Role of the acetabular labrum in load support across the hip joint

被引:144
作者
Henak, Corinne R. [1 ,2 ]
Ellis, Benjamin J. [1 ,2 ]
Harris, Michael D. [1 ,2 ,3 ]
Anderson, Andrew E. [1 ,2 ,3 ]
Peters, Christopher L. [3 ]
Weiss, Jeffrey A. [1 ,2 ,3 ]
机构
[1] Univ Utah, Dept Bioengn, Salt Lake City, UT 84112 USA
[2] Univ Utah, Sci Comp & Imaging Inst, Salt Lake City, UT 84112 USA
[3] Univ Utah, Dept Orthopaed, Salt Lake City, UT 84108 USA
关键词
Acetabular labrum; Hip; Cartilage mechanics; Finite element; Dysplasia; FINITE-ELEMENT-ANALYSIS; SYNOVIAL-FLUID; CLINICAL PRESENTATION; PRESSURE DISTRIBUTION; BOUNDARY LUBRICATION; CARTILAGE THICKNESS; ARTICULAR-CARTILAGE; TEARS; SEAL; COMPRESSION;
D O I
10.1016/j.jbiomech.2011.06.011
中图分类号
Q6 [生物物理学];
学科分类号
071011 ;
摘要
The relatively high incidence of labral tears among patients presenting with hip pain suggests that the acetabular labrum is often subjected to injurious loading in vivo. However, it is unclear whether the labrum participates in load transfer across the joint during activities of daily living. This study examined the role of the acetabular labrum in load transfer for hips with normal acetabular geometry and acetabular dysplasia using subject-specific finite element analysis. Models were generated from volumetric CT data and analyzed with and without the labrum during activities of daily living. The labrum in the dysplastic model supported 4-11% of the total load transferred across the joint, while the labrum in the normal model supported only 1-2% of the total load. Despite the increased load transferred to the acetabular cartilage in simulations without the labrum, there were minimal differences in cartilage contact stresses. This was because the load supported by the cartilage correlated with the cartilage contact area. A higher percentage of load was transferred to the labrum in the dysplastic model because the femoral head achieved equilibrium near the lateral edge of the acetabulum. The results of this study suggest that the labrum plays a larger role in load transfer and joint stability in hips with acetabular dysplasia than in hips with normal acetabular geometry. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2201 / 2206
页数:6
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