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REference FRame Alignment MEthod
Kinematic analysis involves calculating signals from optical or inertial datapoints to represent the relative movement of joint segments.
The exact choice of local segment frame orientation and position in a bone segment has been shown to drastically influence the shape and magnitude of the associated kinematic signals, making the consistent interpretation of the underlying joint motion a challenge. Despite ISB recommendations aiming to standardise the reporting of these signals, a lack of consensus around joint coordinate frame definitions remains. An approach capable of accommodating different analytical methods and ultimately reconciling these differences in frame alignment, while ensuring consistent interpretations, is therefore crucial.
Here, we present REFRAME (REference FRame Alignment MEthod), an approach to minimise cross-talk between axes of a movement, and thereby provide kinematic patterns that can be reliably compared without requiring direct knowledge of the relative poses of the different segment frames. In this manner, REFRAME can enable the consistent interpretation and comparison of joint kinematics derived using different approaches.
End user license agreement (PDF download, 115.2 KB)Comparison of markerless and marker-based motion analysis accounting for differences in local reference frame orientation
Camilla Antognini, Ariana Ortigas-Vásquez,Christopher Knowlton, Michael Utz, Adrian Sauer, Markus A. Wimmer
Comparison of IMU-Based Knee Kinematics with and without Harness Fixation against an Optical Marker-Based System
Jana G. Weber, Ariana Ortigas-Vásquez, Adrian Sauer, Ingrid Dupraz, Michael Utz, Allan Maas, Thomas M. Grupp
Validation of Inertial-Measurement-Unit-Based Ex Vivo Knee Kinematics during a Loaded Squat before and after Reference-Frame-Orientation Optimisation
Svenja Sagasser, Adrian Sauer, Christoph Thorwächter, Jana G. Weber, Allan Maas, Matthias Woiczinski, Thomas M. Grupp, Ariana Ortigas-Vásquez
Assessing the implementation of the REference FRame Alignment MEthod to compare differences in tibio-femoral kinematics during gait using five different marker sets
Ariana Ortigas-Vásquez, Ann-Kathrin Einfeldt, Yasmin Haufe, Michael Utz, Eike Jakubowitz, Adrian Sauer
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Conceptual foundations of a REFRAME-based approach to discriminate across total knee implant designs based on the positions of functional centres of rotation
Adrian Sauer, Ariana Ortigas-Vásquez, Christoph Thorwaechter, Peter E. Müller, Henning Windhagen, Allan Maas, Thomas M. Grupp, William R. Taylor, Matthias Woiczinski
A reproducible representation of healthy tibiofemoral kinematics during stair descent using REFRAME – part I: REFRAME foundations and Validation
Ariana Ortigas-Vásquez, William R. Taylor, Barbara Postolka, Pascal Schütz, Allan Maas, Matthias Woiczinski, Thomas M. Grupp & Adrian Sauer
A reproducible representation of healthy tibiofemoral kinematics during stair descent using REFRAME – Part II: Exploring optimisation criteria and inter-subject differences
Ariana Ortigas-Vásquez, William R. Taylor, Barbara Postolka, Pascal Schütz, Allan Maas, Thomas M. Grupp, Adrian Sauer
A frame orientation optimisation method for consistent interpretation of kinematic signals
Ortigas Vásquez A, Taylor WR, Maas A, Woiczinski M, Grupp TM, Sauer A. Sci Rep. 2023 Jun 14;13(1):9632. doi: 10.1038/s41598-023-36625-z.
A framework for analytical validation of inertial-sensor-based knee kinematics using a six-degrees-of-freedom joint simulator
Ortigas Vásquez A, Maas A, List R, Schütz P, Taylor WR, Grupp TM. Sensors (Basel). 2022 Dec 29;23(1):348. doi: 10.3390/s23010348.
Interpretation of natural tibio-femoral kinematics critically depends upon the kinematic analysis approach: A survey and comparison of methodologies
Postolka B, Taylor WR, Dätwyler K, Heller MO, List R, Schütz P. J Biomech. 2022 Nov;144:111306. doi: 10.1016/j.jbiomech.2022.111306.
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