Ghosh Rajesh, Pal Bidyut, Ghosh Debatri, Gupta Sanjay
a Department of Mechanical Engineering , Indian Institute of Technology Kharagpur , Kharagpur 721 302 , West Bengal , India.
Comput Methods Biomech Biomed Engin. 2015;18(7):697-710. doi: 10.1080/10255842.2013.843674. Epub 2013 Oct 24.
An appropriate method of application of the hip-joint force and stress analysis of the pelvic bone, in particular the acetabulum, is necessary to investigate the changes in load transfer due to implantation and to calculate the reference stimulus for bone remodelling simulations. The purpose of the study is to develop a realistic 3D finite element (FE) model of the hemi-pelvis and to assess stress and strain distribution during a gait cycle. The FE modelling approach of the pelvic bone was based on CT scan data and image segmentation of cortical and cancellous bone boundaries. Application of hip-joint force through an anatomical femoral head having a cartilage layer was found to be more appropriate than a perfectly spherical head, thereby leading to more accurate stress-strain distribution in the acetabulum. Within the acetabulum, equivalent strains varied between 0.1% and 0.7% strain in the cancellous bone. High compressive (15-30 MPa) and low tensile (0-5 MPa) stresses were generated within the acetabulum. The hip-joint force is predominantly transferred from the acetabulum through the lateral cortex to the sacroiliac joint and the pubic symphysis. The study is useful to understand the load transfer within the acetabulum and for further investigations on acetabular prosthesis.
为了研究植入导致的负荷转移变化并计算骨重塑模拟的参考刺激，需要一种合适的施加髋关节力和分析骨盆骨（特别是髋臼）应力的方法。本研究的目的是建立一个逼真的半骨盆三维有限元（FE）模型，并评估步态周期中的应力和应变分布。骨盆骨的有限元建模方法基于CT扫描数据以及皮质骨和松质骨边界的图像分割。通过具有软骨层的解剖学股骨头施加髋关节力比完美球形头更合适，从而在髋臼中产生更准确的应力 - 应变分布。在髋臼内，松质骨中的等效应变在0.1%至0.7%应变之间变化。髋臼内产生高压缩应力（15 - 30MPa）和低拉伸应力（0 - 5MPa）。髋关节力主要从髋臼通过外侧皮质转移到骶髂关节和耻骨联合。该研究有助于理解髋臼内的负荷转移，并用于髋臼假体的进一步研究。
