Hip chondrolabral mechanics during activities of daily living: Role of the labrum and interstitial fluid pressurization

JOURNAL OF BIOMECHANICS

卷:69

Article

Todd, Jocelyn N.^1,2  Maak, Travis G.³  Ateshian, Gerard A.⁴  Maas, Steve A.^1,2  Weiss, Jeffrey A.^1,2,3 

[1] Univ Utah, Dept Bioengn, 72 South Cent Campus Dr,Room 3750, Salt Lake City, UT 84112 USA

[2] Univ Utah, Sci Comp & Imaging Inst, Salt Lake City, UT 84112 USA

[3] Univ Utah, Dept Orthoped, Salt Lake City, UT 84108 USA

[4] Columbia Univ, Dept Mech Engn, New York, NY 10027 USA

关键词: Hip;    Cartilage mechanics;    Labrum;    Biphasic;    Finite element;   

DOI  :  10.1016/j.jbiomech.2018.01.001

来源: Elsevier

【 摘 要 】

Osteoarthritis of the hip can result from mechanical factors, which can be studied using finite element (FE) analysis. FE studies of the hip often assume there is no significant loss of fluid pressurization in the articular cartilage during simulated activities and approximate the material as incompressible and elastic. This study examined the conditions under which interstitial fluid load support remains sustained during physiological motions, as well as the role of the labrum in maintaining fluid load support and the effect of its presence on the solid phase of the surrounding cartilage. We found that dynamic motions of gait and squatting maintained consistent fluid load support between cycles, while static single-leg stance experienced slight fluid depressurization with significant reduction of solid phase stress and strain. Presence of the labrum did not significantly influence fluid load support within the articular cartilage, but prevented deformation at the cartilage edge, leading to lower stress and strain conditions in the cartilage. A morphologically accurate representation of collagen fibril orientation through the thickness of the articular cartilage was not necessary to predict fluid load support. However, comparison with simplified fibril reinforcement underscored the physiological importance. The results of this study demonstrate that an elastic incompressible material approximation is reasonable for modeling a limited number of cyclic motions of gait and squatting without significant loss of accuracy, but is not appropriate for static motions or numerous repeated motions. Additionally, effects seen from removal of the labrum motivate evaluation of labral reattachment strategies in the context of labral repair. (C) 2018 Elsevier Ltd. All rights reserved.

【 授权许可】

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