微波原位灭活联合人工关节假体置换治疗四肢恶性骨肿瘤的疗效分析

 目的 探讨微波原位灭活联合人工假体置换术治疗四肢恶性骨肿瘤（侵袭范围超过骨全长2/3）的可行性。方法 2001年6月至2012年4月对19例侵袭范围超过骨全长2/3的原发恶性骨肿瘤及转移瘤患者采用微波灭活联合假体置换术进行治疗。男12例, 女7例;年龄11~65岁, 平均47岁。原发恶性骨肿瘤11例,转移瘤8例。股骨远端8例、胫骨近端6例、肱骨近端3例、股骨近端2例。术前X线、CT显示骨干皮质破坏小于骨全长的1/3,而MRI显示肿瘤侵袭范围超过骨全长2/3。依据MRI确定截骨范围,定制肿瘤型人工假体。采用常规肿瘤假体置换入路,按广泛切除原则充分显露瘤段骨及软组织肿块。使用铜网保护瘤段骨周围软组织,用2 450 MHz微波将瘤段骨内部加热到50 ℃,持续20 min,按术前测量长度进行截骨,人工关节假体重建,逐层缝合组织及皮肤。结果 手术时间平均100 min,术中失血量平均600 ml。随访10个月~5年,平均2.7年。原发恶性骨肿瘤患者中1例术后出现复发,带瘤生存;2例术后其他部位转移,死亡;余8例随访期间未出现复发或转移。6例转移瘤患者分别于术后5~20个月出现其他部位转移,死亡;2例随访期间未出现原位复发或转移。3例肱骨近端肿瘤患者术后肩关节外展、上举功能受限,其余患者无关节功能受限。结论 微波灭活联合人工假体置换术治疗髓腔内广泛受累的四肢恶性骨肿瘤,能最大限度地保留术后患者的肢体功能。     

股骨上段肿瘤切除后人工假体重建的临床研究

目的探讨肿瘤广泛切除后人工假体置换治疗股骨上段恶性肿瘤的疗效,总结并发症发生情况。方法1998年7月至2005年7月,对81例股骨上段骨肿瘤的患者行广泛切除后人工假体置换,肿瘤类型包括股骨近端转移癌30例,股骨近端原发恶性骨肿瘤39例,股骨上段周围原发恶性软组织肿瘤4例,股骨上段纤维异常增殖症3例,其他5例。9例患者使用了灭活肿瘤骨结合人工假体复合重建缺损,5例患者行异体骨人工关节复合体重建,其余67例患者均使用金属假体。术后功能评价采用MSTS93评分。结果30例骨转移癌患者中,因术后均转往相关肿瘤科室行放、化疗,随访率较低,局部复发率不详,但术后短期关节功能良好。76例（93．8％）患者术后半年MSTS93评分平均在25分以上。51例原发肿瘤患者术后随访1．5～7．0年,平均3．5年。1例患者出现髋脱位;2例患者出现假体迟发感染;2例患者出现假体松动;2例患者发生移植物与宿主骨接合处不愈合;2例患者出现髋臼磨损;3例患者出现髋部疼痛,行走困难;1例患者出现假体的下沉。5例患者在术后0．5～2．0年内发生了局部复发。结论股骨上段恶性骨肿瘤切除后应用人工假体重建骨缺损,并发症较少,可以早期进行康复训练,术后髋关节功能良好,可作为股骨上段恶性骨肿瘤切除后的首选重建方法。     

