中文摘要：

目的对髂骨肿瘤Ⅰ型切除后骨盆的应变进行分析。方法选择健康成人尸体骨盆标本6例，按照Ennecking对骨盆肿瘤Ⅰ型切除标准行髂骨大部分切除；双足站立位，0～500N垂直分级载荷下，采用应变片对缺损骨盆关键部位的应变进行检测，并和正常骨盆各对应点的应变值进行对照。结果与正常组比较，缺损骨盆各测点应变变化较大。双侧耻骨上支由正常状态下的压应变变为拉应变。双足站立位，500N垂直载荷下，缺损组骨盆健侧骶1侧块、髂骨弓状线应变值分别为-554．5±251．2及-1105．5±352．7，为正常组的2．86、3．77倍，差异有统计学意义（P〈0．05）。结论建立了人体双足站立位髂骨肿瘤Ⅰ型切除的生物力学模型；髂骨肿瘤Ⅰ型切除后，缺损骨盆健侧应变值增大，传递压应力，耻骨联合区域应变绝对值增大，传递拉应力，必须进行修复重建，以恢复骨盆正常的应力传导功能；电阻应变片法测试骨盆表面应变的方法具有测试方法简单、结果可靠。

英文摘要：

Objective To analyze the pelvic strain behavior after ihac tumor type Ⅰ resection. Methods Six adult cadaveric specimens were tested. The ihac subtotal resection models were established according to Ennecking＇s type Ⅰ resection. The surficial strains of the defect pelvis and intact pelvis were measured using 6 strain gauges attached to the key regions of pelvis including the site of lateral sacral mass,iliac arcuate line and the superior ramus of pubis. Axial loading from the proximal lumbar was applied by MTS load cell in the gradient of 0 N to 500 N in the double feet standing state. Results Big change of the strains was found in the defect pelvis. Compared to the intact pelvis, the remarkable change was the strain values on both side of the superior ramus of pubis, compressive strain altering to tensile strain. In addition, the average strain values on the normal sites of lateral sacral mass （ -554.5 ± 251.2 ） and iliac arcuate line （ - 1105.5 ±352.7） under vertical load of 500 N were enlarged,which were 2.86 times and 3. 77 time of those in the corresponding sites of intact pelvis respectiely. There was significant difference in strain values on two sites between the defect pelvis and the intact pelvis （ P 〈 0.05 ）. Conclusion Biomechanical model of iliac tumor type Ⅰ resection was established. On the normal side of the pelvis which conducts compressive stress, strain values were increased after type Ⅰ resection of the iliac tumor. Strain values were also increased in the region of pubic symphysis, which conducts tensile stress. Essential pelvic reconstruction must be introduced to recover the normal pelvic stress conduction. The strain gauge method is simple and efficient,which can be used extensively in pelvic biomechanical research.