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James R. Gage

Bio: James R. Gage is an academic researcher from University of Minnesota. The author has contributed to research in topics: Cerebral palsy & Gait analysis. The author has an hindex of 32, co-authored 49 publications receiving 7591 citations. Previous affiliations of James R. Gage include Boston Children's Hospital & University of Connecticut.

Papers
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Journal ArticleDOI
TL;DR: The gait analysis laboratory provides quantified assessments of human locomotion which assist in the orthopaedic management of various pediatric gait pathologies by utilizing a video-based data collection strategy similar to commercially available systems for motion data collection.

2,684 citations

Journal ArticleDOI
TL;DR: A method is derived to calculate the amount by which a subject's gait deviates from an average normal profile, and to represent this deviation as a single number; it is found that using this index, increasing clinical involvement corresponds to increasing index score.

388 citations

01 Jan 1991
TL;DR: A recent advance in the study of walking patterns has been the development of the gait laboratory, where the use of a videotape, EMG and force plates allows the study the origins of a child's abnormal gait.
Abstract: A recent advance in the study of walking patterns has been the development of the gait laboratory, where the use of a videotape, EMG and force plates allows the study of the origins of a child's abnormal gait This book describes the use of gait analysis in the treatment of cerebral palsy

372 citations

Journal ArticleDOI
TL;DR: In this article, a brief overview of the nature and role of gait analysis in the treatment of Gait problems in cerebral palsy is presented along with a brief discussion of the current treatment program, which is illustrated by a case example.
Abstract: This article summarizes our experience with cerebral palsy over the past 20 years. The primary and secondary deformities that occur with cerebral palsy are described. Following this, there is a brief overview of the nature and role of gait analysis in the treatment of gait problems in cerebral palsy. The concept of lever-arm dysfunction is introduced. Our current treatment algorithm is then presented along with a brief discussion of our current treatment program, which is illustrated by a case example. Finally, a brief study of a group of patients with spastic diplegia or quadriplegia is presented to illustrate our current method of evaluating treatment outcomes and the need for team management in the treatment of this complex condition.

342 citations

Book
25 Oct 1991
TL;DR: The use of gait analysis in the treatment of cerebral palsy is described, where the use of a videotape, EMG and force plates allows the study of the origins of a child's abnormal gait.
Abstract: A recent advance in the study of walking patterns has been the development of the gait laboratory, where the use of a videotape, EMG and force plates allows the study of the origins of a child's abnormal gait. This book describes the use of gait analysis in the treatment of cerebral palsy.

324 citations


Cited by
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Journal ArticleDOI
TL;DR: OpenSim is developed, a freely available, open-source software system that lets users develop models of musculoskeletal structures and create dynamic simulations of a wide variety of movements to simulate the dynamics of individuals with pathological gait and to explore the biomechanical effects of treatments.
Abstract: Dynamic simulations of movement allow one to study neuromuscular coordination, analyze athletic performance, and estimate internal loading of the musculoskeletal system. Simulations can also be used to identify the sources of pathological movement and establish a scientific basis for treatment planning. We have developed a freely available, open-source software system (OpenSim) that lets users develop models of musculoskeletal structures and create dynamic simulations of a wide variety of movements. We are using this system to simulate the dynamics of individuals with pathological gait and to explore the biomechanical effects of treatments. OpenSim provides a platform on which the biomechanics community can build a library of simulations that can be exchanged, tested, analyzed, and improved through a multi-institutional collaboration. Developing software that enables a concerted effort from many investigators poses technical and sociological challenges. Meeting those challenges will accelerate the discovery of principles that govern movement control and improve treatments for individuals with movement pathologies.

3,621 citations

Journal ArticleDOI
TL;DR: The relatively small number of body surface markers used in the VICON system render it easy to implement for use in routine clinical gait evaluations and should be a useful reference for describing and comparing pathologic gait patterns.

2,953 citations

Journal ArticleDOI
TL;DR: The gait analysis laboratory provides quantified assessments of human locomotion which assist in the orthopaedic management of various pediatric gait pathologies by utilizing a video-based data collection strategy similar to commercially available systems for motion data collection.

2,684 citations

Journal ArticleDOI
TL;DR: The Standardization and Terminology Committee (STC) of the International Society of Biomechanics proposes definitions of JCS for the ankle, hip, and spine, and suggests that adopting these standards will lead to better communication among researchers and clinicians.

2,650 citations

Journal ArticleDOI
TL;DR: A model is developed of the human lower extremity to study how changes in musculoskeletal geometry and musculotendon parameters affect muscle force and its moment about the joints and the joint moments calculated with the model compare well with experimentally measured isometric joint moments.
Abstract: A model is developed of the human lower extremity to study how changes in musculoskeletal geometry and musculotendon parameters affect muscle force and its moment about the joints. The lines of action of 43 musculotendon actuators were defined based on their anatomical relationships to three-dimensional bone surface representations. A model for each actuator was formulated to compute its isometric force-length relation. The kinematics of the lower extremity were defined by modeling the hip, knee, ankle, subtalar, and metatarsophalangeal joints. Thus, the force and joint moment that each musculotendon actuator develops can be computed for any body position. The joint moments calculated with the model compare well with experimentally measured isometric joint moments. A graphical interface to the model has also been developed. It allows the user to visualize the musculoskeletal geometry and to manipulate the model parameters to study the biomechanical consequences of orthopaedic surgical procedures. For example, tendon transfer and lengthening procedures can be simulated by adjusting the model parameters according to various surgical techniques. Results of the simulated surgeries can be analyzed quickly in terms of postsurgery muscle forces and other biomechanical variables. >

1,913 citations