肢体恶性骨肿瘤及骨转移癌保肢治疗

目的:探讨肢体恶性骨肿瘤及转移癌行瘤段切除假体重建的方法及意义。方法:本组共62例,男38例,女24例;年龄10~72岁,平均28.4岁。原发肢体恶性骨肿瘤41例,其中骨肉瘤19例,骨巨细胞瘤9例,恶性纤维组织细胞瘤8例,浆细胞瘤3例,尤文氏瘤1例,骨血管内皮瘤1例。骨转移癌21例,原发病灶分别为:肺癌9例,胃癌3例,肾癌2例,乳腺癌2例,甲状腺癌1例,颌下腺癌1例,原发灶不明者3例。对62例肢体恶性骨肿瘤及转移癌应用肿瘤段切除并修复重建治疗。方法有:①瘤段切除人工假体置换术;②瘤段切除自体腓骨移植术;③瘤段切除髓内针骨水泥重建术。结果:术后随访5~42个月,平均14.2个月,41例恶性骨肿瘤中,术后无瘤生存21例,死亡4例,7例发生肺转移,3例发生其他部位转移,6例局部复发后截肢。37例生存患者患肢功能按Enneking骨肿瘤外科治疗后功能评定标准,优良率81.1%。21例骨转移瘤患者中,术后存活3个月以上者19例(占90.4%);术后疼痛消失15例(占71.4%),其余均有疼痛减轻;日常生活工作恢复者11例(占52.3%)。结论:对可施行广泛切除的肢体恶性骨肿瘤患者采用不同方法修复重建,行保肢治疗,可在治疗肿瘤的前提下尽量保留肢体功能,对肢体骨转移癌行合适的保肢手术对提高骨转移癌患者的生存质量有积极意义。     

儿童股骨近端骨肿瘤的手术治疗

目的:总结儿童股骨近端骨肿瘤手术治疗的经验教训。方法:37例14岁以下的患者接受不同方式的手术治疗,平均随访37.2个月。结果:病变刮除、瘤壁残留肿瘤组织灭活、植骨术仍是目前治疗良性病变常用的手术方法,应避免损伤股骨头骨骺。对病灶范围较大伴有髋内翻畸形的良性病变,行病变部分刮除、外翻截骨及内固定后可维持正常的颈干角和髋关节功能。瘤段切除、长柄人工股骨头置换术,是修复股骨近端恶性骨肿瘤切除后大块骨缺损的一种较好的方法,具有早期恢复肢体功能、并发症少、材料来源充足等优势。结论:儿童股骨近端骨肿瘤的手术治疗应考虑到病变的性质、侵袭范围、股骨近端的应力分布及儿童骨骺未闭合等特点,采用适当的术式,多可获得良好的效果。     

儿童股骨近端骨肿瘤的手术治疗

目的:总结儿童股骨近端骨肿瘤手术治疗的经验教训.方法:37例14岁以下的患者接受不同方式的手术治疗,平均随访37.2个月.结果:病变刮除、瘤壁残留肿瘤组织灭活、植骨术仍是目前治疗良性病变常用的手术方法,应避免损伤股骨头骨骺.对病灶范围较大伴有髋内翻畸形的良性病变,行病变部分刮除、外翻截骨及内固定后可维持正常的颈干角和髋关节功能.瘤段切除、长柄人工股骨头置换术,是修复股骨近端恶性骨肿瘤切除后大块骨缺损的一种较好的方法,具有早期恢复肢体功能、并发症少、材料来源充足等优势.结论:儿童股骨近端骨肿瘤的手术治疗应考虑到病变的性质、侵袭范围、股骨近端的应力分布及儿童骨骺未闭合等特点,采用适当的术式,多可获得良好的效果.     

儿童股骨近端骨肿瘤的手术治疗

目的：总结儿童股骨近端骨肿瘤手术治疗的经验教训。方法：37例14岁以下的患者接受不同方式的手术治疗，平均随访37．2个月。结果：病变刮除、瘤壁残留肿瘤组织灭活、植骨术仍是目前治疗良性病变常用的手术方法，应避免损伤股骨头骨骺。对病灶范围较大伴有髋内翻畸形的良性病变，行病变部分刮除、外翻截骨及内固定后可维持正常的颈干角和髋关节功能。瘤段切除、长柄人工股骨头置换术，是修复股骨近端恶性骨肿瘤切除后大块骨缺损的一种较好的方法，具有早期恢复肢体功能、并发症少、材料来源充足等优势。结论：儿童股骨近端骨肿瘤的手术治疗应考虑到病变的性质、侵袭范围、股骨近端的应力分布及儿童骨骺未闭合等特点，采用适当的术式，多可获得良好的效果。     

