Optokinetic gait analysis with heel orthoses

Optokinetic gait analysis with heel orthoses

e12 Abstracts of the SIAMOC 2008 Congress / Gait & Posture 29S (2009) e1–e31 and the resulting lines. The lines representing the anatomical axes obt...

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e12

Abstracts of the SIAMOC 2008 Congress / Gait & Posture 29S (2009) e1–e31

and the resulting lines. The lines representing the anatomical axes obtained with the cross-correlation were used for angular kinematics determination. References [1] Gage JR, Deluca PA, Renshaw TS. Instr Course Lect 1996;45:491–507. [2] Carson MC, Harrington ME, Thompson N, O’Connor JJ, Theologis TN. J Biomech 2001;34(10):1299–307. [3] Stauffer C, Grimson W.In: IEEE Conference on Computer Vision and Pattern Recognition. 1999. p. 246–52. [4] Rottensteiner F. Proceedings 17th OeAGM Workshop, vol. 68 of Schriftenreihe der OCG; 1993. p. 163–172.

doi: 10.1016/j.gaitpost.2008.10.019

has effects also at knee level with an increase of the flexion in midstance and toe-off (p = 0.0494). The analysis of temporal data (duration heel strike—toe off) did not show a different modality in the loading response compared to the gait without soles, and no statistical significance was found also in a greater engagement of the forefoot even if a tendency to anticipation was observed in both parameters. Discussion: Data did confirm the importance of using these soles in order to protect the tibia-tarsal articolation, but also however the presence of adjustment strategies at knee-joint level in particular during the terminal stance. New issues have arisen concerning the new modalities of muscular work probably caused by the orthoses, not only at tibiatarsal level but also at the knee in order to maintain an effective walk. References

Optokinetic gait analysis with heel orthoses M. Toffano 1,*, S. Mezzarobba 2, A. De Michiel 2, R. Valentini 1, B. Martinelli 1,2 1

Clinical Orthopedic and Traumatologic Unit, University Hospital of Trieste, Trieste, Italy 2 Movement Analysis Lab, Physiotherapy Degree, University of Trieste, Trieste, Italy

[1] Speksnijder CM, vd Munckhof RJH, Moonen S, Walenkamp G. The higher the heel the higher the forefoot-pressure in ten healthy women. Foot 2005;15:17– 21. [2] Gefen A, Megido-Ravid M, Itzchak Y, Arcan M. Analysis of muscular fatigue and foot stability during high-heeled gait. Gait Posture 2002;15:56–63. [3] Ramsay S. The effects of foot orthoses on the ground reaction forces during walking. Part 1. Foot 2001;11(4):205–14.

doi: 10.1016/j.gaitpost.2008.10.020 Introduction: The use of heel orthoses in order to increase the height at the rearcalcanean level, is being proposed in various pathologies of the Achilles tendon, either as a first therapeutic measure or as a conservative treatment. It is known that the use of a heel sole has many different effects on the gait dynamics, however the literature data refer to studies using shoes with a high (> di 5 cm) or moderate (3.8 cm) heel height [1,2]. The purpose of this study is to analyse the quantitative changes in the gait, due to the use of heel soles of minor thickness (2 cm) normally applied in orthopedics. Through the analysis of the force plates curves and the moments at the ankle and knee, we proposed to study the heel strike and the midstance of the gait cycle, indicators that according to literature [3] are significant for a first assessment of the effectiveness of heel soles as a therapeutic measure. Materials and methods: Fourteen healthy subjects without signs of hyperpronation of the subastragalus articulation (BMI between 18.5 and 24.9), age ranging from 20 to 35 years (26.5  5.2) and mean height of 168.4  4.1 cm have been selected. Cinematic data of gait have been obtained by an Optoelectronic Qualisys system with 6 Vicon Pro Reflex Motion Capture cameras (120 Hz) which simultaneously captured 18 passive markers applied to the subject, according to the Skin protocol. Simultaneously the kinetic data have been gathered through two AMTI force plates. The subjects performed several trials of normal walking along a straight track, first without the use of soles and afterwards with 2 cm soles under the heels. The paired sample Wilcoxon test has been used to compare and analyse data to determine statistical significance. Results: From the data analysis it is possible to observe that also soles of minor thickness can significantly modify the gait dynamics. In fact during the gait with soles an extremely significant reduction of the global pattern of the curves has been shown, which expresses the force of the limb in response to the ground reaction forces (p = 0.0001). The presence of the orthoses

Embedding real time intelligence into a wearable monitoring system: A 3-year experience with MagIC P. Meriggi *, F. Rizzo, M. Rabuffetti, M. Ferrarin, M. Di Rienzo Polo Tecnologico – Biomedical Technology Department, Fondazione Don Carlo Gnocchi Onlus, Milano, Italy

Introduction: In 2005 we developed a new textile-based wearable system, named MagIC [1], for the unobtrusive recording of cardiorespiratory and motion signals during spontaneous behavior. Initially our target was to create a compact and comfortable solution for our cardiovascular patients during their rehabilitation activities. From that time, given the reliability and versatility of the system, we have been extended the use of MagIC in a variety of non-clinical areas [2,3]. In this abstract we summarize our recent experience in different fields, including the use of sophisticated real-time algorithms which allow interesting representation of the user’s physical conditions, posture and activity. Methods: The MagIC system is composed of a vest which includes textile sensors for ECG and breathing detection, and a portable electronic board for motion assessment (from a triaxial accelerometer), data storage and wireless transmission to a PDA. The latter can visualize and analyze the acquired signals and possibly re-transmit them via WiFi or GPRS/UMTS to a remote monitoring station. The PDA software also includes an embedded intelligence (EI) module which analyzes the stream of signals originating from the shirt and provides a real time estimation of derived parameters along with their graphical representation in a compact and intuitive form. In particular, the EI module can assess several cardiovascular variables concerning the autonomic control of the heart and also provides an automatic posture classification (APC) and a quantification of the level of activity of the subject.