for-measuring-range-of-motion-of-the-hip-and-knee
#3
Russell R Russo, Matthew B Burn, Sabir K Ismaily, Brayden J Gerrie, Shuyang Han, Jerry Alexander, Christopher Lenherr, Philip C Noble, Joshua D Harris, Patrick C McCulloch
BACKGROUND: Accurate measurements of knee and hip motion are required for management of musculoskeletal pathology. The purpose of this investigation was to compare three techniques for measuring motion at the hip and knee. The authors hypothesized that digital photography would be equivalent in accuracy and show higher precision compared to the other two techniques. METHODS: Using infrared motion capture analysis as the reference standard, hip flexion/abduction/internal rotation/external rotation and knee flexion/extension were measured using visual estimation, goniometry, and photography on 10 fresh frozen cadavers...
September 7, 2017: Journal of Experimental Orthopaedics
https://www.readbyqxmd.com/read/28878461/comparison-of-physical-activities-of-female-football-players-in-junior-high-school-and-high-school
#4
Yuri Inoue, Yoshitaka Otani, Seiichi Takemasa
[Purpose] This study aimed to compare physical activities between junior high school and high school female football players in order to explain the factors that predispose to a higher incidence of sports injuries in high school female football players. [Subjects and Methods] Twenty-nine female football players participated. Finger floor distance, the center of pressure during single limb stance with eyes open and closed, the 40-m linear sprint time, hip abduction and extension muscle strength and isokinetic knee flexion and extension peak torque were measured...
August 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28878457/effects-of-chronic-ankle-instability-and-induced-mediolateral-muscular-fatigue-of-the-ankle-on-competitive-taekwondo-athletes
#5
Myeounggon Lee, Changhong Youm, Minji Son, Jinhee Kim, Youkyung Kim
[Purpose] The purpose of this study was to investigate the effects of chronic ankle instability and induced mediolateral muscular fatigue of the ankle on competitive Taekwondo athletes during single-leg drop landing. [Subjects and Methods] Fourteen competitive taekwondo athletes with chronic ankle instability and 14 healthy adults participated, and they performed three single-leg drop landings from a 40-cm height before and after induced fatigue. Ankle angular position, peak vertical ground reaction force, loading rate, eccentric work, and contribution were calculated and analyzed...
August 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28866347/wearable-inertial-sensors-allow-for-quantitative-assessment-of-shoulder-and-elbow-kinematics-in-a-cadaveric-knee-arthroscopy-model
#6
Michael Rose, Carolin Curtze, Joseph O'Sullivan, Mahmoud El-Gohary, Dennis Crawford, Darin Friess, Jacqueline M Brady
PURPOSE: To develop a model using wearable inertial sensors to assess the performance of orthopaedic residents while performing a diagnostic knee arthroscopy. METHODS: Fourteen subjects performed a diagnostic arthroscopy on a cadaveric right knee. Participants were divided into novices (5 postgraduate year 3 residents), intermediates (5 postgraduate year 4 residents), and experts (4 faculty) based on experience. Arm movement data were collected by inertial measurement units (Opal sensors) by securing 2 sensors to each upper extremity (dorsal forearm and lateral arm) and 2 sensors to the trunk (sternum and lumbar spine)...
August 30, 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28846613/method-for-estimating-three-dimensional-knee-rotations-using-two-inertial-measurement-units-validation-with-a-coordinate-measurement-machine
#7
Rachel V Vitali, Stephen M Cain, Ryan S McGinnis, Antonia M Zaferiou, Lauro V Ojeda, Steven P Davidson, Noel C Perkins
Three-dimensional rotations across the human knee serve as important markers of knee health and performance in multiple contexts including human mobility, worker safety and health, athletic performance, and warfighter performance. While knee rotations can be estimated using optical motion capture, that method is largely limited to the laboratory and small capture volumes. These limitations may be overcome by deploying wearable inertial measurement units (IMUs). The objective of this study is to present a new IMU-based method for estimating 3D knee rotations and to benchmark the accuracy of the results using an instrumented mechanical linkage...
August 27, 2017: Sensors
https://www.readbyqxmd.com/read/28841670/a-biomechanical-analysis-of-the-roundhouse-kicking-technique-of-expert-practitioners-a-comparison-between-the-martial-arts-disciplines-of-muay-thai-karate-and-taekwondo
#8
Colin J Gavagan, Mark G L Sayers
The purpose of this study was first, to determine whether there were differences in the roundhouse kicking leg kinematics performed by highly skilled Muay Thai, Karate and Taekwondo practitioners (n = 8 per group). Next, analysis aimed to identify the kinematic determinants of effective roundhouse kicking performance. Three-dimensional (3D) lower limb kinematics were recorded using a nine camera infra-red motion capture system (500 Hz) during three maximal roundhouse kicks. Impact forces were recorded using a strain gauge (1000 Hz) attached to a kicking pad positioned at the height of each participant's mastoid process...
