FEAR index in predicting treatment among patients with femoroacetabular impingement and hip dysplasia and the relationship of femoral version

Alex M. Meyer; Andrew L. Schaver; Brian H. Cohen; Natalie A. Glass; Michael C. Willey; Robert W. Westermann

doi:10.1093/jhps/hnac023

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FEAR index in predicting treatment among patients with femoroacetabular impingement and hip dysplasia and the relationship of femoral version

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FEAR index in predicting treatment among patients with femoroacetabular impingement and hip dysplasia and the relationship of femoral version

Alex M. Meyer, Andrew L. Schaver, Brian H. Cohen, Natalie A. Glass, Michael C. Willey and Robert W. Westermann

Journal of hip preservation surgery, Vol.9(2), pp.84-89

07/16/2022

DOI: 10.1093/jhps/hnac023

PMCID: PMC9291381

PMID: 35854808

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Abstract

The Femoro-Epiphyseal Acetabular Roof (FEAR) index is a newer measurement to identify the hip instability with borderline acetabular dysplasia. The purpose of this study is to (i) validate the FEAR index in determining the stability of the hip in patients who have previously been treated surgically for femoroacetabular impingement (FAI) and/or developmental dysplasia of the hip (DDH) and (ii) to examine the relationship between the FEAR index and femoral version, lateral center edge angle, Tonnis angle and alpha angle (AA). Patient demographics and radiographic measurements of 215 hips (178 patients), 116 hips treated with hip arthroscopy for FAI and 99 hips treated with periacetabular osteotomy (PAO) for DDH were compared between groups. The sensitivity and specificity of the FEAR index to detect the surgical procedure performed (PAO or hip arthroscopy) was calculated, and a threshold value was proposed. Pearson's correlation coefficients were used to describe the relationships between the FEAR index, femoral version and other radiographic measurements. The FEAR index was higher in patients with DDH versus FAI (DDH: 2.81 +/- 0.50 degrees versus FAI: -1.00 +/- 0.21 degrees, P < 0.001). A FEAR index threshold value of 3 degrees had a sensitivity and specificity of 80% and 81%, respectively, for correctly predicting the surgical procedure performed. Femoral version was positively associated with the FEAR index in the setting of DDH (r = 0.36, P = 0.001) but not FAI (r = 0.02, P = 0.807). A FEAR index of 3 degrees predicted treatment with 80% sensitivity and 81% specificity. In addition, femoral version significantly correlates with the FEAR index in the setting of DDH but not FAI.

Orthopedics

Life Sciences & Biomedicine

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Details

Title: Subtitle: FEAR index in predicting treatment among patients with femoroacetabular impingement and hip dysplasia and the relationship of femoral version
Creators: Alex M. Meyer - Roy J. and Lucille A. Carver College of Medicine
Andrew L. Schaver - University of Iowa
Brian H. Cohen - Orthopedic Associates, Cranston, RI 02910, USA.
Natalie A. Glass - University of Iowa
Michael C. Willey - University of Iowa
Robert W. Westermann - University of Iowa
Resource Type: Journal article
Publication Details: Journal of hip preservation surgery, Vol.9(2), pp.84-89
DOI: 10.1093/jhps/hnac023
PMID: 35854808
PMCID: PMC9291381
NLM abbreviation: J Hip Preserv Surg
ISSN: 2054-8397
eISSN: 2054-8397
Publisher: Oxford Univ Press
Number of pages: 6
Language: English
Date published: 07/16/2022
Academic Unit: Orthopedics and Rehabilitation; Surgery; Injury Prevention Research Center; Athletic Training Program
Record Identifier: 9984305863502771

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