Document Detail

A variability study of computerized sagittal spinopelvic radiologic measurements of trunk balance.
MedLine Citation:
PMID:  15687855     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: The accurate measurement of spinal and pelvic alignment in the sagittal plane is of prime importance for various disorders. Pelvic incidence (PI) is a fundamental anatomic parameter that is specific and constant for each adult individual and is related to pelvic orientation as well as to the size of lumbar lordosis (LL). It is the summation of the sacral slope (SS) and pelvic tilt (PT), two position-dependent variables that determine pelvic orientation in the sagittal plane. The authors have proposed a computer software designed to measure PI, SS, PT, LL, and thoracic kyphosis (TK) on standardized standing lateral digitized x-rays of the spine and pelvis. The purpose of this study was to evaluate the inter- and intraobserver variability of measurements using this software, to determine if it can be used reliably in a clinical environment. METHODS: The standing lateral x-rays of 30 subjects were randomly selected from the database of two medical institutions. The normal population had standard radiographs on which the various pertinent landmarks were marked by one operator prior to digitization, whereas the scoliotic population had digital radiographs that obviated the need for prior marking of landmarks. Four individuals measured all variables on the 30 x-rays on two occasions, with a 15-day interval between the two sessions. Statistical analysis was done with intraclass correlation coefficients (ICCs). RESULTS: The ICC measured within observers was between 0.93 and 0.99, whereas the ICC between observers varied between 0.92 and 0.99. The variations observed were similar for normal and scoliotic subjects, and prior marking of the x-rays had no significant influence. CONCLUSION: We conclude that the variability of measurements with this method is lower than with similar radiologic measures done manually and that the use of this software can be recommended for future clinical and research studies of spinopelvic sagittal balance.
E Berthonnaud; H Labelle; P Roussouly; G Grimard; G Vaz; J Dimnet
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Validation Studies    
Journal Detail:
Title:  Journal of spinal disorders & techniques     Volume:  18     ISSN:  1536-0652     ISO Abbreviation:  J Spinal Disord Tech     Publication Date:  2005 Feb 
Date Detail:
Created Date:  2005-02-02     Completed Date:  2005-06-07     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  101140323     Medline TA:  J Spinal Disord Tech     Country:  United States    
Other Details:
Languages:  eng     Pagination:  66-71     Citation Subset:  IM    
Optimage, Group of Applied Research in Orthopaedics, Lyon, France.
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MeSH Terms
Image Processing, Computer-Assisted
Middle Aged
Pelvic Bones / radiography*
Postural Balance*
Spinal Cord / radiography*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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