3D-printed prostheses for large bone defect reconstruction following bone tumor surgery北大核心

BACKGROUND: Tumor segment resection is one of the standard methods for the treatment of bone tumors. However, the reconstruction of bone defects atumor resection faces many challenges. A growing number of researchers are focusing on 3D-printed prostheses for bone defect repair and reconstruction following bone tumor surgery. OBJECTIVE: To explore the feasibility of 3D-printed prostheses in the reconstruction of large bone defect following bone tumor surgery and to evaluate the postoperative outcomes. METHODS: Retrospective analysis of clinical data of 24 patients [19 males and 5 females, age 23.8 (6-61) years] who underwent bone tumor resection and 3D-printed prosthesis implantation in the Department of Bone Oncology, the First Affiliated Hospital of Xinjiang Medical University from December 2020 to September 2021 was conducted. There were 7 cases with distal femur tumor, 5 with pelvis tumor, 4 with proximal tibia tumor, 3 with middle femur tumor, 1 with distal tibia tumor, 1 with proximal humerus tumor, 1 with middle humerus tumor, 1 with scapula tumor, 1 with ulna tumor, and 22 cases with primary tumors (13 osteosarcoma, 4 Ewing sarcoma, 2 giant cell tumor of bone, 1 chondroblastoma, 1 chondrosarcoma, and 1 osteoblastoma), 2 metastatic carcinoma. Preoperative and postoperative imaging data were recorded and neoadjuvant chemotherapy was administered in 17 cases before surgery. The Musculoskeletal Tumour Society score was used to assess limb function before surgery and 6 months after surgery, and pain was assessed by the Visual Analog Scale, as well as the complications were recorded. RESULTS AND CONCLUSION: (1) All patients undergoing resection of the tumor segment and 3D-printed prosthesis implantation for the reconstruction of the bone defect were followed for 6-49 months, and the results showed that the length of osteotomy was (18.2 ± 7.3) cm and an average intraoperative bleeding volume was 740 (100-3 000) mL. (2) Two patients died of systemic metastasis, the remaining 22 had no pulmonary metastasis or recurrence during the follow-up period, and 1 patient developed aseptic loosening of the prosthesis at 25 months postoperatively. (3) The Musculoskeletal Tumour Society scores were significantly increased, while Visual Analog Scale scores were significantly decreased (P < 0.05) at 6 months postoperatively. (4) The Musculoskeletal Tumor Society score was rated excellent in all 22 patients at the final follow-up. (5) These results suggest that 3D-printed prosthesis is suitable for the reconstruction of large bone defects caused by bone tumor resection. Patients have good postoperative function and few complications. However, further investigations are needed to explore long-term follow-up results. © 2023, Publishing House of Chinese Journal of Tissue Engineering Research. All rights reserved.     

惠州市同型α地中海贫血夫妇的胎儿产前地贫基因诊断分析

目的研究惠州市同型α地贫夫妇的胎儿地贫发生率、基因突变类型和分布特点,为制订本地区地贫的防治工作计划提供科学依据。方法 154对夫妇均为轻型α地中海贫血基因携带者,在孕早期取胎儿绒毛组织,孕中期取脐血或羊水,孕晚期取脐血;对羊水细胞和绒毛组织进行原位培养,脐血进行血液学和血红蛋白分析,分别采用培养前后的组织或脐血进行α地中海贫血基因检测。结果在154例胎儿中,检出重型α地中海贫血胎儿18例,检出率为11.69%;检出α地贫携带者75例,检出率为48.70%;检出缺失型HbH病9例,检出率为5.84%;检出正常胎儿50例,检出率为32.47%;检出纯合子和双重杂合子各1例。结论本研究描述了惠州市同型α地贫夫妇的胎儿α地贫的发生率,基因突变类型和分布特点,为制订本地区地贫的防治工作计划提供科学依据。     