特殊类型全髋关节置换术的疗效分析

目的探讨成人髋臼发育不良致股骨头坏死和股骨上端骨肿瘤患者行全髋关节置换术的疗效。方法对10例16侧成人髋臼发育不良并股骨头坏死者(双侧6例,单侧4例)行全髋关节置换术,另对8例股骨近端肿瘤者(3例复发性骨巨细胞瘤,5例骨转移瘤)作瘤段切除全髋关节置换术。结果术后所有患者均获随访。股骨头坏死16侧Harris评分由术前的平均36.6分恢复到术后的89分;8例股骨近端肿瘤经假体置换后,Harris评分平均为93.5分。结论全髋关节置换术治疗成人髋臼发育不良致股骨头坏死及股骨近端肿瘤疗效确切,用以治疗股骨近端肿瘤具有肿瘤切除彻底、负重早、功能恢复快及生活质量高的优点。     

肢体恶性骨肿瘤及骨转移癌保肢治疗

目的:探讨肢体恶性骨肿瘤及转移癌行瘤段切除假体重建的方法及意义。方法:本组共62例,男38例,女24例;年龄10⁷2岁,平均28.4岁。原发肢体恶性骨肿瘤41例,其中骨肉瘤19例,骨巨细胞瘤9例,恶性纤维组织细胞瘤8例,浆细胞瘤3例,尤文氏瘤1例,骨血管内皮瘤1例。骨转移癌21例,原发病灶分别为:肺癌9例,胃癌3例,肾癌2例,乳腺癌2例,甲状腺癌1例,颌下腺癌1例,原发灶不明者3例。对62例肢体恶性骨肿瘤及转移癌应用肿瘤段切除并修复重建治疗。方法有:①瘤段切除人工假体置换术;②瘤段切除自体腓骨移植术;③瘤段切除髓内针骨水泥重建术。结果:术后随访5⁴2个月,平均14.2个月,41例恶性骨肿瘤中,术后无瘤生存21例,死亡4例,7例发生肺转移,3例发生其他部位转移,6例局部复发后截肢。37例生存患者患肢功能按Enneking骨肿瘤外科治疗后功能评定标准,优良率81.1%。21例骨转移瘤患者中,术后存活3个月以上者19例（占90.4%）;术后疼痛消失15例（占71.4%）,其余均有疼痛减轻;日常生活工作恢复者11例（占52.3%）。结论:对可施行广泛切除的肢体恶性骨肿瘤患者采用不同方法修复重建,行保肢治疗,可在治疗肿瘤的前提下尽量保留肢体功能,对肢体骨转移癌行合适的保肢手术对提高骨转移癌患者的生存质量有积极意义。     

人工假体置换在膝关节周围侵袭性骨肿瘤中的应用

目的: 探讨人工假体在膝关节周围原发侵袭性骨肿瘤保肢术中的临床应用效果。方法: 膝关节周围原发侵袭性骨肿瘤患者 42例。其中股骨远端 24例, 胫骨近端 16例, 腓骨上端 2例。病理类型: 骨肉瘤 21例, 骨巨细胞瘤 (Ⅱ~Ⅲ级) 16例, 软骨肉瘤 4例, 滑膜肉瘤 1例。行骨肿瘤的广泛切除或根治性切除后, 采用人工膝关节假体置换重建, 对骨肉瘤患者同时采用新辅助化疗治疗。结果: 42例患者术后随访 12~72个月, 其中 30例患者无局部复发或远处转移, 12例出现复发。膝关节活动范围: 伸 0°, 屈 85 ~120°。按Enneking法评定功能, ≥23分 22例, 15~22分 17例, <15分 3例, 优良率达到 86%。结论: 人工假体是一种治疗膝关节周围恶性骨肿瘤较好的保肢方法, 能降低局部并发症及提高临床疗效。     

