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https://www.readbyqxmd.com/read/29679921/electromyographic-and-biomechanical-analysis-of-step-negotiation-in-charcot-marie-tooth-subjects-whose-level-walk-is-not-impaired
#1
Tiziana Lencioni, Giuseppe Piscosquito, Marco Rabuffetti, Enrica Di Sipio, Manuela Diverio, Isabella Moroni, Luca Padua, Emanuela Pagliano, Angelo Schenone, Davide Pareyson, Maurizio Ferrarin
BACKGROUND: Charcot-Marie-Tooth (CMT) is a slowly progressive disease characterized by muscular weakness and wasting with a length-dependent pattern. Mildly affected CMT subjects showed slight alteration of walking compared to healthy subjects (HS). RESEARCH QUESTION: To investigate the biomechanics of step negotiation, a task that requires greater muscle strength and balance control compared to level walking, in CMT subjects without primary locomotor deficits (foot drop and push off deficit) during walking...
April 13, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29679209/quadriceps-tendon-autograft-medial-patellofemoral-ligament-reconstruction
#2
REVIEW
Christian Fink, Robert Steensen, Peter Gföller, Robert Lawton
PURPOSE: Critically evaluate the published literature related to quadriceps tendon (QT) medial patellofemoral ligament (MPFL) reconstruction. RECENT FINDINGS: Hamstring tendon (HT) MPFL reconstruction techniques have been shown to successfully restore patella stability, but complications including patella fracture are reported. Quadriceps tendon (QT) reconstruction techniques with an intact graft pedicle on the patella side have the advantage that patella bone tunnel drilling and fixation are no longer needed, reducing risk of patella fracture...
April 20, 2018: Current Reviews in Musculoskeletal Medicine
https://www.readbyqxmd.com/read/29678420/a-novel-validation-and-calibration-method-for-motion-capture-systems-based-on-micro-triangulation
#3
Gergely Nagymáté, Tamás Tuchband, Rita M Kiss
Motion capture systems are widely used to measure human kinematics. Nevertheless, users must consider system errors when evaluating their results. Most validation techniques for these systems are based on relative distance and displacement measurements. In contrast, our study aimed to analyse the absolute volume accuracy of optical motion capture systems by means of engineering surveying reference measurement of the marker coordinates (uncertainty: 0.75 mm). The method is exemplified on an 18 camera OptiTrack Flex13 motion capture system...
April 12, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29678191/a-biomechanical-analysis-of-triangular-medial-knee-reconstruction
#4
Xiaomeng Wang, Huixin Liu, Guman Duan, Yingzhen Niu, Chang Liu, Fei Wang
BACKGROUND: The purpose of this study was to evaluate and compare knee kinematics and stability following either triangular or anatomical reconstruction of the superficial medial collateral ligament (sMCL) and posterior oblique ligament (POL). METHODS: In a cadaveric model (12 knees), the stability and kinematics following two experimental sMCL and POL reconstructions were compared in sMCL- and POL-deficient knees versus normal knees. The first reconstruction was a triangular reconstruction of the sMCL and POL, while the second involved an anatomical reconstruction of the sMCL and POL...
April 20, 2018: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29677139/musculoskeletal-model-development-of-the-elbow-joint-with-an-experimental-evaluation
#5
Munsur Rahman, Mohsen Sharifi Renani, Akin Cil, Antonis P Stylianou
A dynamic musculoskeletal model of the elbow joint in which muscle, ligament, and articular surface contact forces are predicted concurrently would be an ideal tool for patient-specific preoperative planning, computer-aided surgery, and rehabilitation. Existing musculoskeletal elbow joint models have limited clinical applicability because of idealizing the elbow as a mechanical hinge joint or ignoring important soft tissue (e.g., cartilage) contributions. The purpose of this study was to develop a subject-specific anatomically correct musculoskeletal elbow joint model and evaluate it based on experimental kinematics and muscle electromyography measurements...
April 20, 2018: Bioengineering
https://www.readbyqxmd.com/read/29677101/electromyographic-and-joint-kinematic-patterns-in-runner-s-dystonia
#6
Omar F Ahmad, Pritha Ghosh, Christopher Stanley, Barbara Karp, Mark Hallett, Codrin Lungu, Katharine Alter
Runner’s dystonia (RD) is a task-specific focal dystonia of the lower limbs that occurs when running. In this retrospective case series, we present surface electromyography (EMG) and joint kinematic data from thirteen patients with RD who underwent instrumented gait analysis (IGA) at the Functional and Biomechanics Laboratory at the National Institutes of Health. Four cases of RD are described in greater detail to demonstrate the potential utility of EMG with kinematic studies to identify dystonic muscle groups in RD...