惠州市同型β地中海贫血夫妇的胎儿产前地贫基因诊断分析

目的研究惠州市同型β地贫夫妇的胎儿地贫携带率、基因突变类型和分布特点。方法 116对夫妇均为轻型β-地中海贫血基因突变者,在孕早期取胎儿绒毛组织,孕中期取脐血或羊水,孕晚期取脐血;对羊水细胞和绒毛组织进行原位培养,脐血进行血液学和血红蛋白分析,分别采用培养前后的组织或脐血进行β地中海贫血基因检测。结果 116例胎儿中检出重型β-地中海贫血胎儿27例(23.28%);检出地贫携带者56例(48.28%)。共检出11种突变基因,21种基因型,居前4位的依次是:CD41-42(26.51%)(22/27+56)、IVS-Ⅱ-654(14.46%)(12/27+56)、CD-28(10.84%)(9/27+56),CD17(6.02%)(5/27+56);其中,单突变杂合子9种,56例(67.47%)(56/27+56),双突变杂合子10种,24例(28.92%)(24/27+56),突变纯合子2种,3例(3.61%)(3/27+56),另外,检出少见位点突变CD14-15和CD41-42/43各1例。结论本研究描述了惠州市同型β地贫夫妇的胎儿地贫的发生率和基因突变谱,为制订本地区地贫的防治工作提供科学依据。     

2018—2019年赤道几内亚Bioko岛恶性疟原虫抗药性基因多态性分析

目的　调查赤道几内亚Bioko岛恶性疟原虫多药耐药蛋白1（Plasmodium falciparum multidrug resistance protein 1, PfMDR1）、氯喹抗性转运蛋白基因（P. falciparum chloroquine resistant transporter, PfCRT）和Kelch 13基因（P. falciparum Kelch 13, PfK13）多态性,为当地疟疾防控策略制定提供参考。方法　采集2018—2019年赤道几内亚Bioko岛恶性疟原虫感染者外周血样本85份,提取基因组DNA。采用巢式PCR技术扩增PfMDR1、PfCRT和 PfK13基因,对扩增产物进行DNA测序,并对基因序列进行比对。结果　赤道几内亚Bioko岛恶性疟原虫PfK13基因不存在已知与青蒿素抗性相关的突变;PfMDR1基因和PfCRT基因均存在不同比例抗药性突变,其中PfMDR1_N86Y、PfMDR1_Y184F和PfCRT_K76T突变率分别为35.29%（30/85）、72.94%（62/85）和24.71%（21/85）。结论　赤道几内亚Bioko岛恶性疟原虫PfMDR1、PfCRT基因和 PfK13基因均存在不同程度突变。     

应用核素标记相对和绝对定量技术对大鼠急性脊髓损伤的蛋白组学研究

急性脊髓损伤(ASCI)是一种严重的神经系统创伤,是致残的主要病因之一[1].我们应用核素标记相对和绝对定量(iTRAQ)技术探索SD大鼠ASCI后0 h和6 h的脊髓差异蛋白的表达. 一、材料与方法 1.一般资料:选用新疆医科大学第一附属医院实验动物中心[许可证编号SCXK(新)2011-0004]提供的2个月龄SD雄性大鼠8只,体质量约250 ～ 350 g(平均300 g).动物实验方法符合动物伦理学要求(伦理审批号20120220005). 2.动物实验分组及模型建立:将8只2月龄SD雄性大鼠随机分2组,即脊髓损伤后0 h组(H-0组)、脊髓损伤后6h组(每组各4只),参照Allen's方法建立大鼠ASCI模型.     

低温等离子髓核消融联合盘内注射臭氧治疗腰椎间盘突出征疗效观察

目的探讨C型臂X线机引导下低温等离子髓核消融联合盘内注射臭氧治疗腰椎间盘突出症的疗效。方法120例腰椎间盘突出症患者随机分为低温等离子髓核消融术治疗组（A组）．低温等离子髓核消融术＋臭氧治疗组（B组）,每组各60例。比较2组治疗后7d及1．3个月VAS评分及治疗优良率。结果2组术后症状均有不同程度缓解,术后均未发生出血、腰大肌血肿、椎间盘感染、血管神经损伤等并发症。B组术后7d及1,3个月VAS评分低于A组（P〈0．05）;B组术后3个月优良率为96．67％,A组优良率为81．67％．2组比较差异有统计学意义（P％0．05）。结论C型臂x线机引导下低温等离子髓核消融联合盘内注射臭氧,可明显提高腰椎间盘突出症治疗效果。     

