Abstract:
STUDY DESIGN:Retrospective review of all CT scans of pelvis and abdomen performed at our institution in October and November 2000. OBJECTIVE:To determine the prevalence and extent of radiographic pelvic asymmetry in a population of patients not preselected for having low back pain. SUMMARY OF BACKGROUND DATA:Pelvic asymmetry refers to asymmetric positioning of landmarks on the two sides of the pelvis and may have a structural or functional etiology. Pelvic asymmetry can be associated with the presence of true leg length discrepancy, lead to false diagnosis or inaccurate measurement of leg length discrepancy, or itself be independently associated with back pain. Although the prevalence of pelvic asymmetry has been reported in patients with back pain to be 24-91%, its prevalence in the general population is not known. METHODS:A total of 323 consecutive CT scans of the pelvis/abdomen were assessed for pelvic asymmetry by one of three examiners. Pelvic asymmetry was defined as an unequal distance from the iliac crests to the acetabuli bilaterally, measured on the anteroposterior scout view of the CT scan. Measurements made on 30 randomly selected scans by the three examiners were used to assess interrater reliability of the measurement method. RESULTS:Pelvic asymmetry ranged in magnitude from -11 mm to 7 mm [right pelvis (mm) - left pelvis (mm)]. Pelvic asymmetry was >5 mm in 17 of 323 (5.3%) and >10 mm in 2 of 323 (0.6%) of the subjects; 172 of 323 (53.3%) had a smaller right hemipelvis (mean asymmetry = -3.0 mm). A total of 95 of 323 (29.4%) had a smaller left hemipelvis (mean asymmetry = 2.1 mm). The intraclass correlation coefficient [ICC(2,1)] between the three observers was high (0.91). CONCLUSION:Pelvic asymmetry of >5 mm was uncommon, with a prevalence of approximately 5% in the population studied. CT scanography was found to be a practical and reliable method for the assessment of suspected pelvic asymmetry.
journal_name
Spine (Phila Pa 1976)journal_title
Spineauthors
Badii M,Shin S,Torreggiani WC,Jankovic B,Gustafson P,Munk PL,Esdaile JMdoi
10.1097/01.BRS.0000065480.44620.C5keywords:
subject
Has Abstractpub_date
2003-06-15 00:00:00pages
1335-9issue
12eissn
0362-2436issn
1528-1159journal_volume
28pub_type
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