股骨近端上移重建骨盆肿瘤切除后的骨缺损

 目的 总结以股骨近端上移重建骨盆肿瘤切除后骨缺损的手术技术要点,探讨其手术适应证。方法 自2006年10月至2011年5月,对5例骨盆恶性肿瘤患者采用同侧股骨近端截骨上移重建骨盆环连续性、肿瘤型人工关节假体重建髋关节,男3例,女2例;年龄19~55岁,平均30.6岁。软骨肉瘤3例、原始神经外胚层瘤2例。3例肿瘤累及骨盆Ⅰ+Ⅱ区,2例累及Ⅱ+Ⅲ区。所有患者均获得随访,统计并发症发生情况,采用国际骨肿瘤协会(Musculoskeletal Tumor Society, MSTS)功能评分评价患肢功能,评价肿瘤学预后。结果 至末次随访时5例患者中1例死亡,1例带瘤生存,其余3例无瘤生存。主要并发症包括肿瘤局部复发、假体松动、植骨不愈合、浅表感染、坐骨神经麻痹。1例患者术后15个月发生植骨不愈合,内固定松动,可扶拐行走。1例患者因假体松动,术后26个月行翻修手术。1例患者术后6个月肿瘤局部复发改行截肢手术;1例术后18个月局部复发,未进一步处理带瘤生存。MSTS评分为11~25分,平均19.2分。结论 同侧股骨近端上移重建骨盆肿瘤切除后的骨缺损是一种有效重建骨盆连续性的方法,既适用于骨盆Ⅱ+Ⅲ区缺损,也适用于骨盆Ⅰ+Ⅱ区缺损。但此术式仍具有较高的并发症发生率,其近期效果与骨盆假体类似,远期疗效有待于进一步观察。     

人工节段型骨干假体重建治疗肱骨骨干肿瘤

目的探讨人工节段型骨干假体重建治疗肱骨骨干肿瘤的可行性、手术方法以及疗效评估。方法回顾性分析2008年4月至2012年6月期间我院采用肿瘤广泛切除和节段型骨干假体重建术治疗6例肱骨骨干肿瘤患者的手术方案及疗效。6例患者中男性2例,女性4例,年龄为19~74岁,平均50．8岁;其中肱骨干单纯性骨囊肿2例、肺癌单发肱骨干转移瘤2例、肱骨干动脉瘤样骨囊肿1例及肱骨干富含巨细胞纤维性病变1例。结果术后随访8～58个月,平均29．5个月。截至末次随访,5例患者存活,1例患者于术后2（）个月死亡。存活患者肿瘤无局部复发、假体松动等并发症,末次随访时患肢功能状态良好,国际骨与软组织肿瘤协会（MSTS）肢体功能评分平均为24．8分（19~28分）。结论长骨骨干肿瘤大段广泛切除和节段型骨干假体保肢重建是治疗骨干肿瘤的有效手术方案之一。设计定制假体能够确保手术切除至安全外科边界,降低术后局部复发率,并保留正常关节及周围软组织,使患者术后即可负重锻炼,提高了术后生活质量。     

