A quantitative method to assess focal acetabular overcoverage resulting from pincer deformity using CT data

Ryan J. Murphy, Ty Subhawong, Avneesh Chhabra, John A. Carrino, Mehran Armand, Marc Hungerford

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Background: Current assessment techniques for focal acetabular overcoverage are neither consistent nor quantitatively accurate. Questions/purposes: We propose: (1) a method to precisely quantify the amount of focal acetabular overcoverage in a patient's pincer deformity based on CT data; (2) to evaluate the consistency of this method; and (3) to compare the method with conventional radiographic assessments. Methods: We developed a method to assess focal acetabular overcoverage using points selected from CT scans along the acetabular rim after realigning the pelvis into a neutral position. Using four resampled and segmented pelvic CT scans of cadaveric specimens with virtually induced impingement, two observers independently tested the algorithm's consistency. Our algorithm assessed the amount of focal acetabular overcoverage using CT data and projected data from reconstructed radiographs. Results: (1) We successfully showed the feasibility of the software to produce consistent, quantitative measurements. (2) Testing showed the average difference between observers in aligning the pelvis was 0.42°, indicative of a consistent approach. (3) Differences between measurements on three-dimensional (3-D) CT and simulated radiographs were significant. Conclusions: The proposed method represents a new avenue in consistently quantifying focal acetabular overcoverage using CT models while correcting for pelvic tilt and rotation. Our analysis confirms AP hip radiograph simulations overestimate the amount of overhanging acetabular rim in a pincer deformity. Clinical Relevance: This technique has potential to improve preoperative diagnostic accuracy and enhance surgical planning for correction of a pincer deformity resulting from focal acetabular overcoverage.

Original languageEnglish
Pages (from-to)2846-2854
Number of pages9
JournalClinical Orthopaedics and Related Research
Volume469
Issue number10
DOIs
StatePublished - Oct 1 2011
Externally publishedYes

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Pelvis
Hip
Software

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

Cite this

A quantitative method to assess focal acetabular overcoverage resulting from pincer deformity using CT data. / Murphy, Ryan J.; Subhawong, Ty; Chhabra, Avneesh; Carrino, John A.; Armand, Mehran; Hungerford, Marc.

In: Clinical Orthopaedics and Related Research, Vol. 469, No. 10, 01.10.2011, p. 2846-2854.

Research output: Contribution to journalArticle

Murphy, Ryan J. ; Subhawong, Ty ; Chhabra, Avneesh ; Carrino, John A. ; Armand, Mehran ; Hungerford, Marc. / A quantitative method to assess focal acetabular overcoverage resulting from pincer deformity using CT data. In: Clinical Orthopaedics and Related Research. 2011 ; Vol. 469, No. 10. pp. 2846-2854.
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