Laboratory Coordinate System

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Daniel J. Berry - One of the best experts on this subject based on the ideXlab platform.

  • Variation in Postoperative Pelvic Tilt May Confound the Accuracy of Hip Navigation Systems
    2020
    Co-Authors: Sebastien Parratte, Mark W. Pagnano, Kenton R. Kaufman, Krista Coleman-wood Pt, Daniel J. Berry
    Abstract:

    Most computer navigation Systems used in total hip arthroplasty integrate preoperative pelvic tilt to calculate the anterior pelvic plane assuming tilt is constant; however, the consistency of pelvic tilt after THA has never been proven. Therefore, using a modern comprehensive gait analysis before and after arthroplasty we sought to compare (1) dynamic pelvic tilt changes and (2) pelvic flexion/extension range-of-motion changes. Twenty-one patients who underwent unilateral THA were prospectively studied. Quantitative pelvic tilt changes (in the sagittal plane) and pelvic range of flexion/extension motion relative to a Laboratory Coordinate System were compared using a computerized video motion System. Mean gait pelvic tilt was 13.98 ± 4.88 (range, 1.738–23.18) preoperatively, 12.58 ± 4.58 (range, 1.48–18.78) 2 months postoperatively, and 10.5 ± 5.58 (range, –2.368–19.28) 12 months postoperatively. A significant proportion (31%) of patients had more than a 5 difference between preoperative and 12-month postoperative measurements and the variability was spread over 20 . Significant dynamic changes in pelvic tilt occurred after THA. While navigation clearly improves the anatomical position of the component during THA, the functional position of the component will not always be improved because of the significant change between preoperative and postoperative pelvic tilt.

  • The 2008 Frank Stinchfield Award: Variation in Postoperative Pelvic Tilt May Confound the Accuracy of Hip Navigation Systems
    Clinical Orthopaedics and Related Research, 2009
    Co-Authors: Sebastien Parratte, Mark W. Pagnano, Krista Coleman-wood, Kenton R. Kaufman, Daniel J. Berry
    Abstract:

    Most computer navigation Systems used in total hip arthroplasty integrate preoperative pelvic tilt to calculate the anterior pelvic plane assuming tilt is constant; however, the consistency of pelvic tilt after THA has never been proven. Therefore, using a modern comprehensive gait analysis before and after arthroplasty we sought to compare (1) dynamic pelvic tilt changes and (2) pelvic flexion/extension range-of-motion changes. Twenty-one patients who underwent unilateral THA were prospectively studied. Quantitative pelvic tilt changes (in the sagittal plane) and pelvic range of flexion/extension motion relative to a Laboratory Coordinate System were compared using a computerized video motion System. Mean gait pelvic tilt was 13.9º ± 4.8º (range, 1.73º–23.1º) preoperatively, 12.5º ± 4.5º (range, 1.4º–18.7º) 2 months postoperatively, and 10.5° ± 5.5º (range, –2.36º–19.2º) 12 months postoperatively. A significant proportion (31%) of patients had more than a 5° difference between preoperative and 12-month postoperative measurements and the variability was spread over 20°. Significant dynamic changes in pelvic tilt occurred after THA. While navigation clearly improves the anatomical position of the component during THA, the functional position of the component will not always be improved because of the significant change between preoperative and postoperative pelvic tilt.

Sebastien Parratte - One of the best experts on this subject based on the ideXlab platform.

  • Variation in Postoperative Pelvic Tilt May Confound the Accuracy of Hip Navigation Systems
    2020
    Co-Authors: Sebastien Parratte, Mark W. Pagnano, Kenton R. Kaufman, Krista Coleman-wood Pt, Daniel J. Berry
    Abstract:

    Most computer navigation Systems used in total hip arthroplasty integrate preoperative pelvic tilt to calculate the anterior pelvic plane assuming tilt is constant; however, the consistency of pelvic tilt after THA has never been proven. Therefore, using a modern comprehensive gait analysis before and after arthroplasty we sought to compare (1) dynamic pelvic tilt changes and (2) pelvic flexion/extension range-of-motion changes. Twenty-one patients who underwent unilateral THA were prospectively studied. Quantitative pelvic tilt changes (in the sagittal plane) and pelvic range of flexion/extension motion relative to a Laboratory Coordinate System were compared using a computerized video motion System. Mean gait pelvic tilt was 13.98 ± 4.88 (range, 1.738–23.18) preoperatively, 12.58 ± 4.58 (range, 1.48–18.78) 2 months postoperatively, and 10.5 ± 5.58 (range, –2.368–19.28) 12 months postoperatively. A significant proportion (31%) of patients had more than a 5 difference between preoperative and 12-month postoperative measurements and the variability was spread over 20 . Significant dynamic changes in pelvic tilt occurred after THA. While navigation clearly improves the anatomical position of the component during THA, the functional position of the component will not always be improved because of the significant change between preoperative and postoperative pelvic tilt.

