Comparative Evaluation of Cross-table and Ducroquet Incidences for Measurement of the Hip Alpha Angle

Polesello, Giancarlo Cavalli; Queiroz, Marcelo Cavalheiro; Ricioli, Walter; Rudelli, Marco; Nunes, Marcus Aurelius Araújo; Amaral, Denise Tokechi

doi:10.1055/s-0039-1693044

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Revista Brasileira de Ortopedia

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Original Article • Rev. bras. ortop. 54 (04) • Jul-Aug 2019 • https://doi.org/10.1055/s-0039-1693044 copy

Comparative Evaluation of Cross-table and Ducroquet Incidences for Measurement of the Hip Alpha Angle^* * Work performed at the Hip Group, Orthopedics and Traumatology Department, Irmandade Santa Casa de Misericórdia, Faculdade de Ciências Médicas da Santa Casa de São Paulo (FCMSCSP), São Paulo, SP, Brazil.

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

Objective

The purpose of the present paper is to compare the equivalence of the measurement of the alpha angle using the Ducroquet and cross-table lateral views.

Methods

We have recruited 90 patients, resulting in 95 hips. We have standardized the realization of the radiographic views. The incidence of the lateral cross-table views were takenwith 15° of internal rotation with the patient in the supine position, and the incidence of the Ducroquet viewswas standardizedwith the patient in the supine position,with 90° of flexion and 45° of abduction of the hip. The alpha angle wasmeasured in both lateral views, by two musculoskeletal radiologists. The measurements were performed in 2 different times: an initial evaluation andanother 4weeks afterwards. The t Student test was usedand calculated the intraclass correlation coefficient (ICC).

Results

We have found a good intraobserver correlation for both views in different times; there was no statistically significant difference between the measurements performed by the two views. However, the interobserver correlation was low.

Conclusion

In conclusion, the Ducroquet profile view is a good choice for the α angle measurement and can be used instead of the cross-table view.

Keywords:
femoroacetabular impingement; hip/abnormalities; hip/diagnostic imaging; radiography

Observer	Radiographic View	Time	Mean (°) ± SD	Median (°)
1	Cross-Table	pre	49.8 ± 7.43	50.1
		post	49 ± 7.31	48.5
1	Ducroquet	pre	50.2 ± 8.32	49.8
		post	48 ± 7.89	48.2
2	Cross-Table	pre	44.9 ± 9.77	42.3
		post	45.4 ± 8.68	45.5
2	Ducroquet	pre	45.2 ± 9.22	45.2
		post	44.9 ± 7.88	44.4

Analysis	Intraclass Correlation Coefficients	95%CI
CT Obs1 (pre) x CT Obs2 (pre)	0.588	0.381–0.726
CT Obs1 (post) x CT Obs2 (post)	0.653	0.397–0.790
DC Obs1 (pre) x DC Obs2 (pre)	0.578	0.226–0.754
DC Obs1 (post) x DC Obs2 (post)	0.718	0.405–0.847
CT Obs1 (pre) x DC Obs1 (pre)	0.938	0.907–0.959
CT Obs1 (post) x DC Obs1 (post)	0.969	0.954–0.979
CT Obs2 (pre) x DC Obs2 (pre)	0.862	0.793–0.908
CT Obs2 (post) x DC Obs2 (post)	0.945	0.918–0.964

Analysis		p-value
1	Cross-table (Obs1 pre) – Ducrocquet (Obs1 pre)	0.309
2	Cross-table (Obs2 pre) – Ducrocquet (Obs2 pre)	0.611
3	Cross-table (Obs1 post) – Ducrocquet (Obs1 post)	0.699
4	Cross-table (Obs2 post) – Ducrocquet (Obs2 post)	0.223

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E-mail: rbo@sbot.org.br

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[1] Address for correspondence
Giancarlo Cavalli Polesello, MD, PhD, Rua Dr. Cesário Mota Júnior, 112, Bairro Vila Buarque, São Paulo, SP, 01221-020, Brazil (e-mail: dot.quadril@hotmail.com).