摘要
目的通过对尸体标本的力学研究比较股骨近端防旋髓内钉(PFNA)和经皮加压钢板(PCCP)固定治疗股骨粗隆间骨折的生物力学性能。方法 8具新鲜尸体的双股骨上段标本共16侧,建立A1.1型(AO分型)股骨粗隆间骨折模型。随机分为PFNA组和PCCP组,各8侧,先行扭转强度试验,再行压缩强度试验,最后进行破坏试验。结果标本扭转强度测试表明扭转1.5°时2组扭矩及扭转刚度比较差异无统计学意义(P>0.05),表明2种内固定抗旋转性能相近。标本压缩强度测试表明800 N载荷下2组的压缩位移及刚度比较差异有显著统计学意义(P<0.05),PFNA组明显高于PCCP组。破坏试验中2组的极限载荷比较差异有显著统计学意义(P<0.05),PFNA组明显大于PCCP组。结论 PFNA具有良好的抗旋转能力,其抗压缩能力强于PCCP,在内固定治疗股骨粗隆间骨折时较PCCP更具生物力学优势。
Objective To compare the biomechanical characteristics of PFNA and PCCP in the fixation of femoral intertrochanteric fracture through the biomechanical test of femur specimens from fresh cadavers. Methods Sixteen specimens of bilateral femurs from 8 fresh cadavers were prepared, and the femoral intertrochanteric fracture model of A1.1 （AO classification） was established. The specimens were randomly divided into PFNA group and PCCP group. The torsional strength test was performed first, then compression strength test, and finally destructive testing. Results The torsional strength tests of specimens showed that： both torque and torsional stiffness of two groups in turn 1.5~, had no statistical significance（P 〉 0.05）, the anti-retational features of the 2 internal fixation was similar. The compressive strength test of specimens showed that： both displacement and compression stiffness of two groups under 800 N load had significant statistical significance （P 〈 0.05）, PFNA group was significantly higher than that of PCCP. The destructive testing showed： the maximum load of two groups had significant statistical significance （P 〈0.05）, PFNA group was larger than the PCCP group. Conclusion PFNA is designed scientifically with good anti-rotation property. It is better than PCCP in anti-compression property,offers distinct biomechanical advantage over PCCP in the treatment of femoral intertrochanteric fracture.
出处
《中国骨与关节损伤杂志》
2014年第8期756-758,共3页
Chinese Journal of Bone and Joint Injury
基金
深圳市龙岗区科技发展基金(ys2012189)
关键词
股骨粗隆间骨折
股骨近端防旋髓内钉
经皮加压钢板
生物力学
Femoral intertrochanteric fracture
Proximal femur nail antirotation
Percutaneous compression platin
Biomechanics
