Document Detail

Pelvic flexion measurement from lateral projection radiographs is clinically reliable.
MedLine Citation:
PMID:  23283671     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Pelvic flexion affects orientation of the acetabular cup; however, pelvic position is not static in daily activities. During THA it is difficult to know the degree of pelvic flexion with the patient in the lateral position and that position is static. However, surgeons need to appropriately determine pelvic tilt to properly insert the acetabular component.
QUESTIONS/PURPOSES: We investigated the reliability of pelvic flexion angle that was measured by manually identifying the location of the pubic symphysis and bilateral anterior superior iliac spines using synthesized lateral radiographs.
METHODS: We synthesized 49 lateral radiographs based on CT data. Each of the 49 radiographs had a unique position: 7° of varying lateral tilt and rotation in each of seven selected pelvic flexion angles. The pelvic flexion angle was measured three times by three independent observers in each position and determined the accuracy (based on the true value from the reconstructions) and reliability of the measures.
RESULTS: The measurement error was 0.1° (range, -4.8° to 4.0°). There was a tendency for errors when the pelvic flexion angle was 0° or ±5°; the errors were less when the pelvic flexion angle was ±10° or ±20°. Lateral tilt was associated with greater error than rotation. The intraclass correlation coefficient (ICC) of the average value was 0.967. For one observer, more than two measurements are necessary for the ICC to be greater than 0.8, and only one measurement was needed for two of the three observers.
CONCLUSIONS: Our data suggest measurement of pelvic flexion angle using lateral radiographs is reliable. We recommend the measurement be performed once by two observers for better reliability.
Norio Imai; Tomoyuki Ito; Ken Suda; Dai Miyasaka; Naoto Endo
Publication Detail:
Type:  Journal Article     Date:  2013-01-03
Journal Detail:
Title:  Clinical orthopaedics and related research     Volume:  471     ISSN:  1528-1132     ISO Abbreviation:  Clin. Orthop. Relat. Res.     Publication Date:  2013 Apr 
Date Detail:
Created Date:  2013-03-04     Completed Date:  2013-05-16     Revised Date:  2014-04-01    
Medline Journal Info:
Nlm Unique ID:  0075674     Medline TA:  Clin Orthop Relat Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1271-6     Citation Subset:  AIM; IM    
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MeSH Terms
Arthroplasty, Replacement, Hip*
Femoracetabular Impingement / physiopathology,  radiography*,  surgery
Pelvic Bones / physiopathology*,  radiography*
Range of Motion, Articular
Reproducibility of Results
Tomography, X-Ray Computed*

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

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