人工间置型假体置换治疗长骨骨干恶性肿瘤（附4例报告）

目的探讨人工间置型假体置换治疗长骨骨干恶性肿瘤的手术方法与疗效。方法 2008年6月-2010年6月,4例长骨骨干恶性肿瘤患者于我院接受骨干瘤段切除人工间置型假体置换手术。4例均为男性,年龄24～60岁,平均41岁。其中股骨干恶性纤维组织细胞瘤1例,肺癌单发股骨干转移瘤1例,软组织腺泡状肉瘤胫骨干转移瘤1例,肾癌单发肱骨干转移瘤1例。结果获得随访16～40个月。截止末次随访时,4例患者患肢功能良好,MSTS评分平均为28.3分（27～30分）。均无局部复发。其中3例无瘤生存;1例胫骨干转移瘤患者术前已有肺转移,术后9个月出现脑转移,目前带瘤存活。结论肿瘤瘤段截除人工间置型假体置换术是治疗长骨骨干恶性肿瘤的有效术式之一,该术式能够达到安全的外科边界,降低局部复发率,并保留良好的肢体功能。     

Intramedullary, antibiotic-loaded cemented, massive allografts for skeletal reconstruction 26 cases compared with 19 uncemented allografts

We compared the outcomes of 26 intramedullary cemented massive allografts with 19 allografts without cementation; all allografts were used for reconstruction after excision of bone sarcomas. In the cementation group, 12 allografts were used as osteochondral grafts (proximal humerus 4, proximal tibia 4, and distal femur 4), 7 as intercalary diaphyseal allografts of the femur, and 7 for a knee arthrodesis. In the uncemented allografts, 3 allografts were used as osteochondral grafts (proximal humerus 2, proximal tibia 1), 2 as intercalary diaphyseal allograft of the femur, and 14 for a knee arthrodesis. The average length of follow-up was 40 (25-60) months. 14 of 26 cemented allografts had an excellent (osteotomy line: not visible) or good (fusion 75% of the cortical thickness) healing of the junction site. Infection developed in 1 allograft. Fracture occurred in 4 of 12 cemented osteochondral allografts due to a subchondral collapse (all in the proximal tibia). Fractures at the junction site in the lower extremity developed in 4 of 22 cemented allografts. In 19 allografts without cementation, 11 had excellent or good healing of the junction. Late infection developed in 4 allografts, fracture of the allograft in 3 cases, and junction fracture in 3 of 17 patients with reconstruction of the lower extremity. Intramedullary graft cementation seems to reduce the fracture and infection rates.     

Failure rates and functional results for intercalary femur reconstructions after tumour resection

MUSCULOSKELETAL SURGERY - To compare the results for patients treated with intercalary endoprosthetic replacement (EPR) or intercalary allograft reconstruction for diaphyseal tumours of the femur...     

Intercalary femur and tibia segmental allografts provide an acceptable alternative in reconstructing tumor resections

Intercalary femur and tibia segmental allografts were implanted in 59 consecutive patients after segmental resection-52 for malignant and seven for benign aggressive bone tumors. The patients were followed up for an average of 5 years. Allograft survival was determined with the Kaplan-Meier method. Infection, fracture, and nonunion rates were determined. The overall 5-year survivorship for the 59 intercalary allografts was 79%, and we found no significant differences between allograft survival in patients receiving or not receiving adjuvant chemotherapy. Infection and fracture rates were 5% and 7% respectively. From 118 host-donor junctions, 11 did not initially heal (9%). The nonunion rate (10 of 69 osteotomies) for diaphyseal junctions was higher than the rate (one of 49 osteotomies) for metaphyseal junctions. Although some patients required reoperations because of allograft complications, it seems that the use of intercalary allograft clearly has a place in the reconstruction of a segmental defect created by the resection of a tumor in the diaphyseal and /or metaphyseal portion of the femur or tibia.     

The clinical outcomes of extracorporeal irradiated and re-implanted cemented autologous bone graft of femoral diaphysis after tumour resection

Purpose

We report the outcome of intercalary resection of the femoral diaphysis and extracorporeal irradiated autologous bone graft reconstruction, without the use of vascularized fibular graft.

Methods

Six patients with Ewing sarcoma of the mid-shaft femur who were treated by limb sparing tumour resection and reconstruction with extracorporeal irradiated autologous bone graft with intramedullary cement between 2002 and 2010 were studied.

