中文摘要：

目的 针对半骨盆假体发展中的标准化问题，建立Ⅰ＋Ⅱ＋Ⅲ型标准半骨盆假体模型，对受损骨盆进行骨盆环重建，并进行生物力学研究，以评价其力学响应特点。方法 使用有限元方法模拟人体骨盆在单腿站立时的受力情况。所使用的骨盆模型包含相关关节软骨和韧带，以模拟真实体内环境。结果 在单腿站立姿态载荷作用下，重建骨盆中应力分布与健康骨盆相似，应力均从S1面经由骶髂关节向下传递；骨与假体应力峰值低于材料的屈服极限。结论 Ⅰ＋Ⅱ＋Ⅲ型标准半骨盆假体能够可靠地恢复受损骨盆的功能，研究结果为该种假体在使用中的力学可靠性提供初步的理论依据。

英文摘要：

Objective Aiming at the standardization of hemipelvic prosthesis used in pelvis reconstruction, a type Ⅰ＋Ⅱ＋Ⅲ standard hemipelvic prosthesis was established for biomechanical study and to evaluate its biomechani- cal performance. Methods The finite element method was used to simulate the load applied on the pelvis under single-leg standing stance. The related articular cartilages and ligaments were also included in the pelvis models to simulate the real circumstance in vivo. Results The stress distribution on reconstructed pelvis was found similar to that in natural pelvis under the single-leg loading, which transmitted from S1 to sacro-iliac joint and then continued downwards. The peak values of stresses in the bone and prosthesis were below the yield strength of the relative material. Conclusions The established type Ⅰ＋Ⅱ＋Ⅲ standard hemipelvic prosthesis can reliably make the function of damaged pelvis recover. The research finding provides some primary theoretical reference for mechanical reliability of such prosthesis.