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European Radiology

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01-07-2017 | Magnetic Resonance

Bony morphology of the hip in professional ballet dancers compared to athletes

Authors: Susan Mayes, April-Rose Ferris, Peter Smith, Andrew Garnham, Jill Cook

Published in: European Radiology | Issue 7/2017

Abstract

Objectives

To compare hip bony morphology between ballet dancers and a sporting control group and to determine the relationship with hip pain.

Methods

Thirty-three professional ballet dancers and 33 age- and sex-matched athletes completed questionnaires, including the Copenhagen Hip and Groin Outcome Score (HAGOS), and underwent clinical testing and 3.0-T magnetic resonance imaging to measure acetabular coverage with lateral centre edge angles, femoral head-neck junction concavity with alpha angles at anterior and superior positions, femoral neck-shaft angles, and acetabular version angles.

Results

Bony morphological measures fell within normal ranges. Dancers had higher neck-shaft angles (dancers 134.6 ± 4.6°/athletes130.8 ± 4.7°, p = 0.002), lower acetabular version angles (13.5 ± 4.7°/17.1 ± 4.7°, p = 0.003), lower superior alpha angles (38.9 ± 6.9°/46.7 ± 10.6°, p < 0.001), similar anterior alpha angles (43.6 ± 8.1/46 ± 7°, p = 0.2), and similar lateral centre edge angles (28.8 ± 4.6°/30.8 ± 4.5°, p = 0.07) compared to athletes. Abnormal morphology was detected in dancers: 3% acetabular dysplasia (athletes 0), 15% borderline dysplasia (6%), 24% cam morphology (33%), 24% coxa valga (6%), and 21% acetabular retroversion (18%). The HAGOS pain scores correlated moderately with acetabular version (r = -0.43, p = 0.02) in dancers, with no other correlation between pain and morphological parameters in either group.

Conclusions

Professional ballet dancers have hip bony morphology that differentiates them from athletes. Hip pain correlated poorly with bony morphology.

Key points

• Ballet dancers have hip bony morphology that may allow extreme hip motion.

• Morphological parameter means fell within normal reference intervals in dancers.

• Bony morphology correlates poorly with hip pain.

• The risk of hip injury due to abnormal morphology requires prospective studies.

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Title: Bony morphology of the hip in professional ballet dancers compared to athletes
Authors: Susan Mayes
April-Rose Ferris
Peter Smith
Andrew Garnham
Jill Cook
Publication date: 01-07-2017
Publisher: Springer Berlin Heidelberg
Published in: European Radiology / Issue 7/2017
Print ISSN: 0938-7994
Electronic ISSN: 1432-1084
DOI: https://doi.org/10.1007/s00330-016-4667-x

At a glance: The STEP trials

Springer Medicine

Bony morphology of the hip in professional ballet dancers compared to athletes

Abstract

Objectives

Methods

Results

Conclusions

Key points

At a glance: The STEP trials

Springer Medicine

Abstract

Objectives

Methods

Results

Conclusions

Key points

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