Results

Mean age at the time of surgery was ten years (range, four–23). The length of resected femoral bone averaged 23 cm (15–32 cm). The ratio of bone resection length to total femoral length averaged 60 % (56–66 %). The patients had been followed up for between 16 and 79 months (mean, 41 months) at the time of the study. There was no infection nor fracture in this series. Primary union of the distal and proximal osteotomy sites was achieved in three patients. Delayed union of the proximal osteotomy site occurred in one patient that was successfully treated with iliac crest bone grafting. One patient developed non-union at the distal osteotomy site which failed to heal with bone grafting and was therefore converted to endoprosthetic replacement, and another patient was converted to rotationplasty at five months post-surgery because of contaminated margins. Function was excellent in all patients with surviving re-implanted bone. Local recurrence arose in one patient.

Conclusion

Our experience suggests that cement augmentation of extracorporeal irradiated and re-implanted bone autografts offer a useful method of reconstructing large femoral diaphyseal bone defects after excision of primary malignant bone tumours.     

Osteosarcoma and Ewing's sarcoma--The most frequent malignant bone tumors in children--therapy and outcome

BACKGROUND: Osteosarcoma and Ewing's sarcoma are the most frequent malignant bone tumors in children and young adults with relatively poor overall survival rates. METHODS: Between January 1980 and December 1994, 175 children with osteosarcoma and 64 children with Ewing's sarcoma were treated at the author's institution. 22 children had synchronous metastases, 19 patients had a pathologic fracture. Both groups were treated systemically with chemotherapy regimens (COSS and CESS). Local therapy was amputation or tumor resection and endoprosthetic replacement or biological reconstruction with wide or radical resection margins. In case of Ewing's sarcoma in 35 patients postoperative radiation therapy was done. RESULTS: Five-year overall survival rate for osteosarcoma and Ewing's sarcoma patients is about 63 %, ten-year survival rate for osteosarcoma patients is 60.2 %, for Ewing's sarcoma patients 54.5 %. Prognostic factors significantly influencing overall survival rates are tumor response to chemotherapy (p values = 0.0056 and 0.013, respectively), surgical treatment with adequate resection margins (p value = 0.0001 for osteosarcoma patients) and development of postoperative metastases (p value = 0.0001 for both groups). CONCLUSION: For both groups of malignant bone tumors systemic chemotherapy as well as adequate surgical therapy are necessary to reduce the rates of local recurrences and to achieve better survival rates.     

Endoprosthetic reconstruction for large extremity soft-tissue sarcoma with juxta-articular bone involvement: functional and survival outcome

Background

Large extracompartmental limb soft-tissue sarcoma with juxta-articular bone involvement poses major challenges in disease management. Radical resection of sarcoma frequently requires concomitant bone resection and reconstruction. We describe the clinical outcomes of endoprosthetic reconstruction and the complications associated with this procedure.

Methods

Thirty patients with soft-tissue sarcomas with local juxta-articular bone involvement in an extremity underwent surgery at our center between May 2004 and October 2011, 20 for primary sarcomas and 10 for local recurrences. Clinical data from those patients were analyzed retrospectively. The bone affected included the proximal femur (10 cases), the distal femur (nine cases), the proximal humerus (eight cases), the proximal tibia (two cases), or the total femur (one case). Wide excision of the tumor and the bone tissue involved was performed on every patient, followed by reconstruction of the subsequent defect using tumor endoprosthesis. All patients underwent regular follow-up for an average of 25 (range, 3–84) mo.

Results

Three patients had poor wound healing. Implant fractures leading to additional revisions occurred in two cases. Local tumor recurrence developed in four patients. There were 15 patients with lung metastases, and 11 patients died of disseminated metastases. In the latest follow-up, 14 patients survived free of disease and five were alive with tumors. The mean Musculoskeletal Tumor Society functional analysis for proximal femur, distal femur, proximal tibia, proximal humerus, and total femur were 90%, 82%, 73%, 71%, and 60%, respectively. The 2- and 5- y survival rates were 61.6% and 30.0%, respectively.

