Med Biol Eng Comput - Clinically oriented real-time monitoring of the individual's risk for deep tissue injury.

Tópicos

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Resumo

Spinal cord injury patients are under daily risk for developing deep tissue injury which is a severe pressure ulcer that initiates in soft tissues at the bones' proximity. We aimed to formulate a patient-specific biomechanical model that can continuously monitor internal tissue stresses in real time. We adopted a formulation solving an axisymmetric contact problem of a finite-thickness, elastic layer (soft tissue), and a rigid spherical indentor (ischial tuberosity). We utilized finite element analyses to expand the formulation for large deformations. Sensitivity analyses showed that the soft tissue mechanical properties are the most influential factors in this modeling. We then used synthetic surface pressure data and actual surface pressures recorded under the buttocks of five paraplegic wheelchair users to demonstrate clinical feasibility. Output parameters were designed to be simple so that they can be easily interpreted by the user. Specifically, we calculated peak and average internal von Mises stress and stress dose, under each buttock, and also a time-dependent stress asymmetry index, to account for frequency of posture adjustments. Inter-subject variability was higher than the intra-subject variability. The heaviest subject had the highest maximal and average peak internal soft tissue stress. We believe that this method holds a high potential for clinical applications.

Resumo Limpo

spinal cord injuri patient daili risk develop deep tissu injuri sever pressur ulcer initi soft tissu bone proxim aim formul patientspecif biomechan model can continu monitor intern tissu stress real time adopt formul solv axisymmetr contact problem finitethick elast layer soft tissu rigid spheric indentor ischial tuberos util finit element analys expand formul larg deform sensit analys show soft tissu mechan properti influenti factor model use synthet surfac pressur data actual surfac pressur record buttock five parapleg wheelchair user demonstr clinic feasibl output paramet design simpl can easili interpret user specif calcul peak averag intern von mise stress stress dose buttock also timedepend stress asymmetri index account frequenc postur adjust intersubject variabl higher intrasubject variabl heaviest subject highest maxim averag peak intern soft tissu stress believ method hold high potenti clinic applic

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