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ARUP; ISBN: 978-0-9562121-5-3 - CMBBE 2012 - Cardiff University

ARUP; ISBN: 978-0-9562121-5-3 - CMBBE 2012 - Cardiff University

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Fig. 4: Correlation of the location (superior region of actebulum rim) of computed stress<br />

peaks and observed lesions.<br />

5. DISCUSSION AND CONCLUSION<br />

The correlation of the simulation results and medical analysis shows a relation between<br />

the location of high stresses and lesions. Moreover, no morphological abnormalities<br />

have been observed by radiologists in the subject's hip joint. Therefore, we can say that<br />

the detected lesions are not the result of a morphological problem but of an idiopathic<br />

OA. To investigate the causes of these lesions, we suspect that it can be explained by<br />

the nature of extreme and repetitive movements practiced by the subject during her<br />

daily exercises. However, additional work is necessary to accept this assumption by<br />

evaluating more accurately the biomechanical model elements and by extending the<br />

analysis for more subjects.<br />

ACKNOWLEDGMENT<br />

This work is supported by the Swiss National Research Foundation (project 200020-<br />

132584/1). We are grateful to the <strong>University</strong> Hospital of Geneva and the ballet dancers<br />

of the great theater of Geneva for their collaboration.<br />

REFERENCES<br />

1. Chegini S., Beck M. and Ferguson S., The effects of impingement and dysplasia on<br />

stress distributions in the hip joint during sitting and walking: A finite element<br />

analysis, J. Orthop. Res., 2008, Vol. 27, 195-201.<br />

2. Anderson A. E., Ellis B. J., Maas S., Peters C. L., and Weiss J., Validation of finite<br />

element predictions of cartilage contact pressure in the human hip joint, J. Biomech.<br />

Eng., 2008, Vol. 130, 1–10.<br />

3. Kress I., Siebenrock K., Werlen S. and Mamisch T., Sports-related alterations of the<br />

hip joint and correlation to typical findings in femoroacetabular impingement: Mr<br />

findings in 50 elite karate fighters, In European Congress on Radiology, 2009.Vol.<br />

19, 64.<br />

4. Pfirrmann C., Mengiardi B., Dora C., Kalberer F., Zanetti M. and Hodler J., Cam<br />

and pincer femoroacetabular impingement: Characteristic mr arthrographic findings<br />

in 50 patients, J. Radiol., 2006, Vol. 240, 778–785.

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