The basic research and long term follow up study of lumbar spondylolysis and isthmic spondylolisthesis treated with direct repair and fixation with single vertebra reduction and fixation system
- VernacularTitle:单椎体复位固定系统治疗腰椎峡部崩裂及滑脱的相关基础研究与远期临床疗效
- Author:
Zhonglai QIAN
;
Tiansi TANG
;
Huilin YANG
- Publication Type:Journal Article
- Keywords:
Lumbar vertebrae;
Spondylolisthesis;
Spondylolysis;
Biomechanics
- From:
Chinese Journal of Orthopaedics
2000;0(11):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To conduct biomechanical study and three dimensional finite element analysis on lumbar spondylolysis and spondylolisthesis treated with single vertebra reduction and fixation system(LSRF), and to evaluate the long term outcome of isthmic spondylolisthesis treated with direct repair and fixation with LSRF. Methods Biomechanical characteristics of LSRF was tested, and three dimensional finite element model of lumbar spondylolysis and isthmic spondylolisthesis was established, the stress of lumbar in spondylolisthesis was observed after fixation and reduction. Thirty two patients with spondylolysis and isthmic spondylolisthesis were treated with direct repair and fixation with LSRF designed by the authors from 1992 to 1995. Eighteen cases had spondylolysis, and the others accompanied with spondylolisthesis. The patients age was 28-46 years, with an average of 36.4 years. Results The biomechanical study and three dimensional finite element analysis showed that LSRF has good ability in reduction and rigid fixation. All patients were followed up for an average of 5.6 years. The latest radiographs showed that bony union occurred in 29 cases. There was no breakage and pullout of screws except dislocation of hook in 2 patients. By Henderson standard, the result was excellent in 22, good in 6, fair in 2, poor in 2. Conclusion LSRF has stronger fixation strength and higher fusion rate. Direct repair and fixation with LSRF is a good procedure for younger and middle aged patients with spondylolysis and isthmic spondylolisthesis.