  • The 2008 Frank Stinchfield Award: Variation in Postoperative Pelvic Tilt May Confound the Accuracy of Hip Navigation Systems
    Clinical Orthopaedics and Related Research, 2009
    Co-Authors: Sebastien Parratte, Mark W. Pagnano, Krista Coleman-wood, Kenton R. Kaufman, Daniel J. Berry
    Abstract:

    Most computer navigation Systems used in total hip arthroplasty integrate preoperative pelvic tilt to calculate the anterior pelvic plane assuming tilt is constant; however, the consistency of pelvic tilt after THA has never been proven. Therefore, using a modern comprehensive gait analysis before and after arthroplasty we sought to compare (1) dynamic pelvic tilt changes and (2) pelvic flexion/extension range-of-motion changes. Twenty-one patients who underwent unilateral THA were prospectively studied. Quantitative pelvic tilt changes (in the sagittal plane) and pelvic range of flexion/extension motion relative to a Laboratory Coordinate System were compared using a computerized video motion System. Mean gait pelvic tilt was 13.9º ± 4.8º (range, 1.73º–23.1º) preoperatively, 12.5º ± 4.5º (range, 1.4º–18.7º) 2 months postoperatively, and 10.5° ± 5.5º (range, –2.36º–19.2º) 12 months postoperatively. A significant proportion (31%) of patients had more than a 5° difference between preoperative and 12-month postoperative measurements and the variability was spread over 20°. Significant dynamic changes in pelvic tilt occurred after THA. While navigation clearly improves the anatomical position of the component during THA, the functional position of the component will not always be improved because of the significant change between preoperative and postoperative pelvic tilt.

Alexander W Koch - One of the best experts on this subject based on the ideXlab platform.

  • experimental investigation on polarization rotation in twisted optical fiber using Laboratory Coordinate System
    Fiber and Integrated Optics, 2009
    Co-Authors: Hala J Elkhozondar, Mathias Muller, Thorbjorn Buck, Rifa J Elkhozondar, Alexander W Koch
    Abstract:

    Recently, a formulation of the polarization rotation in twisted optical fibers was derived using a coupled-mode approach that, other than existing theories, employs a fixed reference frame. This is interesting for fiber sensing applications, where perturbations, such as strains, are conventionally given in a fixed Laboratory reference frame. Hence, the derived theory can easily be integrated into existing formulations in the Laboratory reference frame. This work demonstrates the experimental verification of the derived theory. An optical fiber is mechanically twisted using an automated test stand, and the change in polarization is recorded. The results are consistent with the theory.

  • Polarization Rotation in Twisted Polarization Maintaining Fibers Using a Fixed Reference Frame
    Journal of Lightwave Technology, 2009
    Co-Authors: Hala J. El-khozondar, Mathias S. Muller, Rifa J. El-khozondar, Alexander W Koch
    Abstract:

    In previous studies addressing polarization evolution in optical fibers, the frame of reference in which polarization rotation in twisted optical fibers is described lacks the compatibility with the modeling of some fiber sensor applications. We therefore introduce a formulation of the polarization evolution in a twisted optical and birefringent fiber, which is based on a Laboratory Coordinate System. We employ coupled mode theory using the fundamental modes of a single mode fiber as a basis. We treat the birefringence of the polarization maintaining fiber and the twist induced birefringence as perturbations introduced into this mode System. We demonstrate the derivation of the coupling coefficients and solve the coupled mode equations for different sets of problems. We compare our results to existing formulations and find an excellent agreement between the theories for highly birefringent fibers.

A. D. Erlykin - One of the best experts on this subject based on the ideXlab platform.

  • The search of the anisotropy of the primary cosmic radiation by the difference method
    EPJ Web of Conferences, 2017
    Co-Authors: V. P. Pavlyuchenko, R. M. Martirosov, N. M. Nikolskaya, A. D. Erlykin
    Abstract:

    On the basis of experimental data obtained in the knee energy region with the GAMMA array an anomaly has been found in the mass composition of primary cosmic rays coming from the region of the VELA cluster. We used an original difference method which has high sensitivity, stability against accidental experimental errors and the possibility to separate anomalies connected with the Laboratory Coordinate System from anomalies observed in the celestial Coordinates. The multiple scattering of the charged particles in the galactic magnetic fields makes it possible to study regions of the sky outside the direct visibility of the array.

  • An anomaly in the properties of primary cosmic rays from the Vela cluster
    Bulletin of the Russian Academy of Sciences: Physics, 2017
    Co-Authors: V. P. Pavlyuchenko, R. M. Martirosov, N. M. Nikolskaya, A. D. Erlykin
    Abstract:

    Based on experimental data obtained by the GAMMA array for the knee energy region, an anomaly is found in the mass composition of primary cosmic rays arriving from the region of the Vela cluster. An original difference method is used that offers high sensitivity, protection against accidental experimental errors, and the ability to separate anomalies associated with the Laboratory Coordinate System from those in celestial Coordinates. Allowing for the multiple scattering of charged particles in the galactic magnetic fields allows parts of the sky not directly visible from the array to be studied.

