【摘要】 目的:观察自制跟骨解剖钢板及易断螺栓系统的生物力学性能,同时研究其固定跟骨骨折的有效性。方法:将16具新鲜足标本随机分为试验组与对照组,分别进行轴向加压损伤试验,制成跟骨骨折模型,并记录试验组标本的最大载荷及最大足弓位移。试验组标本采用自制钢板螺栓系统进行内固定,对照组行传统AO钢板螺钉固定。完成固定后进行轴向加压试验,测量并记录两组标本的最大载荷、足弓位移和跟骨增宽。结果:试验组标本发生跟骨骨折时的最大载荷、足弓最大位移分别为(5711.19±86.55)N和(18.57±2.79)mm,经自制钢板螺栓系统固定后的最大载荷及负荷600N时的足弓位移、足弓最大位移、跟骨增宽分别为(7866.74±181.58)N、(1.54±0.87)mm、(19.35±3.64)mm和(0.54±0.37)mm。对照组跟骨骨折模型经AO钢板螺钉固定后,测得最大载荷及负荷600N时的足弓位移、跟骨增宽分别为(6702.94±241.06)N、(3.31±1.07)mm和(1.73±0.69)mm。试验组标本行内固定前、后进行比较,最大载荷的差异具有统计学意义(P<0.01),而最大足弓位移间差异无统计学意义(P>0.05);固定后两组标本之间比较,各参数间差异均具有统计学意义(P<0.01)。结论:跟骨骨折经自制内固定系统治疗后完全能达到正常足的生物力学性能,并能维持足弓强大的载荷,跟骨解剖钢板及易断螺栓系统的固定强度和效果均优于AO钢板螺钉内固定系统。更多还原

【Abstract】 Objective:To study the biomechanical properties of self designed calcaneal anatomical plate and pre cut gudgeon system and its efficacy for calcaneal fracture fixation. Methods:Sixteen fresh foot specimens were randomly divided into experimental group and the control group. Axial compressive load were applied to all specimens in order to create a calcaneal fracture model,and the maximum load and the maximum arch displacement of experimental group were recorded. In experimental group,self designed intenal fixation system were utilized,while the AO plate internal fixation system were utilized in the control group. Axial compressive test were applied again to both groups,and the maximum load,the foot arch displacement and calcanus broadens were measured and recorded. Results:Comparison between before and after fixing the calcaneus fracture by self designed internal fixation system in experimental group,the difference of the maximum load was significant (P<0.01),but there was no significant difference (P>0.05) of the maximum arch displacement. All parameters were significantly different (P<0.01) between the experimental group and the control group. Conclusion:The fractured calcaneus will be able to regain normal foot biomechanical function after treated by self designed internal fixation system,and able to support foot arch to bear great load. The self designed internal fixation and pre cut gudgeon system is considered to outperform the conventional AO internal fixation system with its better effectiveness and outcome in treating calcaneus fractures.更多还原