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Altered loading during walking and sit-to-stand is affected by quadriceps weakness after total knee arthroplasty.
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Altered loading during walking and sit-to-stand is affected by quadriceps weakness after total knee arthroplasty.

Autor: RL Mizner Afiliación: Department of Physical Therapy, University of Delaware, Newark, DE 19716, USA.; L Snyder-Mackler
Edición/Formato: Artículo Artículo : Inglés (eng)
Publicación:Journal of orthopaedic research : official publication of the Orthopaedic Research Society, 2005 Sep; 23(5): 1083-90
Base de datos:De MEDLINE®/PubMed®, una base de datos de la Biblioteca Nacional de Medicina de los Estados Unidos.
Otras bases de datos: ArticleFirstBritish Library Serials
Resumen:
PURPOSE: Total knee arthroplasty (TKA) successfully reduces pain, but has not achieved comparable improvements in function. We hypothesized that quadriceps strength affects performance by altering loading and movement patterns during functional tasks. METHODS: Fourteen subjects with isolated, unilateral TKA were tested three months after surgery. Quadriceps strength was assessed isometrically and kinematics,  Leer más
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Detalles

Tipo de documento: Artículo
Todos autores / colaboradores: RL Mizner Afiliación: Department of Physical Therapy, University of Delaware, Newark, DE 19716, USA.; L Snyder-Mackler
ISSN:0736-0266
Nota del idioma: English
Identificador único: 111672806
Premios:

Resumen:

PURPOSE: Total knee arthroplasty (TKA) successfully reduces pain, but has not achieved comparable improvements in function. We hypothesized that quadriceps strength affects performance by altering loading and movement patterns during functional tasks. METHODS: Fourteen subjects with isolated, unilateral TKA were tested three months after surgery. Quadriceps strength was assessed isometrically and kinematics, kinetics, and EMG were collected during level walking and sit-to-stand (STS). Function was assessed using the timed up and go test (TUG), stair climbing test (SCT), and the 6 min walk test (6MW). RESULTS: Functional performance was significantly related to the quadriceps strength of both legs, but was more strongly related to the uninvolved strength (involved rho=-0.43 with TUG; -0.65 with SCT; 0.64 with 6MW) (uninvolved rho=-0.63 with TUG; -0.68 with SCT; 0.77 with 6MW). During STS, subjects shifted weight away from the operated limb (p<0.01). Quadriceps muscle activity and the extension moments at the knee and hip were smaller in the involved compared to the uninvolved (p<0.05). The amount of asymmetry in knee excursion during weight acceptance in gait, the asymmetry in weight bearing from sit-to-stand, and the uninvolved hip extension moment during STS were related to the amount of asymmetry in quadriceps strength (rho>0.56, p<0.05). CONCLUSIONS: Quadriceps weakness in patients with TKA has a substantial impact on the movement patterns and performance of the knee during functionally important tasks.

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Datos enlazados


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