April 20, 2018: Toxins
https://www.readbyqxmd.com/read/29676210/reduced-purposeful-head-movements-during-community-ambulation-following-unilateral-vestibular-loss
#7
Serene Sulyn Paul, Leland E Dibble, Raymond G Walther, Clough Shelton, Richard Klaus Gurgel, Mark Eric Lester
BACKGROUND: Individuals with unilateral vestibular hypofunction (UVH) alter their movement and reduce mobility to try to stabilize their gaze and avoid symptoms of dizziness and vertigo. OBJECTIVE: To determine if individuals with UVH 6 weeks after surgery demonstrate altered head and trunk kinematics during community ambulation. METHODS: A total of 15 vestibular schwannoma patients with documented postoperative unilateral vestibular loss and 9 healthy controls with symmetrical vestibulo-ocular reflexes participated in this cross-sectional study...
April 1, 2018: Neurorehabilitation and Neural Repair
https://www.readbyqxmd.com/read/29675685/laplace-based-modeling-of-fiber-orientation-in-the-tongue
#8
Arnold D Gomez, Nahla Elsaid, Maureen L Stone, Jiachen Zhuo, Jerry L Prince
Mechanical modeling of tongue deformation plays a significant role in the study of breathing, swallowing, and speech production. In the absence of internal joints, fiber orientations determine the direction of sarcomeric contraction and have great influence over real and simulated tissue motion. However, subject-specific experimental observations of fiber distribution are difficult to obtain; thus, models of fiber distribution are generally used in mechanical simulations. This paper describes modeling of fiber distribution using solutions of Laplace equations and compares the effectiveness of this approach against tractography from diffusion tensor magnetic resonance imaging...
April 19, 2018: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/29674337/analysis-of-right-ventricular-myocardial-stiffness-and-relaxation-components-in-children-and-adolescents-with-pulmonary-arterial-hypertension
#9
Yasunobu Hayabuchi, Akemi Ono, Yukako Homma, Shoji Kagami
BACKGROUND: The rate of left ventricular pressure decrease during isovolumic relaxation is traditionally assessed algebraically via 2 empirical indices: the monoexponential and logistic time constants (τE and τL ). Since the pattern of right ventricular (RV) pressure decrease is quite different from that of the left ventricular, we hypothesized that novel kinematic model parameters are more appropriate and useful to evaluate RV diastolic dysfunction. METHODS AND RESULTS: Eight patients with pulmonary arterial hypertension (age 12...
April 19, 2018: Journal of the American Heart Association
https://www.readbyqxmd.com/read/29674309/measuring-risky-driving-behavior-using-an-mhealth-smartphone-app-development-and-evaluation-of-gforce
#10
Raisa Z Freidlin, Amisha D Dave, Benjamin G Espey, Sean T Stanley, Marcial A Garmendia, Randall Pursley, Johnathon P Ehsani, Bruce G Simons-Morton, Thomas J Pohida
BACKGROUND: Naturalistic driving studies, designed to objectively assess driving behavior and outcomes, are conducted by equipping vehicles with dedicated instrumentation (eg, accelerometers, gyroscopes, Global Positioning System, and cameras) that provide continuous recording of acceleration, location, videos, and still images for eventual retrieval and analyses. However, this research is limited by several factors: the cost of equipment installation; management and storage of the large amounts of data collected; and data reduction, coding, and analyses...
April 19, 2018: JMIR MHealth and UHealth
https://www.readbyqxmd.com/read/29673935/investigation-of-the-dependence-of-joint-contact-forces-on-musculotendon-parameters-using-a-codified-workflow-for-image-based-modelling
#11
Luca Modenese, Erica Montefiori, Anqi Wang, Stefan Wesarg, Marco Viceconti, Claudia Mazzà
The generation of subject-specific musculoskeletal models of the lower limb has become a feasible task thanks to improvements in medical imaging technology and musculoskeletal modelling software. Nevertheless, clinical use of these models in paediatric applications is still limited for what concerns the estimation of muscle and joint contact forces. Aiming to improve the current state of the art, a methodology to generate highly personalized subject-specific musculoskeletal models of the lower limb based on magnetic resonance imaging (MRI) scans was codified as a step-by-step procedure and applied to data from eight juvenile individuals...
March 30, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29673397/sex-differences-in-kinematic-adaptations-to-muscle-fatigue-induced-by-repetitive-upper-limb-movements
#12
Jason Bouffard, Chen Yang, Mickael Begon, Julie Côté
BACKGROUND: Muscle fatigue induced by repetitive movements contributes to the development of musculoskeletal disorders. Men and women respond differently to muscle fatigue during isometric single-joint efforts, but sex differences during dynamic multi-joint tasks have not been clearly identified. Moreover, most studies comparing men and women during fatigue development assessed endurance time. However, none evaluated sex differences in kinematic adaptations to fatigue during multi-joint dynamic tasks...
April 19, 2018: Biology of Sex Differences
https://www.readbyqxmd.com/read/29673341/runners-with-patellofemoral-pain-demonstrate-sub-groups-of-pelvic-acceleration-profiles-using-hierarchical-cluster-analysis-an-exploratory-cross-sectional-study
#13
Ricky Watari, Sean T Osis, Angkoon Phinyomark, Reed Ferber
BACKGROUND: Previous studies have suggested that distinct and homogenous sub-groups of gait patterns exist among runners with patellofemoral pain (PFP), based on gait analysis. However, acquisition of 3D kinematic data using optical systems is time consuming and prone to marker placement errors. In contrast, axial segment acceleration data can represent an overall running pattern, being easy to acquire and not influenced by marker placement error. Therefore, the purpose of this study was to determine if pelvic acceleration patterns during running could be used to classify PFP patients into homogeneous sub-groups...
