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    The effect of a non-specific gluteal contraction on transient stiffness of the sacroiliac joint as measured by Doppler Imaging of Vibrations

    Farquharson, Callum John Isaac

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    Date
    2013
    Citation:
    Farquharson. C.J.I. (2013). The effect of a non-specific gluteal contraction on transient stiffness of the sacroiliac joint as measured by Doppler Imaging of Vibrations. An unpublished thesis submitted in partial requirement for the degree of Master of Osteopathy, Unitec Institute of Technology.
    Permanent link to Research Bank record:
    https://hdl.handle.net/10652/2548
    Abstract
    The complex anatomy and kinematics of the sacroiliac joint (SIJ) has lead to much debate amongst researchers and clinicians, creating a tension between best evidence and clinical practice. A criterion standard quantifying SIJ motion does not yet exist. Doppler imaging of vibration (DIV) is one proposed method of objectively determining SIJ ‘stiffness.’ The DIV technique has shown validity and intra-session reliability, whereas inter-session reliability has thus far been observed as poor due to substandard equipment and biological variability. Despite these limitations, research utilising the DIV technique has continued. Following the design and manufacture of a suitable vibration generator (VG), this study investigated the intra-session reliability of the new VG including control for participant generated downward pressure on the VG, and to investigate the effect of a force closure movement on SIJ stiffness as measured by DIV. Thirteen healthy participants between the ages of 19-57 years were studied. Intra-session reliability was “very high” (ICC[3,3] = 0.79; 95%CI = 0.59 to 0.90) and the standard error of measurement was calculated as 0.62 TU (95%CI = 0.50 to 0.86). A paired samples t-test showed the non-specific force closure movement had a small, nonsignificant effect on SIJ stiffness as measured by DIV (mean increase = 2.08TU; 95%CI = -1.18 to 5.34TU; P=0.20). Participant generated downward force on the VG was observed to be constant throughout each session. Without a change in downward force, the changes in transient SIJ stiffness can more confidently be assumed to come from the force closure movement if we accept the current limitations of the DIV technique and small sample size. DIV requires further investigation into its construct validity before the results of any study employing the DIV technique are applied to any form of clinical practice.
    Keywords:
    sacroiliac joint, Doppler Imaging of vibrations, sacroiliac joint motion, sacroiliac joint dysfunction, sacroiliac joint asymmetry, reliability, gluteal contraction, diagnosis
    ANZSRC Field of Research:
    110499 Complementary and Alternative Medicine not elsewhere classified
    Degree:
    Master of Osteopathy
    Supervisors:
    Moran, Robert
    Rights:
    This digital work is protected by copyright. It may be consulted by you, provided you comply with the provisions of the Act and the following conditions of use: Any use you make of these documents or images must be for research or private study purposes only, and you may not make them available to any other person. You will recognise the author's and publishers rights and give due acknowledgement where appropriate.
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    • Osteopathy Dissertations and Theses [195]

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