dc.creatorBarrientos, Cristián
dc.creatorBarahona Vásquez, Maximiliano
dc.creatorDíaz, Jorge
dc.creatorBrañes Fierro, Julián
dc.creatorChaparro Ravazzano, Felipe
dc.creatorHinzpeter Cohen, Jaime
dc.date.accessioned2017-11-23T15:06:26Z
dc.date.accessioned2019-04-26T01:23:12Z
dc.date.available2017-11-23T15:06:26Z
dc.date.available2019-04-26T01:23:12Z
dc.date.created2017-11-23T15:06:26Z
dc.date.issued2016
dc.identifierJournal of Hip Preservation Surgery Vol. 3, No. 3, pp. 223–228
dc.identifier10.1093/jhps/hnw014
dc.identifierhttp://repositorio.uchile.cl/handle/2250/145787
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/2449854
dc.description.abstractThe normal value of alpha angle is controversial. The aim of this study was to compare the alpha angle in asymptomatic volunteers versus patients who had undergone surgery for symptomatic cam-type femoroacetabular impingement (FAI) and determine a diagnostic cut-off value for symptomatic cam impingement. This is a diagnostic test study. Cases were defined as those patients who had undergone surgery for symptomatic cam or mixed type FAI. Controls were defined as asymptomatic volunteers, with no history of hip pain who had undergone a computed tomography (CT) scan of the abdomen and pelvis for a non-joint or bone-related reason. In both groups, the alpha angle was measured in an oblique axial CT reconstruction of the femoral neck. A logistic regression model was first estimated and a receiver operating characteristics (ROC) curve was then calculated. The diagnostic cut-off value selected was the one that maximizes sensitivity and specificity. Data were analysed from 38 consecutive cases of cam or mixed FAI and 101 controls. The average alpha angle was 67 degrees (+/- 12 degrees) among cases and 48 degrees degrees(+/- 5 degrees) among controls. An odds ratio of 1.28 [1.18-1.39] was obtained. A ROC curve of 0.96 [0.93-0.99] was calculated, and using an alpha angle of 57 degrees as the diagnostic cut-off value, provided a sensitivity of 92% and a specificity of 95%. If a patient complains of hip pain and an alpha angle of 57 degrees is found in CT, strongly suggest that cam impingement is causing the pain.
dc.languagees
dc.publisherOxford University Press
dc.rightshttp://creativecommons.org/licenses/by-nc-nd/3.0/cl/
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Chile
dc.sourceJournal of Hip Preservation Surgery
dc.subjectFemoroacetabular impingement
dc.subjectFemoral-Head
dc.subjectAsymptomatic Volunteers
dc.subjectComputed-Tomography
dc.subjectPrevalence
dc.titleIs there a pathological alpha angle for hip impingement? A diagnostic test study
dc.typeArtículos de revistas


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