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目的:个体化设计及制作3D打印下肢假体，探讨其重建下肢恶性骨肿瘤切除后大段骨缺损的可行性并评估短期临床疗效。方法:收集2017年1月至2019年5月6例于我院就诊并治疗的下肢恶性骨肿瘤患者资料，其中男3例，女3例；年龄（8.67±1.11）岁（范围：6~11岁）。6例均为原发性骨肿瘤，Enneking分期均为ⅡB，其中左胫骨肿瘤3例，右胫骨肿瘤2例，右股骨肿瘤1例。结合术前影像学数据个体化设计3D打印假体，采用三维有限元分析对假体的的力学性能进行评估。于肿瘤切除后，将3D打印假体进行安装固定以重建下肢大段骨缺损。术后定期对患者进行临床随访及影像学评估。使用国际骨骼肌肉肿瘤保肢功能评分系统（Musculoskeletal Tumor Society，MSTS）对肢体的功能状态进行评估，并详细记录肿瘤学结果和假体并发症。结果:6例均顺利完成手术，3例行左胫骨肿瘤切除手术，2例行右胫骨肿瘤切除手术，1例行右股骨肿瘤切除手术，肿瘤切除后骨缺损长度（18.19±3.74）cm，平均手术时间（165.83±54.17）min，平均术中出血（233.33±133.33）ml。有限元分析数据显示：假体整体应力低于相应材料的最大力学强度；3D打印假体与切除缺损匹配良好，符合预期效果。术后平均随访（16.83±7.17）个月。至末次随访，6例均存活且无肿瘤复发及转移；术后各次随访中所有假体稳定，未发生假体周围感染、无菌性松动、假体断裂等并发症，影像学检查可见假体断端与骨整合良好。末次随访时6例下肢功能MSTS评分83.67%±9.11%。结论:个体化设计3D打印假体重建下肢骨肿瘤切除后大段骨缺损，可获得满意的短期临床疗效。“,”Objective:To design 3D printed prosthesis in an individualized way and explore the short-term clinical efficacy of reconstruction of segmental defect after resection of bone tumor in lower extremities with 3D-printed prosthesis.Methods:From January 2017 to June 2019, 6 patients with lower limb bone tumor who met the inclusion criteria were recruited, including 3 males and 3 females, aged 8.67±1.11 years (range 6-11 years). All 6 cases were primary bone tumors, and the Enneking stages were all IIB, including 3 cases of left tibial tumors, 2 cases of right tibial tumors, and 1 case of right femoral tumor. These 3D-printed prostheses were designed based on the preoperative imaging data. The mechanical stability of the prosthesis was evaluated by three-dimensional finite element analysis. After tumor resection, the 3D-printed prosthesis was installed and fixed to reconstruct the segmental bone defect. All patients were clinically followed up and evaluated by imaging regularly after operation. The functional status was assessed by the Musculoskeletal Tumor Society (MSTS) score. Oncology results and complications were recorded in detail.Results:All operations were successfully performed, including 3 cases underwent left tibial tumor resection, 2 cases underwent right tibial tumor resection, and 1 case underwent right femoral tumor resection. The length of the bone defect after tumor resection was 18.19±3.74 cm, the average operation time was 165.83±54.17 min, and the average intraoperative bleeding was 233.33±133.33 ml. These finite element analysis data show that the overall stress of these prostheses are lower than the maximum mechanical strength of the corresponding materials. These 3D printed prostheses match well with the excision defect and meet the expected effect. There were no adverse reactions during the operation. The mean follow-up period was 16.83±7.17 months. At the last follow-up, all patients survived without tumor recurrence or metastasis. Postoperative imaging results showed that all the implants were stable without complications such as peripheral infection, aseptic loosening, prosthesis fracture. These 3D-printed prostheses composite resulted in substantial bone integration at follow-up. The average MSTS score was 83.67%±9.11%.Conclusion:The individualized 3D printed prosthesis can be used to reconstruct the bone defect after the resection of osteosarcoma in the lower extremities, and the clinical efficacy was satisfactory in the short-term follow-up.