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Utility of False Profile View for Screening of Ischiofemoral Impingement

 Dae-Kyung Kwak  ;  Ick-Hwan Yang  ;  Sungjun Kim  ;  Sang-Chul Lee  ;  Kwan-Kyu Park  ;  Woo-Suk Lee 
 Hip & Pelvis, Vol.30(4) : 219-225, 2018 
Journal Title
Hip & Pelvis
Issue Date
False profile view ; Ischiofemoral impingement ; Ischiofemoral space ; Quadratus femoris space
Purpose: Ischiofemoral impingement (IFI)-primarily diagnosed by magnetic resonance imaging (MRI)-is an easily overlooked disease due to its low incidence. The purpose of this study was to evaluate the usefulness of false profile view as a screening test for IFI.

Materials and Methods: Fifty-eight patients diagnosed with IFI between June 2013 and July 2017 were enrolled in this retrospective study. A control group (n=58) with matching propensity scores (age, gender, and body mass index) were also included. Ischiofemoral space (IFS) was measured as the shortest distance between the lateral cortex of the ischium and the medial cortex of lesser trochanter in weight bearing hip anteroposterior (AP) view and false profile view. MRI was used to measure IFS and quadratus femoris space (QFS). The receiver operating characteristics (ROC), area under the ROC curve (AUC) and cutoff point of the IFS were measured by false profile images, and the correlation between the IFS and QFS was analyzed using the MRI scans.

Results: In the false profile view and hip AP view, patients with IFI had significantly decreased IFS (P<0.01). In the false profile view, ROC AUC (0.967) was higher than in the hip AP view (0.841). Cutoff value for differential diagnosis of IFI in the false profile view was 10.3 mm (sensitivity, 88.2%; specificity, 88.4%). IFS correlated with IFS (r=0.744) QFS (0.740) in MRI and IFS (0.621) in hip AP view (P<0.01).

Conclusion: IFS on false profile view can be used as a screening tool for potential IFI.
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Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Orthopedic Surgery (정형외과학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Radiology (영상의학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Rehabilitation Medicine (재활의학교실) > 1. Journal Papers
Yonsei Authors
Kim, Sungjun(김성준) ORCID logo https://orcid.org/0000-0002-7876-7901
Park, Kwan Kyu(박관규) ORCID logo https://orcid.org/0000-0003-0514-3257
Yang, Ick Hwan(양익환)
Lee, Sang Chul(이상철) ORCID logo https://orcid.org/0000-0002-6241-7392
Lee, Woo Suk(이우석) ORCID logo https://orcid.org/0000-0002-0798-1660
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