1,721,099 research outputs found
A NEW SYNERGY-BASED FOOT MODEL: DESCRIPTION OF ARCHES MOBILITY IN HEALTHY AND FLAT FEET DURING GAIT
No full textBiomechanics of the natural, arthritic, and replaced human ankle joint
No full textThe human ankle joint complex plays a fundamental role in gait and other activities of daily living. At the same time, it is a very complicated anatomical system but the large literature of experimental and modelling studies has not fully described the coupled joint motion, position and orientation of the joint axis of rotation, stress and strain in the ligaments and their role in guiding and stabilizing joint motion, conformity and congruence of the articular surfaces, patterns of contact at the articular surfaces, patterns of rolling and sliding at the joint surfaces, and muscle lever arm lengths. The present review article addresses these issues as described in the literature, reporting the most recent relevant finding
A NOVEL MULTIBODY KINEMATICS OPTIMIZATION APPROACH BASED ON FOOT SYNERGIES TO RECONSTRUCT BONE MOTION OF THE FOOT-ANKLE COMPLEX USING DIFFERENT GAIT PROTOCOLS
No full textThe aim of this work is to exploit the synergies within MKO to track the motion
of all foot bones during a gait cycle. To test the generality and the back-compatibility of the approach, we reconstruct bone motion using the marker sets from different gait protocols, typically used in gait analysis. To compare our results with the literature, we reconstructed the motion also by a MSFM approach
VALIDATION OF AN MRI-BASED PERSONALIZED MODEL OF THE SUBTALAR JOINT
No full textPersonalization of biomechanical models is receiving increasing attention, in the attempt to increase their effectiveness and their clinical impact. Recently, we shown the impact of different personalization strategies of the ankle joint on musculoskeletal model outputs: the higher the personalization the more consistent the model will be to the patient anatomy [1]. In this work we want to validate a model that predict the individual motion of the subtalar joint from an MRI representation of the articular surface. The model, previously validated on the knee [2] and ankle [3], reconstructs the kinematics by optimizing the contact pressure distribution, evaluated by a measure of joint congruence [4]
Gait analysis with a multi-segment foot model for the biomechanical validation of hinged foot-ankle orthoses
No full textHinged Ankle Foot Orthoses (HAFO) are largely prescribed for the treatment of ankle joint deficits, within a variety of neurological and orthopedic disorders. These are intended to control motion of this joint, to compensate for weakness, to correct deformities or to reduce mobility in the sagittal plane only. Quantitative assessment of their functional efficacy is still very limited. The aim of this study is to assess by means of state-of-the-art gait analysis the effect of the position of the mechanical axis of rotation in unlocked HAFO. Unfortunately, in routine custom-made manufacturing, this axis of rotation is positioned exactly mediolaterally, and also a few centimeters above the malleoli, very far from the intermalleolar physiological location.Apossible better axis location for more physiological foot joint rotations was sought by looking at multi-segment foot kinematic
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
AUTOMATICALLY DESIGNED PATIENT-SPECIFIC INSTRUMENTATION FOR TOTAL ANKLE REPLACEMENT: AN IN-VITRO STUDY
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