Computer-assisted hand-held dynamometer: low-cost instrument for muscle function assessment in rehabilitation medicine |
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Authors: | J Harlaar M E Roebroeck G J Lankhorst |
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Institution: | (1) Department of Rehabilitation Medicine, Free University Hospital, De Boelelaan 1117, 1081 HV Amsterdam, The Netherlands;(2) Netherlands, Institute of Primary Health Care (NIVEL), Utrecht, The Netherlands |
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Abstract: | In rehabilitation medicine, muscle function is assessed during the physical examination of the patient. Although a simple
hand-held instrument improves the assessment of static strength, it is rarely used in clinical practice, where dynamic measurements
are preferred. A computer-assisted hand-held dynamometer (CAHNDY) has been developed that enables the clinician to measure
dynamic muscle function in a standardised manner, using simple (i.e. portable and low-cost) apparatus. The CAHNDY comprises
a force transducer and a movement transducer interfaced to a personal computer. In the study dynamic measurement protocols
are used, based on a biomechanical analysis of daily activities. In this way, iso-functional profiles can be established,
describing the kinematics of muscle function in its functional context. Using the iso-functional profiles as a basis for standardisation,
the double feedback algorithm of the CAHNDY assists the tester in meeting this standard, during maximal muscle function testing.
In a multi-centre trial, the CAHNDY is evaluated by physical therapists for knee extensor and flexor function. The CAHNDY
enables iso-functional dynamic muscle function testing, although application is limited by the maximal strength of the tester.
It is concluded that the CAHNDY is suitable for use in rehabilitation medicine. |
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Keywords: | Biomechanics Dynamometer iso-functional Functional disability Impairment Muscle strength Physical therapy Rehabilitation medicine |
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