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Utility of False Profile View for Screening of Ischiofemoral Impingement
Dae-Kyung Kwak1, Ick-Hwan Yang1, Sungjun Kim2
1Department of Orthopedic Surgery, Yonsei University College of Medicine, Seoul, Korea.
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.
Insights
The false profile view is an effective screening tool for ischiofemoral impingement (IFI), a condition often missed due to its rarity. This imaging technique accurately identifies decreased ischiofemoral space (IFS) in IFI patients.
Area of Science:
- Radiology
- Orthopedic Imaging
- Musculoskeletal Diagnostics
Background:
- Ischiofemoral impingement (IFI) is an uncommon hip condition.
- Diagnosis often relies on magnetic resonance imaging (MRI), potentially delaying detection.
- A simpler screening method is needed to improve early diagnosis.
Purpose of the Study:
- To assess the utility of the false profile view as a screening tool for IFI.
- To compare the diagnostic accuracy of the false profile view with the anteroposterior (AP) view for IFI.
Main Methods:
- Retrospective analysis of 58 IFI patients and 58 matched controls.
- Measurement of ischiofemoral space (IFS) using hip AP and false profile views.
- Comparison of IFS measurements with MRI findings, including quadratus femoris space (QFS).
Main Results:
- Patients with IFI showed significantly reduced IFS on both false profile and AP views (P<0.01).
- The false profile view demonstrated a higher area under the ROC curve (0.967) compared to the AP view (0.841).
- A cutoff IFS of 10.3 mm on the false profile view achieved 88.2% sensitivity and 88.4% specificity for IFI diagnosis.
Conclusions:
- The false profile view serves as a valuable screening tool for identifying potential ischiofemoral impingement.
- This radiographic view can aid in the early detection of IFI, complementing MRI diagnostics.
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