Validity of a simple videogrammetric method to measure the movement of all hand segments for clinical purposes

摘要

Hand movement measurement is important in clinical, ergonomics and biomechanicalfields. Videogrammetric techniques allow the measurement of hand movement withoutinterfering the natural hand behaviour. However, an accurate measurement of thehand movement requires the use of a high number of markers, which limits itsapplicability for the clinical practice (60 markers would be needed for hand and wrist).In this work, a simple method that uses a reduced number of markers (29), based on asimplified kinematic model of the hand, is proposed and evaluated. A set ofexperiments has been performed to evaluate the errors associated to the kinematicsimplification, together with the evaluation of its accuracy, repeatability andreproducibility. The global error attributed to the kinematic simplification was 6.68º.The method has small errors in repeatability and reproducibility (3.43º and 4.23º,respectively) and shows no statistically significant difference with the use of electronicgoniometers. The relevance of the work lies in the ability of measuring all degrees offreedom of the hand with a reduced number of markers without interfering the naturalhand behaviour, which makes it suitable for its use in clinical applications, as well asfor ergonomic and biomechanical purposes.