Biomechanical comparison of anterior lumbar screw-plate fixation versus posterior lumbar pedicle screw fixation.
10.1007/s11596-014-1372-3
- Author:
Lie-hua LIU
1
;
Cong-tao GUO
;
Qiang ZHOU
;
Xiao-bing PU
;
Lei SONG
;
Hao-ming WANG
;
Chen ZHAO
;
Shi-ming CHENG
;
Yang-jun LAN
;
Ling LIU
Author Information
1. Department of Orthopedics, Southwest Hospital, Orthopedics Center of PLA, Third Military Medical University, Chongqing, 400038, China, 651520561@qq.com.
- Publication Type:Journal Article
- MeSH:
Adult;
Bone Plates;
Bone Screws;
Female;
Humans;
Lumbar Vertebrae;
pathology;
physiopathology;
Male;
Materials Testing
- From:
Journal of Huazhong University of Science and Technology (Medical Sciences)
2014;34(6):907-911
- CountryChina
- Language:English
-
Abstract:
Anterior lumbar interbody fusion (ALIF) followed by posterior pedicle screw fixation (PSF) in a second procedure is mostly used to implement lumbar spine fusion. ALIF followed by anterior lumbar screw-plate has a lot of advantages, but its biomechanical stability requires confirmation. This study evaluated the biomechanical stability of a novel anterior lumbar locked screw-plate (ALLSP) by comparison with posterior lumbar PSF. Twelve fresh human cadaveric lumbar specimens (L4-L5) were assigned to four groups: ALIF+PSF group, ALIF+ALLSP (both fixed) group, ALIF group and an untreated control (both non-fixed) group. The first three groups received implantation of a rectangular titanium cage. Tests under axial compression, flexion, extension, lateral bending, or rotation showed that the fixed groups had significantly stronger stability than the non-fixed groups (P=0.000 for all). The ALIF+ALLSP group had significantly greater axial stiffness under applied axial compression and significantly less angular displacement under rotational forces than the ALIF+PSF group. The angular displacement of the ALIF+ALLSP group was less under flexion than that of the ALIF+PSF, and the angular displacement under lateral bending and extension was greater, but these differences were not statistically significant. In summary, the ALLSP conforms to the anterior lumbar spine and has good biomechanical stability. It is a reliable choice for enhancing the stability of ALIF.
