Experimental study of an original radiographic view for diagnosis of cam-type anterior femoroacetabular impingement.

International Orthopaedics
E CavaignacJean-Michel Laffosse

Abstract

Primary paraclinical investigation to look for femoral morphological abnormality consistent with cam-type anterior femoroacetabular impingement (FAI) must include specific radiographic projections of the hip from the following: cross-table, frog-leg or Dunn (90° and 45° flexion). We use a frog-leg type view with fixed angles as described by Chiron, obtained with the patient in a supine position, with the hip in 45° flexion-abduction and 30° external rotation. The X-ray beam is anteroposterior and centred on the femoral head. We evaluated this view by comparing it with other views in common use. In this experimental study, we created artificial radio-opaque morphological abnormalities secured onto normal femoral necks. The femurs were placed in relation to a fixed pelvis using orthogonal landmarks, in the positions of the various radiographic views. The digital radiographs were analysed by two observers. Nineteen femurs were included to reveal a difference of 5° between the alpha angle of Nötzli et al. [11] measured on the Dunn view and the frog-leg 45/45/30 view (Student's paired test). The highest mean values of the alpha angle of Nötzli were always obtained with the frog-leg 45/45/30 view (87.4°, 86.2°, 84.5°) and the lowest ...Continue Reading

References

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Citations

Jan 30, 2013·International Orthopaedics·Philippe ChironJean-Michel Laffosse
Mar 5, 2013·International Orthopaedics·Solveig LerchOliver Rühmann
Apr 2, 2014·International Orthopaedics·Zeiad Alshameeri, Vikas Khanduja
Apr 6, 2013·European Journal of Orthopaedic Surgery & Traumatology : Orthopédie Traumatologie·Régis PailhéPhilippe Chiron
Dec 3, 2014·Orthopaedics & Traumatology, Surgery & Research : OTSR·A EspiéP Chiron
Jul 2, 2015·International Orthopaedics·Aloїs EspiéBenoit Chaput
May 7, 2014·Orthopaedics & Traumatology, Surgery & Research : OTSR·G-A OdriF Gouin
Feb 24, 2015·Arthroscopy : the Journal of Arthroscopic & Related Surgery : Official Publication of the Arthroscopy Association of North America and the International Arthroscopy Association·Shinya YamasakiHiroaki Nakamura
Jun 26, 2013·Orthopaedics & Traumatology, Surgery & Research : OTSR·J MurgierB Lepage
Sep 26, 2013·Orthopaedics & Traumatology, Surgery & Research : OTSR·J MurgierP Chiron
Jul 14, 2016·Archives of Orthopaedic and Trauma Surgery·Solveig LerchOliver Rühmann
Oct 17, 2016·Orthopaedics & Traumatology, Surgery & Research : OTSR·A DanginN Bonin

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