低温等离子髓核消融联合盘内注射臭氧治疗腰椎间盘突出症疗效观察

目的探讨C型臂X线机引导下低温等离子髓核消融联合盘内注射臭氧治疗腰椎间盘突出症的疗效。方法 120例腰椎间盘突出症患者随机分为低温等离子髓核消融术治疗组(A组),低温等离子髓核消融术+臭氧治疗组(B组),每组各60例。比较2组治疗后7 d及1,3个月VAS评分及治疗优良率。结果 2组术后症状均有不同程度缓解,术后均未发生出血、腰大肌血肿、椎间盘感染、血管神经损伤等并发症。B组术后7 d及1,3个月VAS评分低于A组(P<0.05);B组术后3个月优良率为96.67%,A组优良率为81.67%,2组比较差异有统计学意义(P<0.05)。结论 C型臂X线机引导下低温等离子髓核消融联合盘内注射臭氧,可明显提高腰椎间盘突出症治疗效果。     

应用SELDI-TOF-MS技术对大鼠急性脊髓损伤后脑脊液蛋白组学的研究

急性脊髓损伤(ASCI)是一种严重的神经系统创伤,目前仍缺乏有效的治疗措施[1-2].我们应用表面增强激光解吸电离飞行时间质谱(SELDI-TOF-MS)技术分析大鼠ASCI后脑脊液蛋白质指纹图谱,找出明显变化的差异蛋白.     

聚丙烯人工补片在骨恶性肿瘤关节置换中的应用

目的探讨骨恶性肿瘤关节置换患者术中应用聚丙烯人工补片修复关节囊及软组织的方法及其价值。方法2014年3月至2017年1月,回顾性分析12例接受肩关节及髋关节周围非病理性骨折的骨恶性肿瘤关节置换手术患者,男7例,女5例;年龄5~74岁,平均42岁。肩关节置换4例,髋关节置换8例。骨转移癌7例,骨原发性恶性肿瘤5例。所有患者均行广泛切除+假体置换术,并用聚丙烯人工补片修复关节囊。患者术前、术后的关节功能用美国骨与软组织肿瘤协会(musculoskeletal tumor society,MSTS)功能评价系统进行评估。结果本组患者均获随访,随访时间6~20个月,平均10.5个月。术后平均5d拔除术区引流管,伤口均I期愈合,术后功能恢复良好,均无术后并发症,伤口渗液无明显增多。术前MSTS关节功能评定,良4例,可8例;术后MSTS关节功能评定,良10例,可2例。随访期间,所有患者对诊疗效果满意。结论聚丙烯人工补片对骨恶性肿瘤广泛切除后软组织缺损的修复及关节假体置换后关节的稳定性和动力重建起到了重要的作用,近期疗效满意。     

抗结核骨组织工程复合体局部治疗兔脊柱结核的对比研究

目的探讨以羟基磷灰石与/β-磷酸三钙(hydroxyapatite and/β-tricalcium phosphate,HA/β-TCP)复合体材料及同种异体骨为支架材料构建的抗结核性骨组织工程复合体,评价两种不同抗结核骨组织复合体治疗兔脊柱结核的效果。方法取3月龄经造模成功后的新西兰大白兔36只,行病灶清除术,随机分为3组,每组12只,A组于骨缺损处植入利福喷丁微球-rADSCs/HA/β-TCP抗结核骨组织工程复合体,B组于骨缺损处植入利福喷丁微球-rADSCs/同种异体骨抗结核骨组织工程复合体,C组清创后未做任何处理。术后4、8、12周行影像学(DR)检查,术后第12周将实验动物处死,取标本,行大体观察、组织病理学观察骨缺损修复情况。结果大体观察发现A组骨缺损区被新生骨组织取代;B组骨缺损基本修复,周边可见大量骨组织形成;C组骨缺损处有少量骨组织形成,可见大量纤维组织覆盖。X线观察发现:4周时,A组骨缺损区可见少量骨痂形成,材料与周围骨组织紧密接触。B组骨缺损区可见骨痂形成,C组骨缺损区界限清晰,可见片状低密度影。8周时,A组骨缺损区明显缩小,材料吸收,边界稍模糊。B组骨缺损区可见片絮状高密度影,C组骨缺损区可见点状钙化影。12周时,A组骨缺损区材料基本吸收,B组骨缺损材料部分吸收,椎间隙部分融合,C组骨缺损区界线尚清,椎间隙破坏缺损。组织病理学检查发现:术后12周,A组材料吸收明显,可见大量纤维骨痂组织生成骨组织。B组可见部分同种异体骨残留,周边可见大量纤维骨痂组织生成骨组织。C组可见大量纤维组织形成。结论利福喷丁微球-rADSCs/HA/β-TCP构建的抗结核骨组织工程复合体具有良好的生物相容性,能够有效填充兔腰椎结核病灶清除术后的骨缺损。