Conclusions

Endoprosthetic reconstruction could yield satisfactory results as a wide excision and limb salvage therapeutic strategy for patients with large extracompartmental soft-tissue sarcomas with juxta-articular bone involvement. Acceptable complications occurred in the present report.     

定制肿瘤型铰链膝关节假体置换术后假体生存率及并发症分析

目的 探讨定制肿瘤型膝关节假体置换术后的假体生存率及并发症发生率.方法 对1996年4月至2007年4月接受定制肿瘤型铰链膝关节假体置换且随访资料完整的85例进行回顾性分析,男54例,女31例;年龄11～72岁,平均(31.33±15.3)岁.骨肉瘤43例,骨巨细胞瘤31例,软骨肉瘤4例,转移瘤3例,恶性纤维组织细胞瘤2例,Ewing肉瘤1例,纤维肉瘤1例.股骨远端43例,胫骨近端42例.均行瘤段广泛切除及国产骨水泥定制肿瘤型铰链膝关节假体重建.结果 随访3～124个月,平均45.8个月.并发症发生率27.1%(23/85),股骨远端25.6%(11/43),胫骨近端28.6%(12/42);发生于术后3年内13例次,3～5年3例次,5年以上7例次.与手术相关的并发症(切口不愈合、假体周围深部感染、腓总神经损伤等)6例次,全部发生于术后3年内;与假体相关的并发症(假体松动及断裂、假体关节脱位、假体周围骨折等)17例次,发生于术后3年以内7例次、3～5年3例次、5年以上7例次.假体生存率三年79.4%、五年67.7%、七年62.3%,股骨假体分别为86.6%、79.2%、73.5%,胫骨假体分别为66.1%、53.7%、48.8%.结论 与手术相关的并发症多发生于术后3年内,与假体相关的并发症于术后3年内及5年以上高发.使用国产定制肿瘤型膝关节假体置换术后早期即可发生与假体相关的并发症.

Abstract：

Objective To retrospectively investigate the endoprosthetic survival and complications after custom-made tumor prosthesis replacement of knee joint.Methods From April 1996 to April 2007,85 patients with bone tumors around knee joints undergoing custom-prosthetic replacement were respectively analyzed,including 54 males and 31 females with an average of 31.33±15.3 years(range,11-72).The diagnoses were osteosarcoma(43 patients),giant cell tumor(31),chondrosarcoma(4),metastatic tumor(3),malignant fibrohistiocytoma(2),Ewing sarcoma(1),and fibrosarcoma(1).The distal femar was affected in 43 patients and the proximal tibia in 42.All patients in this group underwent wide resection and domestic custommade cemented endoprosthetic reconstruction.Results Mean following was 45.8 months.The overall complication rate was 27.1%(23/85),which was 25.6% in distal femar and 28.6% in proximal tibia.Thirteen complications occurred within 3 years after definite surgery,3 in 3-5 years,and 7 over 5 years.All of 6 operation-relation complications(wound dehiscence,periprosthetic infection,peroneal nerve injury,etc) occurred within 3 years.Seven prosthetic-related complications(prosthetic loosening or breaking,dislocation,periprosthetic fracture,etc)occurred within 3 years,3 occurred in 3-5 years,and 7 over 5 years after definite surgery.The overall endoprosthetic cumulative survival rate was 79.4%,67.7%and 62.3% after 3,5 and 7 years,respectively;which was 86.6%,79.2% and 73.5% in distal femur;66.1%,53.7% and 48.8% in proximal tibia.Conclusion All operation-related complications occurred within 3 years,prosthesis-related complications occurred mainly within 3 years and over 5 years postoperatively.Prosthesis-related complications could occur iu the early stage after using domestic custom-made prosthesis reconstruction.