背景:脊柱融合术中选择有效的植骨材料十分有必要,自体骨移植被视为脊柱融合术的“金标准”,但其存在取骨区疼痛等并发症。同种异体骨供骨量充足、可避免取骨区并发症,不同的同种异体骨材料在不同部位的脊柱融合中展现了良好的成骨能力...背景:脊柱融合术中选择有效的植骨材料十分有必要,自体骨移植被视为脊柱融合术的“金标准”,但其存在取骨区疼痛等并发症。同种异体骨供骨量充足、可避免取骨区并发症,不同的同种异体骨材料在不同部位的脊柱融合中展现了良好的成骨能力。目的:综述近年来同种异体骨移植材料在脊柱融合术中的应用现状。方法:检索1990-2022年间,在PubMed、Web of Science数据库和中国知网发表的相关中英文文献,英文检索词:“fresh frozen bone,autograft,allograft,freeze-dried bone,demineralized bone matrix,allograft spacer,spinal fusion”;中文检索词:“新鲜冰冻骨,自体骨,同种异体骨,冷冻干燥骨,脱矿骨基质,同种异体骨椎间融合器,脊柱融合”,经筛选后最终纳入95篇文献进行综述。结果与结论:新鲜冰冻骨由于其存在免疫排斥、传播疾病等风险临床运用较少;冷冻干燥骨移植虽然存在延迟愈合,但是其最终融合效果与自体骨相似;脱钙骨基质常作为自体骨填充剂或用于填充椎间融合器而最大发挥其融合能力,与硫酸钙或羟磷灰石等载体的联用使其可塑性和成骨活性提升明显;新型解剖型同种异体椎间融合器成骨活性好、临床融合率高、可有效维持椎间隙高度和椎间孔的正常形状。现有的大量临床研究结果表明同种异体骨材料在脊柱融合术中能达到与自体骨一样的融合效率,并且和自体骨一样安全,是外科医生良好的选择,在临床中得到了大量应用。展开更多
Aim: Intervertebral spacers for anterior spine fusion are made of different materials, which can affect the post-fusion MRI scans. Suscep- tibility artifacts specially for implants made of titanium alloys can decrease...Aim: Intervertebral spacers for anterior spine fusion are made of different materials, which can affect the post-fusion MRI scans. Suscep- tibility artifacts specially for implants made of titanium alloys can decrease the image quality. This study focused on the influence of deter-mined implant parameters like shape and implant volume in MRI artifacting independent from se-lected MRI-sequences. Methods: In this study the post-implantation MRI scans of determined cuboids and cylinders were evaluated. All in-terbody test implants were made of titanium alloys. MRI scans were carried out by using T1 TSE sequences. The total artifact volume (TAV) of all examined implants were calculated for sta-tistical t-test correlation and implant volume (IV)/TAV-relation. Results: Considering all ex-amined test implants with an increasing implant size the TAV became significant larger (p<0,001) with simultaneous reduction of the respective IV/TAV-relation. According to an intergroup TAV- correlation for cylinders and cuboids with an equivalent implant volume the cylindric test im-plants demonstrated a significant smaller arti-fact range (p<0,05). Conclusions: Based on these results the MRI artifacts of larger test im-plants were more limited to the to the implant’s direct surroundings. In this connection for im- plants with identical material volumes a cylin- dric shape demonstrated more advantages con- sidering MRI artifacting than cubic forms.展开更多
Interbody disc spacers for anterior spine fusion are made of different materials, such as titanium alloys or carbon fiber reinforced polymers (CFRP). Implant-related susceptibility artifacts can decrease the quality o...Interbody disc spacers for anterior spine fusion are made of different materials, such as titanium alloys or carbon fiber reinforced polymers (CFRP). Implant-related susceptibility artifacts can decrease the quality of MRI scans. This cadaveric study aimed to demonstrate the extent that implant-related MRI artifacting affects the post fusion differentiation of the spinal canal (SC) and intervertebral disc space (IDS). In 6 cadaveric porcine spines, we evaluated the post-im- plantation MRI scans of a titanium and CFRP spacer that differed in shape and surface qualities. A spacer made of human cortical bone was used as a control. A defined evaluation unit was divided into regions of interest (ROI) to characterize the SC and IDS. Considering 15 different MRI sequences read independently by an interobserver-validated team of specialists artifact-affected image quality of the median MRI slice was rated on a modified score of 0-1-2-3. A maximum score of 15 points for the SC and 9 points for the IDS (100%) was possible. Turbo spin echo sequences produced the best scores for both spacers and the control. Only the control achieved a score of 100%. For the IDS the titanium and CFRP spacer maximally scored 0% and 74%, for the SC 80% and 99%, respectively. By using favored T1 TSE sequences the CFRP-spacer represented clear advantages in post fusion spinal imaging. Independent of artifact dimensions the used scoring system allowed us to create an implant-related ranking of MRI scan quality in reference to the bone control.展开更多