April 19, 2018: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29673204/older-adults-with-weaker-muscle-strength-stand-up-from-a-sitting-position-with-more-dynamic-trunk-use
#14
Rob C van Lummel, Jordi Evers, Martijn Niessen, Peter J Beek, Jaap H van Dieën
The ability to stand up from a sitting position is essential for older adults to live independently. Body-fixed inertial sensors may provide an approach for quantifying the sit-to-stand (STS) in clinical settings. The aim of this study was to determine whether measurements of STS movements using body-fixed sensors yield parameters that are informative regarding changes in STS performance in older adults with reduced muscle strength. In twenty-seven healthy older adults, handgrip strength was assessed as a proxy for overall muscle strength...
April 17, 2018: Sensors
https://www.readbyqxmd.com/read/29671697/a-biomechanical-comparison-of-dominant-and-non-dominant-limbs-during-a-side-step-cutting-task
#15
Christine D Pollard, Marc F Norcross, Sam T Johnson, Amanda E Stone, Eunwook Chang, Mark A Hoffman
Numerous studies have investigated anterior cruciate ligament (ACL) injury risk by examining gender differences in knee and hip biomechanics during a side-step cutting manoeuvre since it is known that ACL injury often occurs during such a task. Recent investigations have also examined lower extremity (LE) biomechanics during side-step cutting in individuals following ACL reconstruction (ACLR). Common research practice is to compare knee and hip biomechanics of the dominant limb between groups but this can add considerable complexity for clinicians and researchers...
April 19, 2018: Sports Biomechanics
https://www.readbyqxmd.com/read/29671383/sport-specific-biomechanical-responses-to-an-acl-injury-prevention-programme-a-randomised-controlled-trial
#16
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 (ClinicalTrials.gov #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
https://www.readbyqxmd.com/read/29671199/automatic-planning-of-needle-placement-for-robot-assisted-percutaneous-procedures
#17
Esia Belbachir, Ehsan Golkar, Bernard Bayle, Caroline Essert
PURPOSE: Percutaneous procedures allow interventional radiologists to perform diagnoses or treatments guided by an imaging device, typically a computed tomography (CT) scanner with a high spatial resolution. To reduce exposure to radiations and improve accuracy, robotic assistance to needle insertion is considered in the case of X-ray guided procedures. We introduce a planning algorithm that computes a needle placement compatible with both the patient's anatomy and the accessibility of the robot within the scanner gantry...
April 18, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29671152/predictive-simulations-of-neuromuscular-coordination-and-joint-contact-loading-in-human-gait
#18
Yi-Chung Lin, Jonathan P Walter, Marcus G Pandy
We implemented direct collocation on a full-body neuromusculoskeletal model to calculate muscle forces, ground reaction forces and knee contact loading simultaneously for one cycle of human gait. A data-tracking collocation problem was solved for walking at the normal speed to establish the practicality of incorporating a 3D model of articular contact and a model of foot-ground interaction explicitly in a dynamic optimization simulation. The data-tracking solution then was used as an initial guess to solve predictive collocation problems, where novel patterns of movement were generated for walking at slow and fast speeds, independent of experimental data...
April 18, 2018: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/29670571/electromyographical-gait-characteristics-in-parkinson-s-disease-effects-of-combined-physical-therapy-and-rhythmic-auditory-stimulation
#19
Christopher A Bailey, Federica Corona, Mauro Murgia, Roberta Pili, Massimiliano Pau, Julie N Côté
Background: In persons with Parkinson's disease (PD), gait dysfunctions are often associated with abnormal neuromuscular function. Physical therapy combined with auditory stimulation has been recently shown to improve motor function and gait kinematic patterns; however, the underlying neuromuscular control patterns leading to this improvement have never been identified. Objectives: (1) Assess the relationships between motor dysfunction and lower limb muscle activity during gait in persons with PD; (2) Quantify the effects of physical therapy with rhythmic auditory stimulation (PT-RAS) on lower limb muscle activity during gait in persons with PD...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/29670152/improvement-of-cerebellar-ataxic-gait-by-injecting-cbln1-into-the-cerebellum-of-cbln1-null-mice
#20
Eri Takeuchi, Aya Ito-Ishida, Michisuke Yuzaki, Dai Yanagihara
Patients and rodents with cerebellar damage display ataxic gaits characterized by impaired coordination of limb movements. Here, gait ataxia in mice with a null mutation of the gene for the cerebellin 1 precursor protein (cbln1-null mice) was investigated by kinematic analysis of hindlimb movements during locomotion. The Cbln1 protein is predominately produced and secreted from cerebellar granule cells. The cerebellum of cbln1-null mice is characterized by an 80% reduction in the number of parallel fiber-Purkinje cell synapses compared with wild-type mice...
April 18, 2018: Scientific Reports
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