Biomaterial Database

A system for the continuous measurement of ankle joint moment in hemiplegic patients wearing ankle-foot orthoses. 1993

S Miyazaki, and S Yamamoto, and M Ebina, and M Iwasaki

Division of Electronic Engineering, Tokyo Medical and Dental University, Japan.

Plastic ankle-foot orthoses (PAFOs) are now commonly used in clinical practice to supplement the gait disabilities of hemiplegic patients. However, few biomechanical investigation have been performed to analyze the corrective functions of PAFOs. In this paper, a measuring system was developed to assess the effect of dorsi/plantar flexibility of a PAFO on patient's gait. First, a mathematical model of gait with a PAFO was established so that the overall ankle joint moment can be separated into the muscle moment and the corrective moment generated by a PAFO. An experimental AFO, which simulates PAFOs, was specially designed and fabricated to continuously measure the corrective moment of the experimental AFO during gait. A device was also developed to continuously measure the overall ankle joint moment, so that the muscle moment can be estimated from the data obtained by the two devices. The measurement accuracy of the device was evaluated using gait data of eight healthy subjects who simulated hemiplegic gait. The range of the mean +/- 1 SD of the errors, calculated for the eight subjects, fell within +/- 5 Nm, which well compares with the error of commonly used comprehensive gait analysis systems.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D008875	Middle Aged	An adult aged 45 - 64 years.	Middle Age
D008954	Models, Biological	Theoretical representations that simulate the behavior or activity of biological processes or diseases. For disease models in living animals, DISEASE MODELS, ANIMAL is available. Biological models include the use of mathematical equations, computers, and other electronic equipment.	Biological Model,Biological Models,Model, Biological,Models, Biologic,Biologic Model,Biologic Models,Model, Biologic
D008991	Monitoring, Physiologic	The continuous measurement of physiological processes, blood pressure, heart rate, renal output, reflexes, respiration, etc., in a patient or experimental animal; includes pharmacologic monitoring, the measurement of administered drugs or their metabolites in the blood, tissues, or urine.	Patient Monitoring,Monitoring, Physiological,Physiologic Monitoring,Monitoring, Patient,Physiological Monitoring
D009989	Orthotic Devices	Apparatus used to support, align, or augment the functioning of parts of the body.	Orthoses,Orthosis,Parapodium,Device, Orthotic,Devices, Orthotic,Orthose,Orthotic Device,Parapodiums
D012016	Reference Values	The range or frequency distribution of a measurement in a population (of organisms, organs or things) that has not been selected for the presence of disease or abnormality.	Normal Range,Normal Values,Reference Ranges,Normal Ranges,Normal Value,Range, Normal,Range, Reference,Ranges, Normal,Ranges, Reference,Reference Range,Reference Value,Value, Normal,Value, Reference,Values, Normal,Values, Reference
D002138	Calibration	Determination, by measurement or comparison with a standard, of the correct value of each scale reading on a meter or other measuring instrument; or determination of the settings of a control device that correspond to particular values of voltage, current, frequency or other output.	Calibrations
D004867	Equipment Design	Methods and patterns of fabricating machines and related hardware.	Design, Equipment,Device Design,Medical Device Design,Design, Medical Device,Designs, Medical Device,Device Design, Medical,Device Designs, Medical,Medical Device Designs,Design, Device,Designs, Device,Designs, Equipment,Device Designs,Equipment Designs
D005260	Female		Females
D005684	Gait	Manner or style of walking.	Gaits