Citation, DOI, disclosures and article data
Citation:
Sriselvakumar S, Knipe H, Femoro-epiphyseal acetabular roof (FEAR) index. Reference article, Radiopaedia.org (Accessed on 23 Apr 2024) https://doi.org/10.53347/rID-157162
Disclosures:
At the time the article was last revised Henry Knipe had the following disclosures:
- Radiopaedia Events Pty Ltd, Speaker fees (past)
- Integral Diagnostics, Shareholder (ongoing)
- Micro-X Ltd, Shareholder (ongoing)
These were assessed during peer review and were determined to
not be relevant to the changes that were made.
View Henry Knipe's current disclosures
The femoro-epiphyseal acetabular roof (FEAR) index is a radiographic measurement to help identify clinical hip microinstability in acetabular dysplasia.
Usage
The FEAR index should be used in conjunction with clinical and other radiographic features for the identification of clinically unstable dysplastic hips 3.
Measurement
To measure the FEAR index, a line is drawn along the lateral and medial points of the center of the femoral head physeal scar, and a second line is drawn between the medial and lateral points of the acetabular sourcil 1.
Interpretation
A positive FEAR index has been purported as between ≥3-5º 2-4.
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1. Wyatt M, Weidner J, Pfluger D, Beck M. The Femoro-Epiphyseal Acetabular Roof (FEAR) Index: A New Measurement Associated With Instability in Borderline Hip Dysplasia? Clin Orthop Relat Res. 2017;475(3):861-9. doi:10.1007/s11999-016-5137-0 - Pubmed
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2. Meyer A, Schaver A, Cohen B, Glass N, Willey M, Westermann R. FEAR Index in Predicting Treatment Among Patients with Femoroacetabular Impingement and Hip Dysplasia and the Relationship of Femoral Version. J Hip Preserv Surg. 2022;9(2):84-9. doi:10.1093/jhps/hnac023 - Pubmed
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3. Schwabe M, Clohisy J, A Graesser E, Pascual-Garrido C, Nepple J. External Validation of the FEAR Index in Borderline Acetabular Dysplasia. Orthop J Sports Med. 2022;10(8):23259671221113837. doi:10.1177/23259671221113837 - Pubmed
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4. Truntzer J, Hoppe D, Shapiro L, Safran M. Can the FEAR Index Be Used to Predict Microinstability in Patients Undergoing Hip Arthroscopic Surgery? Am J Sports Med. 2019;47(13):3158-65. doi:10.1177/0363546519876105 - Pubmed
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