Analysis of stiffness of the first ray during weightbearing with a new device: a feasibility exploratory study
Rev. Esp. Pod. 2020; 31(1): 24-30 / DOI: 10.20986/revesppod.2020.1555/2019
Sergio Miralles Ruíz, Víctor Mateos Selma, Javier Pascual Huerta
ABSTRACTIntroduction: The mobility of the first ray has generated controversy due to its subjective assessment during exploration of the foot. Historically, this assessment has been done manually for quantification of first ray dorsal excursion being these measurements somewhat subjective.Patients and methods: The present study quantifies the stiffness or first ray dorsiflexion with a new device that measures the vertical displacement of the metatarsal head from 0 to 10 millimeters, in addition to the vertical force, measured in newtons.Results: Thirty-nine feet of 22 asymptomatic were tested in the device. By pooling all data, a stiffness graph was created showing the behaviour of first ray stiffness. The graph showed a lineal behaviour which fitted with theoretical predictions from 0 to 5.3 mm of vertical displacement (44 newtons). From that point, the graph showed an erratic and nonlinear behaviour, probably because of foot adaptations of the patients during the test.Conclusions: Although today there is no single device able of measuring the dorsiflexion resistance of the first ray during standing, the present study tries to perform an exploratory and feasibility analysis with a new device in non-pathological subjects. The study gives interesting data on first ray dorsiflexion stiffness behaviour that could be used in future studies.RESUMENIntroducción: La medición de la movilidad del primer radio ha generado controversia debido a su valoración subjetiva durante la exploración del pie. Esta ha sido históricamente realizada de forma manual y cuantifica la movilidad del primer radio en flexión dorsal, siendo esta medición un tanto subjetiva.Pacientes y métodos: El presente estudio cuantifica la rigidez o resistencia a la dorsiflexión del primer radio con un nuevo dispositivo que mide el desplazamiento vertical de dicha estructura (de 0 a 10 mm), además de la fuerza en newtons, en bipedestación en sujetos sanos.Resultados: Se estudiaron un total de 39 pies de 22 pacientes asintomáticos. Se creó una gráfica de rigidez en flexión dorsal para el primer radio, juntando todos los datos de la muestra. La gráfica ofrecía un comportamiento lineal muy similar a lo esperable teóricamente hasta 5.3 mm de desplazamiento vertical (44 newtons de fuerza). A partir de esta distancia el comportamiento fue más errático y no lineal, posiblemente debido a acomodaciones del pie de los pacientes durante el test.Conclusiones: Aunque a día de hoy no existe un aparato capaz de medir la resistencia a la dorsiflexión del primer radio en bipedestación, el presente estudio trata de realizar un análisis exploratorio con un nuevo dispositivo para cuantificar dicha medición en sujetos no patológicos, aportando datos que pueden resultar interesantes para futuras investigaciones.
ABSTRACT
Introduction: The mobility of the first ray has generated controversy due to its subjective assessment during exploration of the foot. Historically, this assessment has been done manually for quantification of first ray dorsal excursion being these measurements somewhat subjective.Patients and methods: The present study quantifies the stiffness or first ray dorsiflexion with a new device that measures the vertical displacement of the metatarsal head from 0 to 10 millimeters, in addition to the vertical force, measured in newtons.Results: Thirty-nine feet of 22 asymptomatic were tested in the device. By pooling all data, a stiffness graph was created showing the behaviour of first ray stiffness. The graph showed a lineal behaviour which fitted with theoretical predictions from 0 to 5.3 mm of vertical displacement (44 newtons). From that point, the graph showed an erratic and nonlinear behaviour, probably because of foot adaptations of the patients during the test.Conclusions: Although today there is no single device able of measuring the dorsiflexion resistance of the first ray during standing, the present study tries to perform an exploratory and feasibility analysis with a new device in non-pathological subjects. The study gives interesting data on first ray dorsiflexion stiffness behaviour that could be used in future studies.
RESUMEN
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Received: 11/12/2019
Accepted: 21/03/2020
Online First: 13/05/2020
Published: 15/06/2020
Article revision time: 91 days
Article Online First time: 154 days
Article editing time: 187 days