Model to estimate hamstrings behavior in cerebral palsy patients: As a pre-surgical clinical diagnosis tool

Ravera, Emiliano Pablo; Crespo, Marcos; Catalfamo, Paola; Braidot, Ariel

doi:10.1109/iembs.2010.5626554

Cited by 4 publications

(5 citation statements)

References 23 publications

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“…Las posiciones del origen e inserción de los músculos son estimados como desplazamientos ponderados por el ancho de la cadera, muslo o rodilla según corresponda, en sistemas de referencias locales que siguen el movimiento de los segmentos correspondiente [16].…”

Section: Métodosunclassified

“…El problema de optimización es realiza mediante la resolución con fmincon de la librería de optimización de MatLab [18]. Los valores de momentos articulares netos se obtienen mediante el modelo de segmentos articulados en 3D del miembro inferior [16] a partir del registro con un sistema Elite de BTS y dos plataformas de Fuerzas de un individuo con patrones de marcha normal.…”

Section: Máx I Funclassified

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Modelo Músculo-esquelético para Obtener Fuerzas Musculares Individuales

Ravera

Catalfamo

Crespo

et al. 2013

V Latin American Congress on Biomedical Engineering CLAIB 2011 May 16-21, 2011, Habana, Cuba

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Abstract-Mechanical simulat ions of the mu sculoskeletal system ar e a topic of fundame ntal impor tance be cause the y provide infor mation not immediate ly identified fr om a kinematic-dynamic analysis of gait or muscle static te st, to be relevant for treatment of patients with motor disorders. The causes an d ap propriate corrective treatment of ga it ab normalities are difficult to determine because the movements generated by the muscular f orces o f these patients are not clearly understood. Mathem atical optimiz ation methods are used to estimate individual forc es in the human body be cause dir ect measurements are difficult to make. The ass umption that the central nervous system tries to minimize the load on the muscles in general leads to the hypothesis that muscle strength can be found as the solution to optimization problem. In this paper a mechanical system with six degrees of freedom to model the musculoskeletal system of the t high that allo ws the estimatio n of six individual muscle forces in gait showing high correlation with othe r mode ls and musc le ac tivation in healthy subject s. These es timates of in dividual mu scle for ces would faci litate greater unde rstanding of gait pathology he lping to r each be tter diagnosis prior to surgery and rehabilitation treatments. Palabras claves-Simulac ión Músculo-Esquelética, M odelo de Optimización, Biomecánica de la Marcha I. INTRODUCCIÓNEl manejo de las anormalidades de la marcha comúnmen-te presentes en personas con CP representa un gran desafío en la actualidad. Cirugías músculo-esqueléticas y otros tratamientos ortopédicos son comúnmente prescriptos en un esfuerzo por mejorar la alineación de los miembros del paciente y aumentar la habilidad de caminar [1] [2].Las simulaciones mecánicas del sistema músculo-esquelético son un tema de fundamental importancia en investigación así como también en prácticas de ingeniería y aplicaciones médicas [3]. Estos modelos proveen información que no se identifica inmediatamente desde un análisis cinemático-dinámico de la marcha o tests musculares estáti-cos, siendo relevantes para un correcto tratamiento de estos pacientes [4].Idealmente, las recomendaciones para una cirugía ortopédica podrían estar basadas en una descripción cuantitativa de cómo se alterarán probablemente las propiedades musculares de generación de fuerza, y como influenciarán la marcha de los pacientes [5].Las causas y el apropiado tratamiento correctivo de las anomalías de la marcha son difíciles de determinar porque los movimientos generados por las fuerzas musculares de estos pacientes no son comprendidos con claridad [6] [7]. De esta forma, la identificación expresa de la anomalía no presenta una solución directa [8].Mejoras del tratamiento de movimientos anormales presentan un gran desafío en la actualidad dado que no existen bases teóricas para determinar las causas biomecánicas de la marcha anormal de estos pacientes [9][10] [11].Así, una correcta determinación de la etiología de los patrones anormales de la marcha es la clave para ...

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Section: Métodosunclassified

Section: Máx I Funclassified

Modelo Músculo-esquelético para Obtener Fuerzas Musculares Individuales

Ravera

Catalfamo

Crespo

et al. 2013

V Latin American Congress on Biomedical Engineering CLAIB 2011 May 16-21, 2011, Habana, Cuba

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“…The potential factors predisposing to VF, including muscle force and range of joints' motion, have been simulated based on inverse dynamics. For instance, the high muscle force prevented the foot arch to collapse (Alessandra et al, 2009), and the length of hamstrings affected crouch gait (Ravera et al, 2010). Compared with the joint moments in several degrees of freedom, biased muscle attachment points in CP children did not change (Hainisch et al, 2012).…”

Section: Introductionmentioning

confidence: 96%

Biomechanical behavior of valgus foot in children with cerebral palsy: A comparative study

Guo

Wang

et al. 2015

Journal of Biomechanics

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“…At this point, the potential and necessity of using correct biomechanical models that consistently study the abnormalities become clear. Reinforcing and correcting a simp le gait analysis and eliminating the unknowns when selecting the appropriate treatment are crucial in clinical settings [23].…”

Section: Introductionmentioning

confidence: 99%

Electromyography as an Important Parameter for a Proper Assessment of Dynamic Muscles Strength in Gait Analysis

Ravera¹,

Catalfamo²,

Crespo³

et al. 2013

AJBE

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Normal gait is a functional movement involving the most efficient energy transfer. Cerebral Palsy describes a group of developmental d isorders of movement and posture causing activity restriction or d isability. It represents one of the most common cause of physical disability in ch ildren. Gait analysis provides great contributions to the understanding of gait disorders originating fro m musculoskeletal abnormalit ies. In these patients provides a mean for a mo re co mprehensive treatment plan. At this point, the potential and necessity of using correct biomechanical models that consistently study the abnormalities beco me clear. Reinforcing and correcting a simp le gait analysis and eliminating the unknowns when selecting the appropriate treatment are crucial in clin ical settings. In this paper a musculoskeletal th igh model with a simple rescaling method using subject-specific anthropometric data is presented. The thigh model estimates muscle forces of the six muscles through the walking based in static optimization without including electromyography data as input. We used the model proposed for identify the muscles strength involved in normal and pathological gait. The forces obtaining for normal subjects achieved high concordance with their electro myography data and outcomes to other musculoskeletal model recently presented. In other hand, in patients with cerebral palsy with crouch gait the outcomes of our musculoskeletal model don't show a correct concordance with their electro myography data. For this reason we get on the conclusion that take electro myography data became important in modeling a pathological gait as crouch gait.

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Model to estimate hamstrings behavior in cerebral palsy patients: As a pre-surgical clinical diagnosis tool

Cited by 4 publications

References 23 publications

Modelo Músculo-esquelético para Obtener Fuerzas Musculares Individuales

Modelo Músculo-esquelético para Obtener Fuerzas Musculares Individuales

Biomechanical behavior of valgus foot in children with cerebral palsy: A comparative study

Electromyography as an Important Parameter for a Proper Assessment of Dynamic Muscles Strength in Gait Analysis

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