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Session: Poster session I
Session starts: Thursday 24 January, 15:00

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Wouter Schallig ()
Josien van den Noort ()
Jennifer McCahill ()
Mario Maas ()
Jaap Harlaar ()
Marjolein van der Krogt ()

Abstract:
Several multi-segment foot models have been developed to measure foot motion during gait1. The Oxford Foot Model2 (OFM) and Rizzoli Foot Model3,4 (RFM) are used most frequently1. The kinematic output of these models has not yet been extensively compared, especially not in atypical gait patterns. Therefore, the aim of this study was to determine the differences in kinematic output between OFM and RFM during normal walking, voluntary equinus and crouch gait. Ten healthy adults (26.8±2.6 years) underwent 3D gait analysis with the Newington marker model5 placed on both lower extremities and a combined OFM and RFM markerset on the right foot2,3,4. After a static trial, subjects walked six times in normal, equinus, and crouch gait. Markers were captured by a 12-camera Vicon system. Three successful trials were time-normalized to 100% of the gait cycle and averaged. Joint angle waveforms and corresponding range of motion (ROM) values were compared between models using repeated measures ANOVAs and post-hoc analyses with Bonferroni correction. For the joint angles these tests were performed with statistical parametric mapping6. Here we describe only sagittal plane results of the hindfoot-shank (HF-SH) and the forefoot-hindfoot (FF-HF) angles. For both angles, an interaction effect between gait pattern and model was present. For HF-SH angle, OFM showed more dorsiflexion compared to RFM during the late stance for normal and crouch gait and consequently a larger ROM. For FF-HF angle, RFM showed more plantar flexion compared to OFM towards the end of stance for all gait patterns as well as a higher ROM. For voluntary equinus gait this difference was most prominent, since it was present from 33-63% of the gait cycle. This study demonstrated relevant differences in kinematic output between OFM and RFM. Interestingly, the differences between the models depend on the gait pattern. It is important to keep this in mind when comparing literature or when applying a specific model to study the gait pattern in a clinical population. The differences between the models are probably a result of different axes definitions and different marker locations with a different sensitivity to skin movement artefacts. 1Leardini&Carvaggi,HandbookOfHumanMotion.2016;1-22 2Stebbins,Gait&Posture.2006;23(4):401-410 3Leardini,Gait&Posture.2007;25(3):453-462 4Portinaro,FootAnkleRes.2014;7(1):1-7 5Davis,HumMovSci.1991;10(5):575-587 6Pataky,Biomechanics.2010;43(10):1976-1982.