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Quantification of the segmental kinematics of spontaneous infant movements
Dominik Karch1, Keun-Sun Kim, Katarzyna Wochner
1Institute for Medical Biometry and Informatics, University of Heidelberg, Im Neuenheimer Feld 305, 69120 Heidelberg, Germany. Dominik.Karch@med.uni-heidelberg.de
Insights
This study presents a new electromagnetic tracking method for infant limb movement analysis. It reliably captures kinematics, aiding early diagnosis of motor disorders in infants.
Area of Science:
- Biomechanics
- Pediatric Medicine
- Movement Science
Background:
- Spontaneous infant movement analysis is crucial for early motor dysfunction diagnosis.
- Previous optical tracking methods had limitations in capturing infant limb kinematics.
- Infant anatomy presents unique challenges for motion analysis.
Purpose of the Study:
- To introduce a novel electromagnetic tracking method for infant upper and lower limb movement analysis.
- To enable reliable calculation of segmental kinematics, including relative joint angles.
- To overcome limitations of previous tracking systems in infant motion capture.
Main Methods:
- Utilized an electromagnetic tracking system to record infant limb movements.
- Developed a multi-segmental chain model using calibration movements (hand, foot) to determine joint centers and axes.
- Assessed calibration quality using root mean square deviation and overall accuracy via sensor position/orientation differences.
Main Results:
- Successfully recorded and processed movements of 20 infants (term to 3 months).
- Demonstrated the method's ability to calculate segmental kinematics, including relative angles.
- Illustrated abnormal movement patterns in segmental kinematics through a case application.
Conclusions:
- The presented electromagnetic tracking method is a practical and reliable tool for recording spontaneous infant movements.
- This technique enhances the analysis of infant motor development and aids in early detection of potential issues.
- The ability to calculate relative segment angles offers deeper insights compared to previous methods.
Abstract:
This article introduces a method to capture the movements of the upper and the lower limb of infants using an electromagnetic tracking system and to reliably calculate the segmental kinematics. Analysis of the spontaneous movements of infants is important e.g. in the context of the "General Movement Analysis", which aims at the early diagnosis of motor dysfunctions. Due to special constraints regarding infant anatomy, previous approaches based on optical tracking could only gather position data of the infant' segments, whereas with this method in addition relative segment angles can be calculated. The spontaneous movements of the infant and simple calibration movements of the hand and the foot are used to calculate the joint centers and the joint axes of a multi-segmental chain model. The quality of the calibration movements is assessed at calibration time by calculating the root mean square deviation from the total least squares regression plane. The general accuracy of the recording is evaluated by the difference between recorded and estimated sensor positions and the difference between recorded and estimated sensor orientations. Movements of 20 infants between term and 3 months post term age were recorded and processed. A first application illustrates how abnormal movement patterns are manifested in the segmental kinematics. The results show that the presented method is a practicable and reliable way to record spontaneous infant movements and to calculate the segmental kinematics.
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