Pelvic Tilt Cannot Be Accurately Predicted Using Anteroposterior Radiographs

10 pages•Published: October 26, 2019

Zlatan Cizmic, Jonathan Gabor, Nima Eftekhary, Hayeem Rudy, Michael O'Sullivan, Ran Schwarzkopf, Aaron Buckland and Jonathan Vigdorchik

Abstract

INTRODUCTION: Pelvic positioning during total hip arthroplasty (THA) can affect the functional position of the acetabular component. A comprehensive understanding of pelvic orientation prior to THA is necessary to allow for proper cup positioning and mitigate the risks of complications associated with component malpositioning. Measurements using anteroposterior (AP) radiographs have been described as an effective means of accurately predicting pelvic functional orientation. The purpose of our study was to describe the accuracy of assessing pelvic tilt using AP radiographs alone.

METHODS: An online survey was created and sent to a cohort of fellowship-trained adult reconstruction surgeons. The survey consisted of 65 standing AP pelvis radiographs. Participants were asked to score each radiograph as 1) anterior pelvic tilt > 10 degrees, 2) posterior pelvic tilt > 10 degrees, or 3) neutral. Responses were then compared to measurements of pelvic tilt made on lateral standing pelvic radiographs. Categorical and continuous variables were compared using chi-squared, unpaired, two-tailed student’s T tests, and ANOVA.

RESULTS: 135 surgeons completed the survey. The average correct predictive value of pelvic tilt between all surgeons was 53.2%. 51.2% of responding surgeons performed greater than 100 cases per year. 50% of surgeons reported that they were “not so familiar” or “somewhat familiar” with the principles of spinopelvic mobility. 43.5% of surgeons reported that they did not routinely use spinopelvic mobility principles in THA planning.

DISCUSSION: The standing AP pelvis radiograph is poorly predictive of pelvic tilt. Pre-operative evaluation of spinopelvic parameters requires AP and lateral pelvic views for detailed assessment and accurate pre-operative planning.

Keyphrases: ap radiograph, pelvic tilt, radiography

In: Patrick Meere and Ferdinando Rodriguez Y Baena (editors). CAOS 2019. The 19th Annual Meeting of the International Society for Computer Assisted Orthopaedic Surgery, vol 3, pages 62-71.

Links:	https://easychair.org/publications/paper/h4MH
	https://doi.org/10.29007/mx2k

BibTeX entry

@inproceedings{CAOS2019:Pelvic_Tilt_Cannot_Be,
  author    = {Zlatan Cizmic and Jonathan Gabor and Nima Eftekhary and Hayeem Rudy and Michael O'Sullivan and Ran Schwarzkopf and Aaron Buckland and Jonathan Vigdorchik},
  title     = {Pelvic Tilt Cannot Be Accurately Predicted Using Anteroposterior Radiographs},
  booktitle = {CAOS 2019. The 19th Annual Meeting of the International Society for Computer Assisted Orthopaedic Surgery},
  editor    = {Patrick Meere and Ferdinando Rodriguez Y Baena},
  series    = {EPiC Series in Health Sciences},
  volume    = {3},
  publisher = {EasyChair},
  bibsource = {EasyChair, https://easychair.org},
  issn      = {2398-5305},
  url       = {/publications/paper/h4MH},
  doi       = {10.29007/mx2k},
  pages     = {62-71},
  year      = {2019}}

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