计算机导航内半骨盆肿瘤切除及有限元分析辅助重建

目的 探讨计算机导航骨盆肿瘤精确切除与重建的安全性和有效性,评价有限元力学分析辅助骨盆环结构与力学重建的可行性.方法 2008年12月至2010年6月,采用有限元分析辅助肿瘤切除后的组配式假体设计,并通过计算机导航对12例内半骨盆恶性肿瘤患者行肿瘤切除与重建术.男8例,女4例;年龄25～53岁,平均39.7岁.软骨肉瘤4例,成骨肉瘤2例,Ewing肉瘤2例,恶性纤维组织细胞瘤1例,转移瘤3例(肾癌1例、甲状腺癌1例、乳腺癌1例).Enneking原发恶性肿瘤分期:ⅠA期1例,Ⅰ B期2例,ⅡA期2例,ⅡB期4例.术后评价肿瘤学结果和功能恢复情况.结果 术中未发生神经、血管和脏器损伤.术后X线片显示肿瘤切除范围与术前计划匹配,肿瘤切除彻底,组配式骨盆假体安放位置满意,固定钉位置满足术前有限元力学分析要求.全部病例随访8～26个月,平均18.2个月.肿瘤局部复发并肺转移1例,深部感染1例,深静脉血栓形成1例.无假体脱位及内固定松动、断裂,无肢体短缩.术后6个月时1993年美国骨肿瘤学会功能评分平均70%,6例随访超过20个月的患者功能评分平均68%.结论 计算机导航辅助骨盆肿瘤切除重建是一种安全有效的方法,有限元分析可为骨盆环重建提供精确的力学指导.

Abstract：

Objective To analyze the security and effectiveness of the accurate resection and reconstruction of pelvic tumor with computer navigation and to evaluate the feasibility of pelvic ring structure and mechanics reconstruction using finite element analysis.Methors From December 2008 to June 2010,tumor resections assisted by computer navigation technology and pelvic reconstructions with assembly prosthesis designed by finite element analysis were performed in 12 patients with internal hemi-pelvic malignant tumors.There were 8 male and 4 female patients,with the average age of 39.7 years(range,25-53).The malignant tumors involved chondrosarcoma(4 cases),osteosarcoma(2),Ewing sarcoma(2),malignant fibrohistiocytoma(1),and metastatic tumor(3,in which including renal cell carcinoma 1 case,thyroid carcinoma 1,and breast carcinoma 1).According to Enneking staging classification,there were 1 case in Ⅰ A,2 cases in ⅠB,2 cases in Ⅱ A.and 4 cases in Ⅱ B.The local recurrence of tumor and functional results were followed up postoperatively.Results There were no nerves,vessels and pelvic organs injuries intra-operatively.The postoperative X-rays showed that the excised regions were proper to the preoperative schedule and en bloc resections were performed in all patients.All assembly prostheses were in satisfactory position.and the screw fixation was accordance with the finite element biomechanical analysis.All the cases were followed up for average 18.2 months (range,8-26).There were 1 case with local recurrence and pulmonary metastasis,1 case with deep infection,and 1 case with deep vein thrombosis.No prosthesis dislocation,loosening,breaking,and limb length discrepancy occurred in all patients.The average MSTS93 functional score was 70%in all patients at 6 months,and 68 % in 6 patients at 20 months follow.up.Conclusion The resection and reconstruction of pelvic tumor assisted by computer navigation is a safe and effective procedure.The finite element analysis can provide accurate biomechanical guidance to the reconstruction of pelvic ring.

The resection of internal hemi-pelvic tumor using computer navigation and the reconstruction assisted by finite element analysis

Objective To analyze the security and effectiveness of the accurate resection and reconstruction of pelvic tumor with computer navigation and to evaluate the feasibility of pelvic ring structure and mechanics reconstruction using finite element analysis.Methors From December 2008 to June 2010,tumor resections assisted by computer navigation technology and pelvic reconstructions with assembly prosthesis designed by finite element analysis were performed in 12 patients with internal hemi-pelvic malignant tumors.There were 8 male and 4 female patients,with the average age of 39.7 years(range,25-53).The malignant tumors involved chondrosarcoma(4 cases),osteosarcoma(2),Ewing sarcoma(2),malignant fibrohistiocytoma(1),and metastatic tumor(3,in which including renal cell carcinoma 1 case,thyroid carcinoma 1,and breast carcinoma 1).According to Enneking staging classification,there were 1 case in Ⅰ A,2 cases in ⅠB,2 cases in Ⅱ A.and 4 cases in Ⅱ B.The local recurrence of tumor and functional results were followed up postoperatively.Results There were no nerves,vessels and pelvic organs injuries intra-operatively.The postoperative X-rays showed that the excised regions were proper to the preoperative schedule and en bloc resections were performed in all patients.All assembly prostheses were in satisfactory position.and the screw fixation was accordance with the finite element biomechanical analysis.All the cases were followed up for average 18.2 months (range,8-26).There were 1 case with local recurrence and pulmonary metastasis,1 case with deep infection,and 1 case with deep vein thrombosis.No prosthesis dislocation,loosening,breaking,and limb length discrepancy occurred in all patients.The average MSTS93 functional score was 70%in all patients at 6 months,and 68 % in 6 patients at 20 months follow.up.Conclusion The resection and reconstruction of pelvic tumor assisted by computer navigation is a safe and effective procedure.The finite element analysis can provide accurate biomechanical guidance to the reconstruction of pelvic ring.