Pullout test in expansive unilateral open-door laminoplasty of the cervical spine with OsteoMed M3 plate and screws: the screw orientation matters.
- Author:
Kong-he HU
1
;
An-min JIN
;
Yang DUAN
;
Cheng-long LIU
;
Shao-xiong MIN
;
Li-xin ZHU
;
Wei-dong ZHAO
Author Information
- Publication Type:Journal Article
- MeSH: Adult; Biomechanical Phenomena; Bone Plates; Bone Screws; Cervical Vertebrae; surgery; Cervicoplasty; instrumentation; Device Removal; Fracture Fixation, Internal; instrumentation; Humans; Internal Fixators; Male; Materials Testing; Young Adult
- From: Journal of Southern Medical University 2011;31(5):911-913
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo study the impact of screw orientation on the pullout strength of OsteoMed M3 titanium screws in expansive unilateral open-door laminoplasty of the cervical spine.
METHODSSix fresh human cervical spine specimens were randomly numbered and OsteoMed M3 plate and screws were used for an expansive unilateral open-door laminoplasty. The screws were inserted in the lateral mass at different extraversion angles (0°, 30° and 45°). The maximum pullout strength was tested on the ElectroForce material testing machine.
RESULTSThe maximum pullout strength was 81.60∓7.33 N, 150.05∓15.57 N, and 160.08∓17.77 N in extraversion angle 0°, 30°, and 45° groups, respectively. The maximum pullout strength was significantly less in extraversion angle 0° group than in 30° and 45° groups (P<0.05), but similar in the latter two groups.
CONCLUSIONThe pullout strength of the screws inserted at an extraversion angle over 30° provides stronger fixation than an angle of 0° in the unilateral open-door laminoplasty using OsteoMed M3 titanium plate and screws.
