EFFECTS OF ROTATIONAL ELLIPSOIDAL ACETABULAR CARTILAGE SURFACES AXIS LENGTH RATIO ON THE CONTACT STRESS IN THE HIP

摘要：

The acetabular cartilage plays an important role in hip joint biomechanics and many reports focusing on its geometric morphometry have been made, but few studies have done some sensitivity analysis to figure out the impacts of geometric shape parameters on hip contact stress.This paper aims to elucidate how the length ratio of the rotational ellipsoidal acetabular cartilage surfaces major axis to minor one (ALR) affects the contact stress in the hip, via analyzing finite element (FE) models of hip mechanics with varying ALR.By using the reverse engineering technique and surface-fitting algorithms, 11 best-fit rotational ellipsoidal surfaces of the point clouds from a volunteers right acetabular articular surface with different ALR (from 1.00 to 1.20) were created.The contact stress between a sphere (femoral head surface) and 11 best-fit rotational ellipsoids (acetabular cartilage surfaces) with a hip contact force (Bergmann et al..2001) applied on femoral head centre was calculated, via FE analysis technology and the ANSYS software.As the ALR grew from 1.00, it was found that the surface fitting error of this specimen decreased to reach its minimum at 1.156 (23.9％ lower than standard sphere), and then increased gradually.A similar trend was observed from the corresponding contact stress results.These results support the idea that the more the model geometry morphometry is similar to the natural human articular surface, the more excellent mechanical properties it tends to own.

关键词： Rotational ellipsoid Acetabular Axis length ratio Contact stress

作者: MENG XIANG-JIE GE SHI-RONG HAN SHU-YANG

作者单位: College of Mechanical and Electrical Engineering,China University of Mining and Technology,Xuzhou,China

会议类型: 国际会议

会议名称: 3rd International Conference on Mechanical and Electrical Technology(ICMET2011) (2011第三届机械与电气技术国际会议)

会议地点: 大连

会议语种:英文

页码: 705-711

在线出版日期: 2011-08-26（万方平台首次上网日期，不代表论文的发表时间）