Self-drilling screw bolts are a new product to replace ordinary screw bolts, and thus raise working efficiency ten times and reduce the cost of installation. According to the design theory of integrating drilling bit ...Self-drilling screw bolts are a new product to replace ordinary screw bolts, and thus raise working efficiency ten times and reduce the cost of installation. According to the design theory of integrating drilling bit with driving screw, the self-drilling screw bolt can complete successively the functions of drilling, screwing and fastening within several seconds, with the aid of a simple jig alone. This serves the development of board installations in room decoration and vehicle and ship building.展开更多
The purpose of this study was to compare the biomechanical stability obtained by using our technique featured an anatomical plate and compression bolts versus that of the conventional anatomic plate and cancellous scr...The purpose of this study was to compare the biomechanical stability obtained by using our technique featured an anatomical plate and compression bolts versus that of the conventional anatomic plate and cancellous screws in the fixation of intraarticular calcaneal fractures.Eighteen fresh frozen lower limbs of cadavers were used to create a reproductive Sanders type-Ⅲ calcaneal fracture model by using osteotomy.The calcaneus fractures were randomly selected to be fixed either using our anatomical plate and compression bolts or conventional anatomic plate and cancellous screws.Reduction of fracture was evaluated through X radiographs.Each calcaneus was successively loaded at a frequency of 1 Hz for 1000 cycles through the talus using an increasing axial force 20 N to 200 N and 20 N to 700 N,representing the partial weight bearing and full weight bearing,respectively,and then the specimens were loaded to failure.Data extracted from the mechanical testing machine were recorded and used to test for difference in the results with the Wilcoxon signed rank test.No significant difference was found between our fixation technique and conventional technique in displacement during 20-200 N cyclic loading(P=0.06),while the anatomical plate and compression bolts showed a great lower irreversible deformation during 20-700 N cyclic loading(P=0.008).The load achieved at loss of fixation of the constructs for the two groups had significant difference:anatomic plate and compression bolts at 3839.6±152.4 N and anatomic plate and cancellous screws at 3087.3±58.9 N(P=0.008).There was no significant difference between the ultimate displacements.Our technique featured anatomical plate and compression bolts for calcaneus fracture fixation was demonstrated to provide biomechanical stability as good as or better than the conventional anatomic plate and cancellous screws under the axial loading.The study supports the mechanical viability of using our plate and compression bolts for the fixation of calcaneal fracture.展开更多
目的：探讨椎体内注射辛伐他汀/泊洛沙姆407温敏型智能水凝胶对骨质疏松小型猪腰椎骨质和椎弓根螺钉内固定稳定性的影响.方法：9只健康成年雌性广西巴马小型猪,行双侧卵巢切除术,术后低钙饮食18个月,双侧卵巢切除后18个月小型猪腰椎骨...目的：探讨椎体内注射辛伐他汀/泊洛沙姆407温敏型智能水凝胶对骨质疏松小型猪腰椎骨质和椎弓根螺钉内固定稳定性的影响.方法：9只健康成年雌性广西巴马小型猪,行双侧卵巢切除术,术后低钙饮食18个月,双侧卵巢切除后18个月小型猪腰椎骨密度（bone mineral density,BMD）较切除前降低了25.23％,即骨质疏松模型建立成功.每只骨质疏松小型猪采取自身对照,将3个腰椎（L4～L6）进行随机分组,在椎体左侧钉道内单次注射载辛伐他汀0、0.5、1.0mg的水凝胶,并分别在两侧置入钛合金椎弓根螺钉.3个月后处死,取出每只小型猪的椎体（L4～L6）,剔除椎体周围软组织,在各椎间盘处离断,游离成单个椎体,用双能X线骨密度仪检测BMD,行Micro-CT扫描并定量分析骨小梁微结构及骨整合率,内固定螺钉轴向拔出实验,不脱钙骨组织学观察.结果：辛伐他汀0.5mg、1 mg组椎体与给药前相比,BMD分别增加了32.12％和28.16％,辛伐他汀0.5mg、1mg组椎体与辛伐他汀0mg组相比,BMD分别增加了31.25％和31.09％（P均＜0.01）;辛伐他汀0.5mg、1mg组与辛伐他汀0mg组相比,相对骨体积（BV/TV,％）分别增加了47.49％和43.42％,骨小梁数量（Tb.N）分别增加了49.23％和39.01％,骨小梁厚度（Tb.Th）分别增加了66.09％和54.28％,骨小梁间隙（Tb.Sp）分别降低了55.85％和52.80％,骨整合率分别增加了46.54％和42.63％（P均＜0.01）;辛伐他汀0.5mg与1mg组的最大轴向拔出力（Fmax）与辛伐他汀0mg组相比,分别增加了45.75％和51.53％ （P＜0.01）;组织学观察发现辛伐他汀0.5mg、1mg组螺钉周围骨小梁明显增多,钉骨接触面积明显增大.结论：骨质疏松小型猪腰椎椎体内单次注射低剂量辛伐他汀可促进骨形成,增加骨密度,改善骨骼微结构,增加骨整合率,显著提高椎弓根螺钉在骨质疏松椎体中的稳定性.展开更多
文摘Self-drilling screw bolts are a new product to replace ordinary screw bolts, and thus raise working efficiency ten times and reduce the cost of installation. According to the design theory of integrating drilling bit with driving screw, the self-drilling screw bolt can complete successively the functions of drilling, screwing and fastening within several seconds, with the aid of a simple jig alone. This serves the development of board installations in room decoration and vehicle and ship building.
