Title
Precision, comfort and mechanical performance of the Quadriso-tester, a quadriceps force measuring device
Author
TNO Preventie en Gezondheid
Verkerke, G.J.
Lemmink, K.A.P.M.
Slagers, A.J.
Westhoff, M.H.
van Riet, G.A.J.
Rakhorst, G.
Publication year
2003
Abstract
The mechanical performance, repeatability and comfort of the Quadrisotester, which assesses isometric knee extensor muscle strength, were examined. Twenty healthy subjects and 20 patients treated for unilateral anterior ligamenta cruciata insufficiency were tested. Intra-rater repeatability was determined by the testing and retesting of subjects and calculation of the intra-class correlation coefficient and the mean difference between test and retest values. The comfort level was determined a questionnaire. Measuring time was recorded, and the relationship between knee angle and extension moment was plotted. Strength and stiffness were determined using the finite element method. Intra-rater repeatability was high; the intra-class correlation coefficient of the right and left leg was 0.90 and 0.91, respectively; the coefficient of variation was 6.4 and 6.0%, respectively. The median comfort score of the healthy subjects was 7, and that of the patients was 9. Measuring time remained within 30 min. Misalignment of the knee and sidebar axis disturbed the relationship between knee angle and extension moment. Strength and stiffness were higher than required. In conclusion, the Quadriso-tester is a comfortable and fast device to determine quadriceps force with a high repeatability. The knee and sidebar axis should be well aligned.
Subject
Equipment
Exercise
Isometric
Muscle strenght
Finite element method
Muscle
Patient treatment
Performance
Biomedical engineering
accuracy
calculation
clinical article
controlled study
correlation analysis
device
extensor muscle
finite element analysis
knee cruciate ligament
knee function
measurement
mechanical stimulation
medical assessment
muscle contraction
muscle force
muscle isometric contraction
muscle stiffness
muscle weakness
quadriceps femoris muscle
questionnaire
rating scale
reproducibility
scoring system
time
Adult
Anterior Cruciate Ligament
Biomechanics
Exercise Therapy
Female
Humans
Isometric Contraction
Knee Joint
Ligaments, Articular
Male
Muscle, Skeletal
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http://resolver.tudelft.nl/uuid:ee9960aa-dd64-4f8e-b7f8-93a9fb2d8315
DOI
https://doi.org/10.1007/bf02348432
TNO identifier
237064
ISSN
0140-0118
Source
Medical and Biological Engineering and Computing, 41 (41), 283-289
Document type
article