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BioMed Research International
Volume 2017, Article ID 8562329, 6 pages
Research Article

Prevalence of Cam and Pincer Deformities in the X-Rays of Asymptomatic Individuals

1Orthopedic and Trauma Surgery Center, University Medical Centre Mannheim, University of Heidelberg, Theodor-Kutzer-Ufer 1-3, 68167 Mannheim, Germany
2Institute of Biostatistics, Medical Faculty Mannheim, University of Heidelberg, Ludolf-Krehl-Straße 13-17, 68167 Mannheim, Germany
3Sporthopaedicum Straubing, Bahnhofplatz 27, 94315 Straubing, Germany
4Department of Orthopaedic Surgery, Medical University Innsbruck, Anichstrasse 35, 6020 Innsbruck, Austria

Correspondence should be addressed to Alexander Brunner; ed.bew@rennurb.r-a

Received 23 June 2017; Accepted 28 November 2017; Published 18 December 2017

Academic Editor: Sae Hoon Kim

Copyright © 2017 Steffen Thier et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Objective. The presence of radiological signs of femoroacetabular impingement (FAI) is not necessarily associated with symptoms. Hence, the prevalence of cam and pincer deformities in the overall population may be underestimated. The purpose of this study was to screen an unselected cohort of people without hip symptoms for native radiological signs of cam and pincer deformities to determine their actual prevalence. Materials and Methods. 110 asymptomatic patients had AP pelvis X-rays and cross-table hip X-rays performed. We evaluated the images for the presence of cross-over signs and measured lateral center edge (LCE) angles, alpha angles (α-angles), and femoral offset ratios. Results. Positive cross-over signs were seen in 34%; LCE angles > 40° in 13%; and femoral offset ratios < 0.18 in 43%. In 41% of the patients, α-angles were >50°. Male patients showed significantly higher α-angles, lower offset ratios, and a higher prevalence of cross-over signs. In contrast, female patients had significantly higher LCE angles. Conclusion. According to our data, radiological signs of cam and pincer deformities are common in asymptomatic people. In clinical practice, patients presenting with hip pain and radiological signs of FAI should undergo further diagnostic evaluation. However, in asymptomatic patients, no further evaluation is recommended.