Radiographic markers of femoroacetabular impingement: Correlation of herniation pit and femoral bump with a positive cross-over ratio

Max J. Scheyerer, Carol E. Copeland, Jeffrey Stromberg, Thomas Ruckstuhl, Clément M.L. Werner

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Introduction. The goal of this study was to research the association of femoral bumps and herniation pits with the overlap-ratio of the cross-over sign. Methods. Pelvic X-rays and CT-scans of 2925 patients with good assessment of the anterior and the posterior acetabular wall and absence of neutral pelvic tilt were enrolled in the investigation. Finally pelvic X-rays were assessed for the presence of a positive cross-over sign, and CT-scans for a femoral bump or a herniation pit. Additionally, if a positive cross-over sign was discovered, the overlap-ratio was calculated. Results. A femoral bump was found in 53.3% (n = 1559), and a herniation pit in 27.2% (n = 796) of all hips. The overlap-ratio correlated positively with the presence of a femoral bump, while a negative correlation between the overlap-ratio and the presence of a herniation pit was found. The latter was significantly more often combined with a femoral bump than without. Conclusions. We detected an increased prevalence of femoral bump with increasing overlap-ratios of the cross-over sign indicating a relation to biomechanical stress. The observed decreased prevalence of herniation pits with increasing overlap-ratios could be explained by reduced mechanical stress due to nontightened iliofemoral ligament in the presence of retroversion of the acetabulum.

Original languageEnglish (US)
Article number432728
JournalAdvances in Orthopedics
Volume2014
DOIs
StatePublished - 2014

All Science Journal Classification (ASJC) codes

  • Orthopedics and Sports Medicine

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