文摘背景:脊柱融合术中选择有效的植骨材料十分有必要,自体骨移植被视为脊柱融合术的“金标准”,但其存在取骨区疼痛等并发症。同种异体骨供骨量充足、可避免取骨区并发症,不同的同种异体骨材料在不同部位的脊柱融合中展现了良好的成骨能力。目的:综述近年来同种异体骨移植材料在脊柱融合术中的应用现状。方法:检索1990-2022年间,在PubMed、Web of Science数据库和中国知网发表的相关中英文文献,英文检索词:“fresh frozen bone,autograft,allograft,freeze-dried bone,demineralized bone matrix,allograft spacer,spinal fusion”;中文检索词:“新鲜冰冻骨,自体骨,同种异体骨,冷冻干燥骨,脱矿骨基质,同种异体骨椎间融合器,脊柱融合”,经筛选后最终纳入95篇文献进行综述。结果与结论:新鲜冰冻骨由于其存在免疫排斥、传播疾病等风险临床运用较少;冷冻干燥骨移植虽然存在延迟愈合,但是其最终融合效果与自体骨相似;脱钙骨基质常作为自体骨填充剂或用于填充椎间融合器而最大发挥其融合能力,与硫酸钙或羟磷灰石等载体的联用使其可塑性和成骨活性提升明显;新型解剖型同种异体椎间融合器成骨活性好、临床融合率高、可有效维持椎间隙高度和椎间孔的正常形状。现有的大量临床研究结果表明同种异体骨材料在脊柱融合术中能达到与自体骨一样的融合效率,并且和自体骨一样安全,是外科医生良好的选择,在临床中得到了大量应用。
文摘Aim: Intervertebral spacers for anterior spine fusion are made of different materials, which can affect the post-fusion MRI scans. Suscep- tibility artifacts specially for implants made of titanium alloys can decrease the image quality. This study focused on the influence of deter-mined implant parameters like shape and implant volume in MRI artifacting independent from se-lected MRI-sequences. Methods: In this study the post-implantation MRI scans of determined cuboids and cylinders were evaluated. All in-terbody test implants were made of titanium alloys. MRI scans were carried out by using T1 TSE sequences. The total artifact volume (TAV) of all examined implants were calculated for sta-tistical t-test correlation and implant volume (IV)/TAV-relation. Results: Considering all ex-amined test implants with an increasing implant size the TAV became significant larger (p<0,001) with simultaneous reduction of the respective IV/TAV-relation. According to an intergroup TAV- correlation for cylinders and cuboids with an equivalent implant volume the cylindric test im-plants demonstrated a significant smaller arti-fact range (p<0,05). Conclusions: Based on these results the MRI artifacts of larger test im-plants were more limited to the to the implant’s direct surroundings. In this connection for im- plants with identical material volumes a cylin- dric shape demonstrated more advantages con- sidering MRI artifacting than cubic forms.
文摘Interbody disc spacers for anterior spine fusion are made of different materials, such as titanium alloys or carbon fiber reinforced polymers (CFRP). Implant-related susceptibility artifacts can decrease the quality of MRI scans. This cadaveric study aimed to demonstrate the extent that implant-related MRI artifacting affects the post fusion differentiation of the spinal canal (SC) and intervertebral disc space (IDS). In 6 cadaveric porcine spines, we evaluated the post-im- plantation MRI scans of a titanium and CFRP spacer that differed in shape and surface qualities. A spacer made of human cortical bone was used as a control. A defined evaluation unit was divided into regions of interest (ROI) to characterize the SC and IDS. Considering 15 different MRI sequences read independently by an interobserver-validated team of specialists artifact-affected image quality of the median MRI slice was rated on a modified score of 0-1-2-3. A maximum score of 15 points for the SC and 9 points for the IDS (100%) was possible. Turbo spin echo sequences produced the best scores for both spacers and the control. Only the control achieved a score of 100%. For the IDS the titanium and CFRP spacer maximally scored 0% and 74%, for the SC 80% and 99%, respectively. By using favored T1 TSE sequences the CFRP-spacer represented clear advantages in post fusion spinal imaging. Independent of artifact dimensions the used scoring system allowed us to create an implant-related ranking of MRI scan quality in reference to the bone control.
