中医正骨2025，Vol.37Issue(2)：28-33,6.
两段式拉力螺钉的滑丝率和加压力研究
The thread stripping rate and pressurization force of a two-segmental lag screw:a biomechanical study
摘要
Abstract
Objective:To observe the thread stripping rate and pressurization force of a two-segmental lag screw(TSLS).Methods:Ten orthopedic surgeons and an independent investigator were recruited to conduct the experiments on synthetic cancellous bone blocks with densities of 0.08,0.16,and 0.32 g/cm(3),respectively.On the synthetic cancellous bone block with the same density,the TSLS and AO lag screw(AOLS)were tightened 10 times,respectively,by each surgeon.In total,the 10 surgeons operated on the synthetic cancellous bone blocks with three different densities for 600 times.After each surgeon finished the operation,the independent investigator advanced the screw until a remarkable decrease of pressurization force was observed,thereby ensuring the pressurization force curve obtained from each test included the ascending phase,the peak value phase,and the descending phase.The pressurization force applied by each surgeon and the investigator when tightened the screw were measured and compared to determine whether the thread was stripped.Meanwhile,the pressuriza-tion forces when the surgeons stopped tightening the screw were recorded to analyze the difference of the pressurization force between TSLS and AOLS.Results:The thread stripping rate of TSLS was lower than that of AOLS(5.33％,75.67％x2=307.923,P=0.000).There was difference in the thread stripping rate of TSLS and AOLS among different surgeons(x2=109.366,P=0.000;x2=17.430,P=0.042).The thread stripping rate of TSLS was lower than that of AOLS on the synthetic cancellous bone blocks with densities of 0.08,0.16,and 0.32 g/cm(3),respectively(x2=126.750,P=0.000;x2=101.282,P=0.000;x2=82.353,P=0.000).Further comparison revealed that there was difference in the thread stripping rate of TSLS,while,no statistical difference in the thread stripping rate of AOLS among the synthetic cancellous bone blocks with different densities(x2=6.470,P=0.039;x2=1.340,P=0.512).The overall pressuriza-tion force of TSLS was higher than that of AOLS(t=-5.800,P=0.000).The pressurization force of both TSLS and AOLS increased with the increase in the density of the synthetic cancellous bone blocks(F=2812.63,P=0.000;F=755.193,P=0.000).Conclusion:TSLS has a higher pressurization force and a lower thread stripping rate compared to AOLS with the same specification.关键词
骨螺丝/骨质疏松性骨折/松质骨/滑丝/加压力Key words
bone screws/osteoporotic fractures/cancellous bone/screw damage/intensity of stress引用本文复制引用
刘超,仇成华,徐达强..两段式拉力螺钉的滑丝率和加压力研究[J].中医正骨,2025,37(2):28-33,6.基金项目
国家骨科与运动康复临床医学研究中心创新基金资助项目(2021-NCRC-CXJJ-ZH-19) （2021-NCRC-CXJJ-ZH-19）