  • Properties of the difference method for searching for anisotropy of primary cosmic rays
    Bulletin of the Lebedev Physics Institute, 2017
    Co-Authors: V. P. Pavlyuchenko, R. M. Martirosov, N. M. Nikolskaya, A. D. Erlykin
    Abstract:

    Methodical properties and features of the original difference method for searching for the anisotropy in the knee region of the primary cosmic ray energy spectrum are analyzed. It is shown that the method in which properties of particle fluxes, rather than intensities, are studied is stable to randomexperimental errors andmakes it possible to separate anomalies associatedwith the Laboratory Coordinate System from anomalies in the celestial Coordinates. The method uses multiple scattering of charged particles in galactic magnetic fields for studying the entire celestial sphere, including sky regions beyond the installation line of sight.

  • Essential properties of the Difference Method for the Search of the Anisotropy of the Primary Cosmic Radiation
    arXiv: Instrumentation and Methods for Astrophysics, 2015
    Co-Authors: V. P. Pavlyuchenko, R. M. Martirosov, N. M. Nikolskaya, A. D. Erlykin
    Abstract:

    The methodical properties of the original difference method for the search of the anisotropy at the knee region of the primary cosmic radiation energy spectrum are analyzed. The main feature of the suggested method is a study of the difference in the EAS characteristics in different directions but not their intensity. It is shown that the method is stable to the random experimental errors and allows to separate the anomalies related to the Laboratory Coordinate System from the anomalies in the celestial Coordinates. The method uses multiple scattering of the charge particles in the Galaxy magnetic fields to study the whole celestial sphere including the regions outside of the line of sight of the installation.

Kenton R. Kaufman - One of the best experts on this subject based on the ideXlab platform.

  • Variation in Postoperative Pelvic Tilt May Confound the Accuracy of Hip Navigation Systems
    2020
    Co-Authors: Sebastien Parratte, Mark W. Pagnano, Kenton R. Kaufman, Krista Coleman-wood Pt, Daniel J. Berry
    Abstract:

    Most computer navigation Systems used in total hip arthroplasty integrate preoperative pelvic tilt to calculate the anterior pelvic plane assuming tilt is constant; however, the consistency of pelvic tilt after THA has never been proven. Therefore, using a modern comprehensive gait analysis before and after arthroplasty we sought to compare (1) dynamic pelvic tilt changes and (2) pelvic flexion/extension range-of-motion changes. Twenty-one patients who underwent unilateral THA were prospectively studied. Quantitative pelvic tilt changes (in the sagittal plane) and pelvic range of flexion/extension motion relative to a Laboratory Coordinate System were compared using a computerized video motion System. Mean gait pelvic tilt was 13.98 ± 4.88 (range, 1.738–23.18) preoperatively, 12.58 ± 4.58 (range, 1.48–18.78) 2 months postoperatively, and 10.5 ± 5.58 (range, –2.368–19.28) 12 months postoperatively. A significant proportion (31%) of patients had more than a 5 difference between preoperative and 12-month postoperative measurements and the variability was spread over 20 . Significant dynamic changes in pelvic tilt occurred after THA. While navigation clearly improves the anatomical position of the component during THA, the functional position of the component will not always be improved because of the significant change between preoperative and postoperative pelvic tilt.

  • The 2008 Frank Stinchfield Award: Variation in Postoperative Pelvic Tilt May Confound the Accuracy of Hip Navigation Systems
    Clinical Orthopaedics and Related Research, 2009
    Co-Authors: Sebastien Parratte, Mark W. Pagnano, Krista Coleman-wood, Kenton R. Kaufman, Daniel J. Berry
    Abstract:

    Most computer navigation Systems used in total hip arthroplasty integrate preoperative pelvic tilt to calculate the anterior pelvic plane assuming tilt is constant; however, the consistency of pelvic tilt after THA has never been proven. Therefore, using a modern comprehensive gait analysis before and after arthroplasty we sought to compare (1) dynamic pelvic tilt changes and (2) pelvic flexion/extension range-of-motion changes. Twenty-one patients who underwent unilateral THA were prospectively studied. Quantitative pelvic tilt changes (in the sagittal plane) and pelvic range of flexion/extension motion relative to a Laboratory Coordinate System were compared using a computerized video motion System. Mean gait pelvic tilt was 13.9º ± 4.8º (range, 1.73º–23.1º) preoperatively, 12.5º ± 4.5º (range, 1.4º–18.7º) 2 months postoperatively, and 10.5° ± 5.5º (range, –2.36º–19.2º) 12 months postoperatively. A significant proportion (31%) of patients had more than a 5° difference between preoperative and 12-month postoperative measurements and the variability was spread over 20°. Significant dynamic changes in pelvic tilt occurred after THA. While navigation clearly improves the anatomical position of the component during THA, the functional position of the component will not always be improved because of the significant change between preoperative and postoperative pelvic tilt.