2017: PloS One
https://www.readbyqxmd.com/read/28833095/3-d-range-of-motion-envelopes-reveal-interacting-degrees-of-freedom-in-avian-hind-limb-joints
#9
Robert E Kambic, Thomas J Roberts, Stephen M Gatesy
Measuring range of motion (ROM) is a valuable technique that can link bone morphology to joint function in both extant and extinct taxa. ROM results are commonly presented as tables or graphs of maxima and minima for each rotational degree of freedom. We investigate the interactions among three degrees of freedom using X-ray reconstruction of moving morphology (XROMM) to measure ROM of the main hind limb joints of Helmeted Guineafowl (Numida meleagris). By plotting each rotation on an axis, we generate three-dimensional ROM volumes or envelopes composed of hundreds of extreme joint positions for the hip, knee, and intertarsal joints...
August 18, 2017: Journal of Anatomy
https://www.readbyqxmd.com/read/28828066/inferior-results-with-unilateral-compared-with-bilateral-brace-in-ponseti-treated-clubfeet
#10
C Sætersdal, J M Fevang, L B Engesæter
PURPOSE: The Ponseti method for treating clubfoot was introduced in Norway in 2003, and a cohort of children has been followed for 8 to 11 years. In a previous study, we found good results after follow-up of two to five years, with 3% rate of extensive surgery (posterior release or posteromedial release). During 8 to 11 years of follow-up, the rate of extensive surgery increased to 11%. The children had been treated with a bilateral brace or a unilateral brace. In this multicentre study we aimed to compare these two post-corrective treatment methods...
June 1, 2017: Journal of Children's Orthopaedics
https://www.readbyqxmd.com/read/28822721/postural-assessment-in-class-iii-patients-before-orthognathic-surgery
#11
Fernando Zugno Kulczynski, Fernando de Oliveira Andriola, Pedro Henrique Deon, Denizar Alberto da Silva Melo, Rogério Miranda Pagnoncelli
PURPOSE: To determine the postural characteristics of patients with Class III dentofacial deformities before orthognathic surgery by photogrammetry using SAPO postural assessment software. MATERIALS AND METHODS: This was a cross-sectional study. Eligible participants were adult patients who had an indication for orthognathic surgery to correct skeletal Class III dentofacial deformities and were undergoing orthodontic preparation for surgery. Patients were recruited at the outpatient clinic for dentofacial deformities of the authors' institution from March to November 2015...
July 25, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28819599/synovial-chondromatosis-a-rare-differential-diagnosis-of-hip-pain-in-a-child
#12
Manesh Chacko Philip, Sajeer Usman
INTRODUCTION: Primary synovial chondromatosis (SC) is a disease of the synovium occurring in the third to fifth decade of life with the peak incidence in the fifth decade and commonly involves the knee in 50% cases. The diagnosis of SC is primarily radiological and intraoperative. Primary SC of the hip is rare, and their prevalence is not known. CASE REPORT: A 7-year-old female child presented with pain and limp left hip for 6 weeks. She had a stiff hip gait. Clinical examination revealed a fixed abduction, flexion deformity, and restricted internal rotation with apparent lengthening of 2 cm...
March 2017: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/28813859/an-assistive-lower-limb-exoskeleton-for-people-with-neurological-gait-disorders
#13
A Ortlieb, M Bouri, R Baud, H Bleuler
Lower limb exoskeletons have already proven the capability to give back mobility to people suffering from spinal cord injury (SCI). Other important populations such as people with multiple sclerosis or muscular dystrophy, frail elderly and stroke victims, suffer from severe gait impairments and could benefit from similar technology. The work presented in the current paper describes a novel design of a 6-actuated degrees of freedom (DOFs) assistive lower limb exoskeleton for people with moderate mobility impairments...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28806411/cross-sectional-area-of-the-femoral-vein-varies-with-leg-position-and-distance-from-the-inguinal-ligament
#14
Dorota Czyzewska, Andrzej Ustymowicz, Radoslaw Kowalewski, Anna Zurada, Jaroslaw Krejza
PURPOSE: The risk of complications associated with femoral venous catheterization could be potentially reduced if the procedure was performed at the location where the cross-sectional area (CSA) of the vessel is the largest. The diameter of the femoral vein depends on leg position as well as the distance from the inguinal ligament. We determined the CSA of the right femoral vein in three different leg positions at two distances from the inguinal ligament. SUBJECTS AND METHODS: Informed consent was given by 205 healthy volunteers aged 19-39 years, mean: 23±3 years (108 women, 97 men)...
