Author: Michiel Luyten & Hendrik Croonenborghs
Supervisor: Luc Peeters, MSc
Title: Observation of a pelvic shift in practice. Is it reliable and clinically relevant?
Objective: the purpose of this study was (1) to examine the inter-rater reliability of the visual assessment of a pelvic/lumbar shift in a clinical setting, (2) to find out what the implications of a pelvis shift are on bilateral foot pressure and body sway.
Methods: in this study, 44 subjects (22 male, 22 female) with an average age of 21,75 years (± SD 2.58) were tested. The pelvic shift was examined by taking a photo of the pelvic region while projecting a vertical laser plumb line. Secondary, the effect of a pelvic shift on the division of body weight and body sway was measured during observation using a plantar pressure plate. Per subject, 3 trials of 30 seconds were performed on the pressure plate.
Results: a moderate inter-rater agreement was found, indicating that examiners could define the presence of a pelvic shift (kappa = 0.424), but not assign a direction (kappa = 0.273). Interpretation of subjects with NSLBP showed an overall better kappa (0.462 and 0.590). No overall correlation was found between the pelvic deviation measured on the photo and the body sway in the frontal and sagittal plane, except for the first measurement in the frontal plane (p = .011). A significant correlation was found between the movement of the COG in the frontal and sagittal plane (p ≤ .004). A significant correlation was also found between the degree of deviation and the increase of pressure on the ipsilateral leg (p= .011) for all cases and in the NSLBP group (p = 0.001).
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