Centre for Biomedical Engineering Transportation Research Alliance, Universiti Teknologi Malaysia, Skudai, Johor, Malaysia.
BMC Musculoskelet Disord. 2014 Feb 3;15:30. doi: 10.1186/1471-2474-15-30.
Minimal available information concerning hip morphology is the motivation for several researchers to study the difference between Asian and Western populations. Current use of a universal hip stem of variable size is not the best option for all femur types. This present study proposed a new design process of the cementless femoral stem using a three dimensional model which provided more information and accurate analysis compared to conventional methods.
This complete design cycle began with morphological analysis, followed by femoral stem design, fit and fill analysis, and nonlinear finite element analysis (FEA). Various femur parameters for periosteal and endosteal canal diameters are measured from the osteotomy level to 150 mm below to determine the isthmus position.
The results showed better total fit (53.7%) and fill (76.7%) canal, with more load distributed proximally to prevent stress shielding at calcar region. The stem demonstrated lower displacement and micromotion (less than 40 μm) promoting osseointegration between the stem-bone and providing primary fixation stability.
This new design process could be used as a preclinical assessment tool and will shorten the design cycle by identifying the major steps which must be taken while designing the femoral stem.
由于对髋部形态学的了解有限，一些研究人员开始研究亚洲人和西方人群之间的差异。目前，使用大小可变的通用髋骨柄并不是所有股骨类型的最佳选择。本研究提出了一种新的无水泥股骨柄设计过程，使用三维模型提供了比传统方法更多的信息和更准确的分析。
这个完整的设计周期从形态分析开始，然后是股骨柄设计、适配和填充分析，以及非线性有限元分析（FEA）。从截骨水平到 150 毫米以下，测量各种股骨参数的骨皮质和骨内膜管直径，以确定峡部位置。
结果表明，更好的总适配（53.7%）和填充（76.7%）管腔，更多的负载分布在近端，以防止在 calcar 区域的应力屏蔽。该柄显示出较低的位移和微动（小于 40 μm），促进了柄骨之间的骨整合，并提供了初步的固定稳定性。
这种新的设计过程可以作为临床前评估工具，通过确定设计股骨柄时必须采取的主要步骤，缩短设计周期。