2017: PloS One
https://www.readbyqxmd.com/read/28802221/in-vivo-mechanical-behaviour-of-the-anterior-cruciate-ligament-a-study-of-six-daily-and-high-impact-activities
#15
Elisa Roldán, Neil D Reeves, Glen Cooper, Kirstie Andrews
The anterior cruciate ligament (ACL) plays a key role in the stability of the knee joint restricting the rotation and anterior tibial translation. However, there is a lack of knowledge of the in vivo ACL mechanical behaviour during high impact manoeuvres. The motion of 12 young participants with healthy knees was captured while they performed the following activities: walking, running, cross-over cutting, sidestep cutting, jumping and jumping with one leg. The in vivo ACL length and strain were estimated using experimental kinematic data and three degree of freedom (DOF) knee model...
August 1, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28777695/relationship-of-performance-on-the-sensory-organization-test-to-landing-characteristics
#16
Caleb D Johnson, Valerie J Williams, Nicholas R Heebner, Meleesa F Wohleber, Andrew J Simonson, Deirdre M Rafferty, Andrew Reinert, Timothy C Sell
Jump landing tasks have been used to assess landing characteristics and require significant sensorimotor feedback to maintain functional joint stability (FJS) throughout the task. Postural stability (PS) also requires significant sensorimotor feedback and control and would seemingly involve similar sensory feedback pathways. However, previous literature clarifying the relationship between these two processes, maintaining FJS and PS, is limited. 80 Special Tactics Operators. PS was assessed using the Sensory Organization Test (SOT)...
August 4, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28760559/how-to-measure-responses-of-the-knee-to-lateral-perturbations-during-gait-a-proof-of-principle-for-quantification-of-knee-instability
#17
Josien C van den Noort, Lizeth H Sloot, Sjoerd M Bruijn, Jaap Harlaar
Knee instability is a major problem in patients with anterior cruciate ligament injury or knee osteoarthritis. A valid and clinically meaningful measure for functional knee instability is lacking. The concept of the gait sensitivity norm, the normalized perturbation response of a walking system to external perturbations, could be a sensible way to quantify knee instability. The aim of this study is to explore the feasibility of this concept for measurement of knee responses, using controlled external perturbations during walking in healthy subjects...
July 18, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28759729/the-effects-of-injury-prevention-programs-on-the-biomechanics-of-landing-tasks-a-systematic-review-with-meta-analysis
#18
Thiago Jambo Alves Lopes, Milena Simic, Gregory D Myer, Kevin R Ford, Timothy E Hewett, Evangelos Pappas
BACKGROUND: Anterior cruciate ligament (ACL) tear is a common injury in sports and often occurs during landing from a jump. PURPOSE: To synthesize the evidence on the effects of injury prevention programs (IPPs) on landing biomechanics as they relate to the ligament, quadriceps, trunk, and leg dominance theories associated with ACL injury risk. STUDY DESIGN: Meta-analysis. METHODS: Six electronic databases were searched for studies that investigated the effect of IPPs on landing task biomechanics...
July 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28755495/identification-of-good-candidates-for-valgus-bracing-as-a-treatment-for-medial-knee-osteoarthritis
#19
Allison L Clouthier, Elizabeth A Hassan, Scott C E Brandon, Aaron Campbell, Michael J Rainbow, Kevin J Deluzio
Valgus unloader braces are a conservative treatment option for medial compartment knee osteoarthritis that aim to unload the damaged medial compartment through application of an external abduction moment. Patient response to bracing is highly variable, however. While some experience improvements in pain, function, and joint loading, others receive little to no benefit. The objective of this work was to analyze clinical measures and biomechanical characteristics of unbraced walking to identify variables that are associated with the mechanical effectiveness of valgus unloader bracing...
July 29, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28746383/validation-of-functional-calibration-and-strap-down-joint-drift-correction-for-computing-3d-joint-angles-of-knee-hip-and-trunk-in-alpine-skiing
#20
Benedikt Fasel, Jörg Spörri, Pascal Schütz, Silvio Lorenzetti, Kamiar Aminian
To obtain valid 3D joint angles with inertial sensors careful sensor-to-segment calibration (i.e. functional or anatomical calibration) is required and measured angular velocity at each sensor needs to be integrated to obtain segment and joint orientation (i.e. joint angles). Existing functional and anatomical calibration procedures were optimized for gait analysis and calibration movements were impractical to perform in outdoor settings. Thus, the aims of this study were 1) to propose and validate a set of calibration movements that were optimized for alpine skiing and could be performed outdoors and 2) to validate the 3D joint angles of the knee, hip, and trunk during alpine skiing...
2017: PloS One
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