C. R. Henak, C. L. Abraham, A. E. Anderson, S. A. Maas, B. J. Ellis, C

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Date of download: 11/7/2017 Copyright © ASME. All rights reserved.

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Patient-specific analysis of cartilage and labrum mechanics in human hips with acetabular dysplasia C.R. Henak, C.L. Abraham, A.E. Anderson, S.A. Maas, B.J. Ellis, C.L. Peters, J.A. Weiss Osteoarthritis and Cartilage Volume 22, Issue 2, Pages 210-217 (February 2014) DOI: 10.1016/j.joca.2013.11.003 Copyright © 2013 Osteoarthritis Research Society International Terms and Conditions

Fig. 1 Representative model showing the bones in white, the acetabular labrum in green, the acetabular cartilage in blue and the femoral cartilage in yellow. A – whole model. B – sagittal view of the acetabulum, with lines indicating the discretization of the cartilage, labrum and bones. Osteoarthritis and Cartilage 2014 22, 210-217DOI: (10.1016/j.joca.2013.11.003) Copyright © 2013 Osteoarthritis Research Society International Terms and Conditions

Fig. 2 Load supported by the labrum was significantly larger for dysplastic hips than normal hips during all loading scenarios. Error bars indicate upper confidence bounds (at 95%). * indicates P ≤ 0.05 in comparison to normal hips during the same loading scenario (n = 10 in each group). Osteoarthritis and Cartilage 2014 22, 210-217DOI: (10.1016/j.joca.2013.11.003) Copyright © 2013 Osteoarthritis Research Society International Terms and Conditions

Fig. 3 Coronal cross-sectional images of contact stress in a representative normal and a representative dysplastic hip, with the three dimensional bones shown transparent. Lateral loading in the dysplastic hip results in higher contact stress in the acetabular labrum, and thus larger loads (Fig. 2). Osteoarthritis and Cartilage 2014 22, 210-217DOI: (10.1016/j.joca.2013.11.003) Copyright © 2013 Osteoarthritis Research Society International Terms and Conditions

Fig. 4 Contact area on the acetabular labrum. A – anterior region. B – superior region. C – posterior region. Contact area in the superior acetabular labrum was larger in dysplastic hips than in normal hips, but there were no differences in the anterior or posterior regions during the simulated activities. Error bars indicate upper confidence bounds (at 95%). * = P < 0.05 in comparison to normal hips during the same loading scenario (n = 10 in each group). Osteoarthritis and Cartilage 2014 22, 210-217DOI: (10.1016/j.joca.2013.11.003) Copyright © 2013 Osteoarthritis Research Society International Terms and Conditions

Fig. 5 Congruency during WM and AH in all anatomical regions. Smaller values indicate more congruent surfaces. A – most congruent point (minimum RMS value) during WM. B – most congruent point (minimum RMS value) during AH. C – average congruency (average RMS value) during WM. D – average congruency (average RMS value) during AH. Dysplastic hips were significantly less congruent in some unloaded regions. However, there were no significant differences in the primary load-bearing regions. Error bars indicate upper confidence bounds (at 95%). * = P < 0.05 in comparison to normal hips during the same loading scenario (n = 10 in each group). Osteoarthritis and Cartilage 2014 22, 210-217DOI: (10.1016/j.joca.2013.11.003) Copyright © 2013 Osteoarthritis Research Society International Terms and Conditions

Fig. 6 Average contact stress fringe plots during all simulated activities. Qualitative differences in the pattern of contact stress in the two groups can be seen, with more lateral contact and less medial contact in the dysplastic hips than in the normal hips (n = 10 in each group). Osteoarthritis and Cartilage 2014 22, 210-217DOI: (10.1016/j.joca.2013.11.003) Copyright © 2013 Osteoarthritis Research Society International Terms and Conditions

Osteoarthritis and Cartilage 2014 22, 210-217DOI: (10. 1016/j. joca Copyright © 2013 Osteoarthritis Research Society International Terms and Conditions

Osteoarthritis and Cartilage 2014 22, 210-217DOI: (10. 1016/j. joca Copyright © 2013 Osteoarthritis Research Society International Terms and Conditions

Osteoarthritis and Cartilage 2014 22, 210-217DOI: (10. 1016/j. joca Copyright © 2013 Osteoarthritis Research Society International Terms and Conditions

Osteoarthritis and Cartilage 2014 22, 210-217DOI: (10. 1016/j. joca Copyright © 2013 Osteoarthritis Research Society International Terms and Conditions