There have been few reports on fixation of Rommens classification Type IIIA fragility fractures of the pelvis (FFPs). Here, we present our less invasive surgical technique, called iliac intramedullary stabilization (ILIS), for the internal fixation of Type IIIA FFPs. The technique involves a closed reduction, termed the femur internal rotation reduction method (FIRM), whereby the fracture fragments are repositioned using lateral rotators by internally rotating the femur while the patient is in the prone position. Two iliac screws are inserted on the ilium bilaterally via the supra-acetabular bone canal during FIRM and connected with two transverse rods and two cross connectors. We refer to this internal fixation procedure as ILIS. We retrospectively recruited patients with Type IIIA fractures, treated using this procedure, at our institute between October 2017 and October 2019. We evaluated operative and post-operative outcomes. We enrolled 10 patients (9 women and 1 man; mean age, 85.2 years) who were followed up for over 6 months. All patients suffered FFPs after falling from a standing position. The mean operative time was 145.1 (range, 94–217) minutes, and the mean blood loss was 258.5 (range, 100–684) ml. All patients were allowed full weight bearing from post-operative day 1. All patients achieved bone union and regained their pre-injury walking ability at 6 months after surgery without evident secondary displacement. In conclusion, our ILIS technique allows less invasive internal fixation of Type IIIA FFPs with adequate stability for full weight bearing from post-operative day 1.

目前关于 Rommens 分类 IIIA 型骨盆脆性骨折（FFP）的固定报道很少。在这里，我们介绍一种微创手术技术，称为髂髓内稳定 (ILIS)，用于 IIIA 型 FFP 的内固定。该技术涉及闭合复位，称为股骨内旋复位法（FIRM），在患者处于俯卧位时，使用侧向旋转器通过内旋股骨来重新定位骨折碎片。 FIRM 期间，通过髋臼上骨管将两个髂骨螺钉插入两侧髂骨上，并与两个横杆和两个十字连接器连接。我们将此内部固定程序称为 ILIS。我们回顾性招募了 2017 年 10 月至 2019 年 10 月期间在我们研究所接受该手术治疗的 IIIA 型骨折患者。我们评估了手术和术后结果。我们招募了 10 名患者（9 名女性和 1 名男性；平均年龄 85.2 岁），并对他们进行了超过 6 个月的随访。所有患者从站立位置跌倒后均出现 FFP。平均手术时间为 145.1 分钟（范围为 94-217）分钟，平均失血量为 258.5 毫升（范围为 100-684）ml。所有患者从术后第1天起即可完全负重。所有患者均在术后6个月达到骨愈合并恢复伤前行走能力，无明显继发移位。总之，我们的 ILIS 技术可以对 IIIA 型 FFP 进行侵入性较小的内固定，并具有足够的稳定性，可以从术后第一天起完全承重。