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3 results for “joint coordinate system”
Grood and Suntay joint coordinate system for knee kinematics
<p>Grood and Suntay joint coordinate system for description of knee kinematics</p> <p>This software implements the Grood and Suntay joint coordinate system for the clinical description of the three-dimensional motion of the knee. The Grood and Suntay joint coordinate system is described in the research paper :</p> <p>Grood E.S., Suntay W.J., “A joint coordinate system for the clinical description of three-dimensional motions: application to the knee”, J Biomech Eng., 1983 May; 105(2), 136-44, 1983.</p> <p>The software was used in producing the numerical results shown in various research papers such as :</p> <p>Arsene, CT, Gabrys, B., “Probabilistic finite element predictions of the human lower limb model in the total knee replacement”, Med Eng Phys, 2013 Aug; 35(8): 1116-32, 2013.</p> <p>Description of the Matlab files:</p> <p>Uncerpasl.m – starts the process of calculating the knee joint coordinate system;</p> <p>Anglesn.m – calculates the angles and the displacements of interest for the tibio-femoral component</p> <p>Anglespf.m – calculates the angles and the displacements of interest for the patello-femoral component</p> <p>Readinput.m – reads the text files containing the raw data obtained from the Finie Element simulations such as :</p> <p>a) femur_COG_I_X - means the X coordinate of the I point which defines a coordinate system together with points J and K with respect to the center of gravity (COG) of the femoral component.</p> <p>b) femur_COG_X - means the X coordinate of the center of gravity (COG) of the femoral component which together with points I, J , K forms a sort of local coordinate system attached to the femoral component.</p> <p>All the text files such as femur_COG_I_X_1.txt, femur_COG_I_Y_1.txt, etc were produced with the finite element software PAM-CRASH/PAMOPT from the company ESI, Paris, France (<a href="https://www.esi-group.com/">https://www.esi-group.com</a>). The text files contain a single result consisting of 0.12 seconds of the passive flexion cycle and therefore are of no real use but only to verify that the Grood and Suntay Matlab software code works.</p> <p>Please acknowledge the project financed by the European Union Framework Programme 6 (FP6) entitled Decision Support Software for Orthopaedic Surgery and Mr Corneliu T.C. Arsene if you are going to use this software anywhere in your work. The license for this software is a Creative Commons Attribution 4.0 International License (CCL). This project has also a DOI : 10.5281/zenodo.2136822</p> <p>It is provided here with no warranty. Direct all questions and requests to <a href="mailto:galenpalimpsestproject@gmail.com">galenpalimpsestproject@gmail.com</a>.</p>
Data for: A coordinate-system-independent method for comparing joint rotational mobilities
Three-dimensional studies of range of motion currently plot joint poses in an "Euler space" whose axes are angles measured in the joint's three rotational degrees of freedom. Researchers then compute the volume of a pose cloud to measure rotational mobility. However, pairs of poses that are equally different from one another in orientation are not always plotted equally far apart in Euler space. This distortion causes a single joint's mobility to change when measured based on different joint coordinate systems and precludes fair comparisons among joints. Here we present two alternative spaces inspired by a 16th century map projection -- cosine-corrected and sine-corrected Euler spaces -- that allow coordinate-system-independent comparisons of joint rotational mobilities. When tested with data from a bird hip joint, cosine-corrected Euler space demonstrated a ten-fold reduction in variation among mobilities measured from three joint coordinate systems. This new quantitative framework enables previously intractable, comparative studies of articular function.
Data for: A coordinate-system-independent method for comparing joint rotational mobilities
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