目的 基于一种新型髋关节假体柄设计,分析其在站立、行走、跑步和坐姿多工况下的应力分布差异。方法 基于人体CT数据,建立七组不同柄植入后的髋关节模型,利用有限元分析方法计算多工况下假体柄和股骨应力情况。结果 站立状态下与植入传统假体柄相比,新型假体柄植入后假体柄应力峰值降低23％、股骨应力降低72％。七种假体柄结果显示,假体柄高度为86.5 mm的新型设计最符合患者需求。多工况结果显示患者处于坐姿,柄承受应力最小、使用寿命更长。结论 新建的假体柄有助于延长假体使用寿命、减小骨损伤风险。髋关节假体模型为后期柄的设计及患者术后康复提供科学理论支撑。
Objective Based on the design of a new type of hip prosthesis stem, the stress distribution differences in standing, walking, running and sitting postures were analyzed. Methods Based on human CT data, seven groups of hips joint models with different stems implanted were established, and the finite element analysis method were used to calculate the stress of the prosthetic stem and femur under multiple working conditions. Results Compared with the traditional prosthetic stem in the standing state, the stress peak value of the new prosthetic stem was reduced by 23%, and the femoral stress was reduced by 72％. The results of seven prosthetic stem height of 86.5mm was the most suitable for patients’ needs. The multi-working condition results show that the patient is in a sitting position, the handle bears the least stress and has a longer service life. Conclusions The newly constructed prosthetic stem helps prolong the life of the prosthesis and reduces the risk of bone damage. The created hip prosthesis model provides scientific theoretical support for the design of the later stem and postoperative rehabilitation of patients.