The effect of biomechanis with different bone density by the pedicle screws fixation
10.3969/j.issn.1671-8348.2017.06.011
- VernacularTitle:不同骨密度下腰椎椎弓根螺钉固定在疲劳实验前后的生物力学比较
- Author:
Shu LIU
;
Feng SU
;
Yanbo WANG
;
Chunsheng WANG
;
Jie GUO
- Keywords:
osteoporosis;
lumbar vertebrae;
bone screws;
fracture fixation;
stability
- From:
Chongqing Medicine
2017;46(6):755-757
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the biomechanis with different bone density by the pedicle screws fixation before and after fatigue test.Thus provide biomechanical basis for the clinical work.Methods A total of 27 fresh lumbar vertebrae samples of adult sheep (L1-L5) were equally divided into three groups,such as group A of decalcified with HCL 0 h,group B of decalcified with HCL 2 h and group C of decalcified with HCL 4 h,by using the random number table method,every groups was 9 models.Four screws was performed on the L4-L5 pedicle of vertebral arch of the three groups.Three groups were performed fatigue test of 250 000 times in 4 direction (flexion,extension,left lateral bending,right lateral bending) by (300+ 105) N load.The range of motion(ROM),the axial compressive stiffness were measured and the results in every group were compared before and after fatigue test.Results After fatigue test,ROM and the axial compressive stiffness had no significant change in group A (P＞0.05),but ROM of B group and C group were both increased and the axial compressive stiffness were decreased,Significance was found with and between groups.Conclusion The stability of people who are performed pedicle screws simplly may be decrease when the spine of osteopenia.
