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Revista Brasileira de Ortopedia

Print version ISSN 0102-3616On-line version ISSN 1982-4378


POLESELLO, Giancarlo Cavalli et al. Comparative Evaluation of Cross-table and Ducroquet Incidences for Measurement of the Hip Alpha Angle. Rev. bras. ortop. [online]. 2019, vol.54, n.4, pp.428-433.  Epub Oct 07, 2019. ISSN 0102-3616.


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.


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).


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.


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.

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