title: Validation of postural radiographs as a way to measure change in pelvic obliquity.
abstract: OBJECTIVE
  To evaluate the validity of using postural radiographs to assess change in pelvic obliquity.
  
  
  METHODS
  Blinded comparison of reference lines and instrument development of postural radiographs.
  
  
  METHODS
  Veterans Administration hospital.
  
  
  METHODS
  Thirty-nine subjects with no history of low back pain.
  
  
  METHODS
  Repeated postural radiographs without heel lifts and with (1/4)-in (6.35-mm) and (1/2)-in (12.7-mm) heel lifts.
  
  
  METHODS
  The change of pelvic obliquity as measured by the intersulcate, interalar, and sacral surface lines on postural radiographs.
  
  
  RESULTS
  A (1/4)-in heel lift resulted in changes of 4.6+/-4.0mm, 3.6+/-3.1mm, and 5.8+/-3.9mm and a (1/2)-in heel lift in changes of 7.8+/-4.3mm, 7.8+/-4.6mm, and 5.2+/-3.8mm for the intersulcate, interalar, and sacral surface lines, respectively. Pearson correlation coefficients were used to correlate the change in pelvic obliquity with the corresponding heights of heel lifts; for the (1/4)-in heel lift, they were.67,.88, and.71, and for (1/2)-in heel lift they were.73,.79, and.87 for the intersulcate, interalar, and sacral surface lines, respectively (all P<.001).
  
  
  CONCLUSIONS
  All the reference lines seem to be valid measures of change of pelvic obliquity relative to the size of the lifts (ie, the changes in pelvic obliquity seem to be causally related and correlated with the lifts). These results also suggest that postural radiographs can be used to determine the magnitude of pelvic obliquity.
authors.affiliation: Department of Physical Medicine and Rehabilitation, Central Arkansas Veterans Healthcare System, University of Arkansas for Medical Sciences, Little Rock, AR, USA. FannAliceV@uams.edu
authors.forename: Alice V
authors.initials: AV
authors.lastname: Fann
mesh_terms: D000328:Adult; D000368:Aged; D002908:Chronic Disease; D005260:Female; D006801:Humans; D007870:Leg Length Inequality / Q000150:complications / Q000503:physiopathology*; D017116:Low Back Pain / Q000209:etiology / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D010388:Pelvis / Q000000981:diagnostic imaging*; D011187:Posture / Q000502:physiology; D011859:Radiography