CAJ | 학술논문

背景：目前国际上还没有统一骨组织力学性能测试的试验标准。以往将传统传感器引入骨折位移的研究，存在精度低、高消耗成本等问题。 　　目的：采用数字散斑法测量肱骨骨折内固定后钢板螺钉的位移特点。 　　方法：取8根肱骨，于其中点横断，制造肱骨中段骨折模型。将标本用8孔钢板固定，骨折线两端各使用4枚螺钉。将实验模型设计成5种状态进行对比分析：状态a是骨折后加压钢板坚强内固定组(未锯断，模拟骨折愈合)，状态b是在状态a锯断后基础上近端去1枚螺钉，状态c是在状态b的基础上远端去1枚螺钉，状态d是在状态c的基础上近端去1枚螺钉，状态e是在状态d的基础上远端去1枚螺钉。螺钉编号顺序从上到下依次为1-8号，即骨折线上位螺钉为1-4号，骨折线下位螺钉为5-8号。用电子万能试验机进行加载100 N与500 N测量，通过相关软件计算位移。 　　结果与结论：在不同载荷间的总位移比较，差异有显著性意义(F=49.155，P<0.001)，即随着加载力的增大，5种模拟状态下第4钉、第5钉的总位移值均呈逐渐增大趋势。提示骨折线两端的2枚螺钉是承受较多应力的部位(应力集中)，易于发生断裂，应选用比现有螺钉直径增大1-2.5 mm的螺钉，增加骨折线旁固定螺钉的稳定性以避免断钉等后遗症。
배경：목전국제상환몰유통일골조직역학성능측시적시험표준。이왕장전통전감기인입골절위이적연구，존재정도저、고소모성본등문제。 　　목적：채용수자산반법측량굉골골절내고정후강판라정적위이특점。 　　방법：취8근굉골，우기중점횡단，제조굉골중단골절모형。장표본용8공강판고정，골절선량단각사용4매라정。장실험모형설계성5충상태진행대비분석：상태a시골절후가압강판견강내고정조(미거단，모의골절유합)，상태b시재상태a거단후기출상근단거1매라정，상태c시재상태b적기출상원단거1매라정，상태d시재상태c적기출상근단거1매라정，상태e시재상태d적기출상원단거1매라정。라정편호순서종상도하의차위1-8호，즉골절선상위라정위1-4호，골절선하위라정위5-8호。용전자만능시험궤진행가재100 N여500 N측량，통과상관연건계산위이。 　　결과여결론：재불동재하간적총위이비교，차이유현저성의의(F=49.155，P<0.001)，즉수착가재력적증대，5충모의상태하제4정、제5정적총위이치균정축점증대추세。제시골절선량단적2매라정시승수교다응력적부위(응력집중)，역우발생단렬，응선용비현유라정직경증대1-2.5 mm적라정，증가골절선방고정라정적은정성이피면단정등후유증。
BACKGROUND:There is no unified measure of bone tissue mechanical property test at present. The study concerning traditional sensor for fracture displacement had some problems such as low precision, and high consumption cost. OBJECTIVE:To measure the displacement of plate and screw after internal fixation for fracture of humerus using digital speckle method. METHODS:A total of eight humeral specimens were taken. The steel plate fixation model in the humerus 1/2 was made. The specimens were fixed using eight-hole steel plate, and four screws were fixed on each end of fracture line. Five conditions of experimental model were designed for comparative analysis. Condition a:compression plate fixation group (not saw off, to simulate fracture healing). Condition b:on the basis of sawing off in condition a, one screw was removed on the proximal end. Condition c:on the basis of condition b, one screw was removed on the distal end. Condition d:on the basis of condition c, one screw was removed on the distal end. Condition e:on the basis of d, one screw was removed on the distal end. The screws were numbered No. 1-8 from top to bottom. That is, the screws on upper fracture line were numbered No. 1-4, and those on the lower fracture line were numbered No. 5-8. The specimens were instal ed on electronic universal testing machine, and loaded 100 N and 500 N. The displacement was calculated using the related software. RESULTS AND CONCLUSION:Significant differences in total displacement were detected under different loads (F=49.155, P<0.001). With increased load, the total displacement of the fourth and fifth screws gradual y increased under five kinds of conditions. These indicated that the two screws on the two ends of the fracture line endured more stresses (stress concentration), and easily broke. It would be better to choose the screw with the screw diameter of 1-2.5 mm bigger than the present one in order to increase its stability to avoid the breakage of screws.