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KMID : 1147920220050020068
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Medical Biological Science and Engineering
2022 Volume.5 No. 2 p.68 ~ p.72
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Reliability of simple radiographic signs in detecting pincer-type femoroacetabular impingement
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Kim Soo-Ah
Jo Sueng-Hwan
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Abstract
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The current study aims to investigate the reliability of x-ray based radiologic signs for detecting pincer type femoroacetabular impingement (FAI). The study comprises of 200 patients between age 18 and 50 years who had taken simple pelvis radiograph (pelvis AP X-ray) and pelvic computed tomography (CT) scan between January 2015 and December 2017. The cross over sign, ischial tuberosity sign and posterior wall sign were recorded. The prevalence of the X-ray based signs were compared with the cranial and the central versions of the acetabulum measured on the axial CT scan to validate the accuracy of each parameters. The cross over sign was positive in 18.4%, posterior wall sign in 17.9% and posterior ischial tuberosity sign in 16.3%. The acetabular cranial retroversion was noted in 3.8%, and central retroversion in 2.3% of the cohort. Among the x-ray based parameters for detecting pincer FAI, ischial tuberosity sign showed the highest sensitivity (83.3) while all three parameters showed high specificity for reflecting cranial retroversion (83.1-84.1). For central retroversion, all three parameters showed low sensitivity (44.4-55.6) while the specificity was relatively high in all three (83.7-84.6). The current study indicates that for the radiologic diagnosis of the pincer type FAI, prominent ischial tuberosity sign provides the highest sensitivity and specificity for detecting cranial retroversion of the acetabulum. However, sensitivity for detecting central retroversion was low in all three parameters indicating the advanced imaging is necessary to accurately diagnose pincer type FAI.
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KEYWORD
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Acetabulum, Cross over sign, Ischial tuberosity sign, Femoroacetabular impingement, Pincer
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