Posterior lumbar interbody fusion using single anatomical threaded cage with transpedicular screw rod fixation: biomechanical study
- VernacularTitle:单枚腰椎间融合器附加椎弓根螺钉行后路腰椎椎体间融合术的生物力学评价
- Author:
Zhao WANG
;
Jie ZHAO
;
Yijin WANG
;
Xinwei WANG
;
Tiesheng HOU
;
- Publication Type:Journal Article
- Keywords:
lumbar vertebrae;
anatomical threaded cage;
transpedicular screw;
posterior lumbar interbody fusion;
biomechanics
- From:
Academic Journal of Second Military Medical University
1981;0(04):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To assess the relative stability and kinematics of the lumbar intervertebral segmental stiffness among posterior lumbar interbody fusion(PLIF) using one anatomical posterolateral cage with or without transpedicular screw rod fixation. Methods: Each of the 6 bovine lumbar functional spinal units(FSV) was tested under 6 different treatments. Test order was intact and every group differed in internal fixation of transpedicular screw. Group 1 referred to the normal lumbar functional spinal units. Group 2 was treated by left unilateral facetectomy and discoidectomy. Group 3 had anatomical threaded cages inserted on the left. Group 4 had anatomical threaded cages inserted on the left and fixed by right transpedicular screws. Group 5 had left inserted anatomical threaded cages and was fixed by left transpedicular screws. Group 6 had anatomical threaded cages inserted on the left side and was fixed by bilateral transpedicular screws. Nondestructive tests were performed in pure compression, flexion, extension, and lateral bending. Results: Unilateral discectomy and facetectomy had lower stiffness than normal FSU by 69% and 44% in pure compression, flexion, extension, and lateral bending. Single anatomical posterolateral cage group had higher stiffness than discectomy and facetectomy group, up by 55% and 28%. However, its stiffness was lower than normal FSU by 41% and 23%. Single anatomical cage with unilateral transpedicular screw fixation (left or right) had higher stiffness than normal FSU by 15% 17% and 20% 50% respectively. Single anatomical cage with transpedicular screw fixation was much stiffer than normal FSU by 18% and 65%. Conclusion: Adequate postoperative stability can be achieved by posterior lumbar interbody fusion with insertion of a single anatomical cage combined with a transpedicular screw.
