Citation, DOI, disclosures and article data
Citation:
Sheikh Z, Weerakkody Y, Knipe H, et al. Lateral center-edge angle. Reference article, Radiopaedia.org (Accessed on 28 Mar 2024) https://doi.org/10.53347/rID-62982
The lateral center-edge angle is a radiographic measurement of the superolateral femoral head bony coverage by the acetabulum. It has since been shown to be superior to the extrusion index in measuring femoral head undercoverage ref.
The lateral center-edge angle has primarily been described in assessing for acetabular dysplasia, but can also be used in femoroacetabular impingement (FAI).
The lateral center-edge angle was first described by Wiberg and is calculated on AP pelvic radiographs by drawing a best fit circle for the inferior and medial margins femoral head. The angle is then measured between two lines drawn from the center of the circle, one running vertically along the longitudinal axis of the pelvis and the other to the lateral acetabular rim 9.
In a modification by Ogata et al., the second line runs to the lateral edge of the acetabular sourcil 6, which is proposed to be a more functional method given that this measurement includes the weight-bearing portion of the acetabulum 8.
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As expected, lateral acetabular rim and acetabular sourcil measurements show significant differences, which need to be taken into account 7. The lateral acetabular rim method overestimates coverage by ~4° compared to the acetabular sourcil method as it includes non-weightbearing bone that forms part of the labral base 8.
Pitfalls
History and etymology
Gunnar Wiberg (1902-1988), a Swedish orthopedic surgeon, first described the lateral center-edge angle in 1939 9,10.
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1. Tannast M, Siebenrock K, Anderson S. Femoroacetabular Impingement: Radiographic Diagnosis--What the Radiologist Should Know. AJR Am J Roentgenol. 2007;188(6):1540-52. doi:10.2214/AJR.06.0921 - Pubmed
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2. Monazzam S, Bomar J, Cidambi K, Kruk P, Hosalkar H. Lateral Center-Edge Angle on Conventional Radiography and Computed Tomography. Clin Orthop Relat Res. 2013;471(7):2233-7. doi:10.1007/s11999-012-2651-6 - Pubmed
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3. Chiamil S & Abarca C. Imaging of the Hip: A Systematic Approach to the Young Adult Hip. Muscles Ligaments Tendons J. 2016;6(3):265-80. doi:10.11138/mltj/2016.6.3.265 - Pubmed
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4. Tannast M, Hanke M, Zheng G, Steppacher S, Siebenrock K. What Are the Radiographic Reference Values for Acetabular Under- and Overcoverage? Clin Orthop Relat Res. 2015;473(4):1234-46. doi:10.1007/s11999-014-4038-3 - Pubmed
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5. Beltran L, Rosenberg Z, Mayo J et al. Imaging Evaluation of Developmental Hip Dysplasia in the Young Adult. AJR Am J Roentgenol. 2013;200(5):1077-88. doi:10.2214/AJR.12.9360 - Pubmed
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6. Ogata S, Moriya H, Tsuchiya K, Akita T, Kamegaya M, Someya M. Acetabular Cover in Congenital Dislocation of the Hip. J Bone Joint Surg Br. 1990;72(2):190-6. doi:10.1302/0301-620X.72B2.2312554 - Pubmed
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7. Hanson J, Kapron A, Swenson K, Maak T, Peters C, Aoki S. Discrepancies in Measuring Acetabular Coverage: Revisiting the Anterior and Lateral Center Edge Angles. J Hip Preserv Surg. 2015;2(3):280-6. doi:10.1093/jhps/hnv041 - Pubmed
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8. Welton K, Jesse M, Kraeutler M, Garabekyan T, Mei-Dan O. The Anteroposterior Pelvic Radiograph. J Bone Joint Surg. 2018;100(1):76-85. doi:10.2106/jbjs.17.00500 - Pubmed
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9. Wiberg G. Studies on Dysplastic Acetabula and Congenital Subluxation of the Hip Joint with Special Reference to the Complication of Osteo-Arthritis. JAMA. 1940;115(1):81. doi:10.1001/jama.1940.02810270083038
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10. Bauer G. Gunnar Wiberg 1902–1988. Acta Orthop Scand. 1988;59(6):732-7. doi:10.3109/17453678809149439 - Pubmed
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