文摘The purpose of this study was to compare the biomechanical stability obtained by using our technique featured an anatomical plate and compression bolts versus that of the conventional anatomic plate and cancellous screws in the fixation of intraarticular calcaneal fractures.Eighteen fresh frozen lower limbs of cadavers were used to create a reproductive Sanders type-Ⅲ calcaneal fracture model by using osteotomy.The calcaneus fractures were randomly selected to be fixed either using our anatomical plate and compression bolts or conventional anatomic plate and cancellous screws.Reduction of fracture was evaluated through X radiographs.Each calcaneus was successively loaded at a frequency of 1 Hz for 1000 cycles through the talus using an increasing axial force 20 N to 200 N and 20 N to 700 N,representing the partial weight bearing and full weight bearing,respectively,and then the specimens were loaded to failure.Data extracted from the mechanical testing machine were recorded and used to test for difference in the results with the Wilcoxon signed rank test.No significant difference was found between our fixation technique and conventional technique in displacement during 20-200 N cyclic loading(P=0.06),while the anatomical plate and compression bolts showed a great lower irreversible deformation during 20-700 N cyclic loading(P=0.008).The load achieved at loss of fixation of the constructs for the two groups had significant difference:anatomic plate and compression bolts at 3839.6±152.4 N and anatomic plate and cancellous screws at 3087.3±58.9 N(P=0.008).There was no significant difference between the ultimate displacements.Our technique featured anatomical plate and compression bolts for calcaneus fracture fixation was demonstrated to provide biomechanical stability as good as or better than the conventional anatomic plate and cancellous screws under the axial loading.The study supports the mechanical viability of using our plate and compression bolts for the fixation of calcaneal fracture.
文摘目的：探讨椎体内注射辛伐他汀/泊洛沙姆407温敏型智能水凝胶对骨质疏松小型猪腰椎骨质和椎弓根螺钉内固定稳定性的影响.方法：9只健康成年雌性广西巴马小型猪,行双侧卵巢切除术,术后低钙饮食18个月,双侧卵巢切除后18个月小型猪腰椎骨密度（bone mineral density,BMD）较切除前降低了25.23％,即骨质疏松模型建立成功.每只骨质疏松小型猪采取自身对照,将3个腰椎（L4～L6）进行随机分组,在椎体左侧钉道内单次注射载辛伐他汀0、0.5、1.0mg的水凝胶,并分别在两侧置入钛合金椎弓根螺钉.3个月后处死,取出每只小型猪的椎体（L4～L6）,剔除椎体周围软组织,在各椎间盘处离断,游离成单个椎体,用双能X线骨密度仪检测BMD,行Micro-CT扫描并定量分析骨小梁微结构及骨整合率,内固定螺钉轴向拔出实验,不脱钙骨组织学观察.结果：辛伐他汀0.5mg、1 mg组椎体与给药前相比,BMD分别增加了32.12％和28.16％,辛伐他汀0.5mg、1mg组椎体与辛伐他汀0mg组相比,BMD分别增加了31.25％和31.09％（P均＜0.01）;辛伐他汀0.5mg、1mg组与辛伐他汀0mg组相比,相对骨体积（BV/TV,％）分别增加了47.49％和43.42％,骨小梁数量（Tb.N）分别增加了49.23％和39.01％,骨小梁厚度（Tb.Th）分别增加了66.09％和54.28％,骨小梁间隙（Tb.Sp）分别降低了55.85％和52.80％,骨整合率分别增加了46.54％和42.63％（P均＜0.01）;辛伐他汀0.5mg与1mg组的最大轴向拔出力（Fmax）与辛伐他汀0mg组相比,分别增加了45.75％和51.53％ （P＜0.01）;组织学观察发现辛伐他汀0.5mg、1mg组螺钉周围骨小梁明显增多,钉骨接触面积明显增大.结论：骨质疏松小型猪腰椎椎体内单次注射低剂量辛伐他汀可促进骨形成,增加骨密度,改善骨骼微结构,增加骨整合率,显著提高椎弓根螺钉在骨质疏松椎体中的稳定性.
