Do normal radiographs exclude asphericity of the femoral head-neck junction?

Dudda, M; Albers, C; Mamisch, TC; Werlen, S; Beck, M (2009). Do normal radiographs exclude asphericity of the femoral head-neck junction? Clinical orthopaedics and related research, 467(3), pp. 651-9. Heidelberg: Springer-Verlag 10.1007/s11999-008-0617-5

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Asphericity of the femoral head-neck junction is one cause for femoroacetabular impingement of the hip. However, the asphericity often is underestimated on conventional radiographs. This study compares the presence of asphericity on conventional radiographs with its appearance on radial slices of magnetic resonance arthrography (MRA). We retrospectively reviewed 58 selected hips in 148 patients who underwent a surgical dislocation of the hip. To assess the circumference of the proximal femur, alpha angle and height of asphericity were measured in 14 positions using radial slices of MRA. The hips were assigned to one of four groups depending on the appearance of the head-neck junction on anteroposterior pelvic and lateral crosstable radiographs. Group I (n = 19) was circular on both planes, Group II (n = 19) was aspheric on the crosstable view, Group III (n = 4) was aspheric on the anteroposterior view, and Group IV (n = 13) was aspheric on both views. In all four groups, the highest alpha angle was found in the anterosuperior area of the head-neck junction. Even when conventional radiographs appeared normal, an increased alpha angle was present anterosuperiorly. Without the use of radial slices in MRA, the asphericity would be underestimated in these patients.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Orthopaedic, Plastic and Hand Surgery (DOPH) > Clinic of Orthopaedic Surgery

UniBE Contributor:

Dudda, Marcel; Albers, Christoph; Mamisch, Tallal Charles and Beck, Martin

ISSN:

0009-921X

ISBN:

19023635

Publisher:

Springer-Verlag

Language:

English

Submitter:

Factscience Import

Date Deposited:

04 Oct 2013 15:09

Last Modified:

23 Oct 2019 08:30

Publisher DOI:

10.1007/s11999-008-0617-5

PubMed ID:

19023635

Web of Science ID:

000263070900008

BORIS DOI:

10.7892/boris.30359

URI:

https://boris.unibe.ch/id/eprint/30359 (FactScience: 192922)

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