The design and clinical application of single arm suspended reduction fixation device(HOIST device) for spondylolisthesis
- VernacularTitle:单臂悬吊腰椎滑脱复位固定器(HOIST器械)的设计与临床应用
- Author:
Yamin SHI
;
Shuxun HOU
;
Li LI
- Publication Type:Journal Article
- Keywords:
Spondylolisthesis;
Lumbar vertebrae;
Internal fixators
- From:
Chinese Journal of Orthopaedics
1998;0(12):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To describe the structure and clinical application of the single arm suspended reduction fixation device(HOIST device) for spondylolisthesis. Methods HOIST device is composed of the hauling screw, open angle screw(upholding screw), blocker, angle connective bar and blocking ring. Through the different assembly of the angle screws and the connective bar, to increase or decrease the fixation angle of the angle screw which as an upholding arm and the connective bar to meet the needs of different lumbosacral angles and hauling screw reducing distance. Twenty three patients with an average slipping rate of 25％－ 50％ , were treated with the device, and among them, intervertebral implantation of BAK was done in 5 patients and intervertebral fusion was performed in 18 patients. Results The mean duration of follow up was 10.3 months. Olisthy was reduced completely, clinical symptoms disappeared and there was no serious complications. Conclusion This device only required fixation of the slipped and its inferior adjacent vertebral body, and then it causes little influence to the movement of the lumbar spine. The arm of force of the reduction is short, so it is especially indicated for mild and moderate spondylolisthesis.
