摘要
目的以数字散斑法测量股骨骨折钢板固定术中在不同拉力条件下的钢板螺钉的位移,为临床提供生物力学依据。方法取6根股骨,于股骨干中点横行锯断,制造股骨中段骨折模型。将骨折标本进行复位用10孔钢板固定,骨折线两端各使用5枚螺钉固定。将实验模型设计成10种状态进行对比测量锁钉位移,在100、200N(牛顿)拉力下,用电子万能试验机进行加载拉力测量,通过相关软件计算位移。结果10种状态位移比较,第1种与第10种、第2种与第9种、第3种与第8种、第4种与第7种、第5种与第6种的比较,差异无统计学意义(P>0.05);其余两两比较,差异有统计学意义(P<0.05)。结论骨折线两端的2枚螺钉是承受较多应力的部位,易于发生断裂,所有螺钉的固定应尽量在一条直线上使负荷平衡。
[Objective]To measure the displacement of steel plate screw for femoral shaft fracture under different pull by digital speckle,and provide Biomechanical basis for clinic.[Methods]Totally 6 femoral specimen were taken.Middle femoral shaft fracture model was made by transverse sawing of femur in midpoint.The specimens were reset and fixed by 10-hole plate,each 5 screws fixed both ends of fracture line.Experimental model was designed into 10 kinds of state;the displacement of each state was compared.Electronic universal testing machine was used to conduct load pull measurement,and the displacement was calculated by related software.[Results]There was no significant difference between state 1 and 10,2 and 9,3 and 8,4 and 7,5 and 6 （P〉0.05）,and the rest comparisons were significant （P〈0.05）.[Conclusion]The 2 screws,which fix both ends of fracture line,withstand more stress so that they are easy to breakdown.It is necessary to fix all screws in line to keep load balance.
出处
《职业与健康》
CAS
2010年第5期587-588,共2页
Occupation and Health
基金
云南省科技厅-昆明医学院联合专项基金资助项目(2007C0043R)
云南省教育厅科学研究基金立项资助项目(07Z10199
03Y508C
13000035)
关键词
股骨干
骨折
钢板
内固定术
生物力学
Femoral shaft
Fracture
Steel plate
Internal fixation
Biomechanics
