Akrami Mohammad, Craig Kim, Dibaj Mahdieh, Javadi Akbar A, Benattayallah Abdelmalek
a Department of Engineering, College of Engineering , Mathematics, and Physical Sciences, University of Exeter , Exeter , UK.
b MR Research Centre , University of Exeter , Exeter , UK.
J Med Eng Technol. 2018 Oct;42(7):546-552. doi: 10.1080/03091902.2019.1576795. Epub 2019 Mar 15.
A three-dimensional hip model was created from the MRI scans of one human subject based on constructing the entire pelvis and femur. The ball and socket joint was modelled between the hip's acetabulum and the femoral head to analyse the multiaxial loads applied in the hip joint. The three key ligaments that reinforce the external surface of the hip to help to stabilise the joint were also modelled which are the iliofemoral, the pubofemoral and ischiofemoral ligaments. Each of these ligaments wraps around the joint connection to form a seal over the synovial membrane, a line of attachment around the head of the femur. This model was tested for different loading and boundary conditions to analyse their sensitivities on the cortical and cancellous tissues of the human hip bones. The outcomes of a one-legged stance finite element analysis revealed that the maximum of 0.056 mm displacement occurred. The stress distribution varied across the model which the majority occurring in the cortical femur and dissipating through the cartilage. The maximum stress value occurring in the joint was 110.1 MPa, which appeared at the free end of the proximal femur. This developed finite element model was validated against the literature data to be used as an asset for further research in investigating new methods of total hip arthroplasty, to minimise the recurrence of dislocations and discomfort in the hip joint, as well as increasing the range of movement available to a patient after surgery.
基于构建整个人体骨盆和股骨，从一名人类受试者的MRI扫描数据创建了一个三维髋关节模型。在髋关节的髋臼和股骨头之间对球窝关节进行建模，以分析髋关节所承受的多轴负荷。还对加强髋关节外表面以帮助稳定关节的三条关键韧带进行了建模，即髂股韧带、耻骨股韧带和坐骨股韧带。这些韧带中的每一条都环绕关节连接，在滑膜上方形成一个密封，滑膜是围绕股骨头的附着线。对该模型进行了不同加载和边界条件的测试，以分析它们对人体髋骨皮质和松质组织的敏感性。单腿站立有限元分析的结果显示，最大位移为0.056毫米。应力分布在整个模型中各不相同，大部分应力出现在股骨皮质，并通过软骨消散。关节中出现的最大应力值为110.1兆帕，出现在股骨近端的自由端。这个开发的有限元模型根据文献数据进行了验证，可作为进一步研究全髋关节置换新方法的资产，以尽量减少髋关节脱位和不适的复发，并增加患者术后的活动范围。
