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European Radiology

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01-01-2011 | Musculoskeletal

Ultrasound for the evaluation of femoroacetabular impingement of the cam type. Diagnostic performance of qualitative criteria and alpha angle measurements

Authors: Florian M. Buck, Juerg Hodler, Marco Zanetti, Claudio Dora, Christian W. A. Pfirrmann

Published in: European Radiology | Issue 1/2011

Abstract

Objective

To develop and assess a technique to evaluate cam type femoroacetabular impingement (FAI) using ultrasound (US).

Methods

Fifty patients (24 women, 26 men) were included (mean age: 39.1 years; age range: 16–59). US images of the anterior and anterosuperior contour of the femoral neck were obtained and analysed in 50 patients. Non-spherical shape of the head-neck junction (cam deformity), bony protuberances at the femoral neck, shape of the femoral neck (waist deficiency) and alpha angle were assessed. Magnetic resonance (MR) arthrography served as the standard of reference. Diagnostic performance and receiver operating characteristics (ROC) curves were calculated.

Results

Based on MR arthrography 28 patients had cam-type FAI. On US, an anterosuperior cam deformity was seen in 40/44 patients (Reader 1/Reader 2; sensitivity 93%/89%, specificity 36%/14%). A bony protuberance anterosuperiorly in 23/13 patients (sensitivity 71%/32%, specificity 86%/82%) and an anterosuperior waist deficiency in 19/35 patients (sensitivity 25%/54%, specificity 100%/54%). Sensitivity and specificity of the other criteria were lower than 70% (average of Reader 1 & 2).

Conclusion

A technique to evaluate cam type FAI using US is presented. The detection of an anterosuperior cam deformity is sensitive, and presence of an anterosuperior bony protuberance is specific for cam FAI. Alpha angle measurements are not helpful in establishing the diagnosis.

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Title: Ultrasound for the evaluation of femoroacetabular impingement of the cam type. Diagnostic performance of qualitative criteria and alpha angle measurements
Authors: Florian M. Buck
Juerg Hodler
Marco Zanetti
Claudio Dora
Christian W. A. Pfirrmann
Publication date: 01-01-2011
Publisher: Springer-Verlag
Published in: European Radiology / Issue 1/2011
Print ISSN: 0938-7994
Electronic ISSN: 1432-1084
DOI: https://doi.org/10.1007/s00330-010-1900-x

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Ultrasound for the evaluation of femoroacetabular impingement of the cam type. Diagnostic performance of qualitative criteria and alpha angle measurements

Abstract

Objective

Methods

Results

Conclusion

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Objective

Methods

Results

Conclusion

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