Date: Mon, 21 Sep 92 10:54:13 -0500 Reply-To: meglan@MAYO.EDU Sender: Biomechanics and Movement Science listserver From: meglan@MAYO.EDU Subject: Locomotion Analysis Software Available This is a brief description of a locomotion analysis package that I have developed over the past several years. Hope someone will find it useful. -dwight meglan ----------- Software for the Analysis and Display of Human Locomotion The Anz/Telio/Show3d package is a set of computer programs for use in the research as well as the clinical evaluation of human locomotion. Together, these allow the analysis, plotting, and graphical display in 3 dimensions of body segment kinematics and kinetics. The software, developed for VAX/VMS in FORTRAN at The Ohio State University Gait Analysis Lab, is being made available in source code and executable form to facilitate researchers and clinicians in the development of their own locomotion analysis software. ANZ Anz uses measured marker trajectories to produce estimates of spatial limb kinematics, absolute and relative, including translational and rotational velocities and accelerations. These can be combined with force plate data to evaluate net joint resultant loads and joint power transfers. The majority of the analysis methods are based upon segmental local coordinate systems that are marker system independent. Several marker sets are currently supported. Many general kinematics and kinetics procedures are included as well as a number of gait specific evaluations. In a number of evaluations, several methods are provided to do the same calculation. Muscle EMG data may also be processed with digital filtering. The program is command line based and can be operated interactively for exploratory analysis or, when running under VMS, can be used repeatedly via command files to yield a product- ion environment for clinical gait evaluation. The results of an analysis are stored in a single binary format file constructed to be transportable between different computers. The contents of this file can be examined with Telio to produce graphs, Show3d to produce 3D figures, or exported from Anz in text format for further processing. The commands used to produce the analysis results are stored in the Anz binary file providing a history of the calculation process. TELIO Telio is a command line driven program to graphically display the results of Anz analyses. It can also read several data file formats native to the VICON marker tracking system. The program has a flexible display format so that screen displays and/or printouts can be produced using either time series or crossplotting of data. Data may be read from multiple files and a number of graphs generated at one time. A macro facility has been included to simplify generating complex displays. Combined with a command file in VMS, printouts of data can be produced without any user interaction. Thus, the program functions as both an exploratory and a production display tool. A number of gait specific features are included to produce clinically useful gait displays. The DI3000 graphics subroutine library from Precision Visuals Inc. is used to provide device independent graphics capabilities. This package must be installed to use Telio. The source code must be modified if another graphics package is used. SHOW3D Show3d generates 3D views of marker trajectories and body segments as analyzed by Anz to allow visualization of motion from any direction. Body segments are represented by parallelapipeds to emphasize nonsagittal plane motions. Segments may be represented with hidden lines removed. A number of customization options are available including the display of the images on screen and/or via printed form. This program also uses the DI3000 graphics package. A recent addition to Show3d is that the ground reaction forces can be superimposed on the segment display or displayed separately. SOURCE CODE The source code uses VAX extensions to FORTRAN but no system specific routines, so any FORTRAN compiler supporting VAX extensions can be used. Presently, the software supports VICON and AMASS video and analog data files. Support for Motion Analysis Corporation marker and analog data files has been added recently. [ Moderator's note: Your UNIX operating system may provide a utility (f77cvt) to convert VAX/VMS source code to standard FORTRAN-77. If not, manual conversion is not too difficult. - TvdB ] The source code is rather large, totaling more than 1.5 MBytes. The software is copyrighted and has been placed in the public domain as a research and instructional tool only and as such is UNSUPPORTED. The source code may be freely modified and redistributed for nonprofit purposes as long as the changes are clearly marked and the origin of the software, The Ohio State University Gait Analysis Laboratory, is mentioned. AVAILABILITY Source code only of these programs is available in UNIX, PC, and Macintosh archive formats while source code as well as executables and sample data are available for VAX/VMS in compressed, backup format files. The UNIX, PC, and Mac archives are available via anonymous FTP from two sites: ftp.nici.kun.nl in directory pub/biomch-l magnus.acs.ohio-state.edu in directory pub/gaitlab The VAX/VMS backup files are only available from magnus.acs.ohio-state.edu A readme.txt file at each site provides details about obtaining and dearchiving the files. Several text files describing the commands in ANZ and TELIO as well as a detailed overview of ANZ's calculation capabilities are also available at the archive sites. Copies of hand written notes of the derivations of the kinematics and kinetics algorithms within ANZ (~50 pages) are availabe from the program author for $10 US (to cover duplication and shipping). If FTP access is not available, the PC or Macintosh archives with derivation notes can be obtained from the author for $20 US. The VAX/VMS files can be ordered on 1/2" tape only for $30 US. All requests for derivation notes or copies of the software should be sent prepaid in US currency to: Dwight Meglan Orthopaedic Biomechanics Laboratory The Mayo Clinic 128 Guggenheim Rochester, MN 55906 USA meglan@mayo.edu