MECHANICAL EVALUATION OF SPINAL FIXATION STABILITY PROVIDED BY THREE INTERNAL FIXATION DE- VICES FOR THROACOLUMBAR SPINE FRACTURES / 解放军医学杂志

ABSTRACT

By mechanical comparison study of ARRIF,Dick and AF ,their reliable basis for further clinical application was evaluated. Models of spinal fracture were made using fresh cadavers. According to the Latin squre experimental designing principle, the fracture specimens were fixed with ARRIF,Dick and AF separately. The shift and angle changes were observed under different loads,and the analysis of variance was performed to all the data with the SPSS software . The single spinal compression fracture model showed no significant shift and the mechanical features were similar when it was fixed by ARRIF,Dick and AF. The model of spinal compression fracture with three spinal damages showed significant differences among these three fixings when axial torsion load was given. ARRIF and AF were clearly superior to Dick. The histological observation of ARRIF recorded no significant changes in the bone trabecula around the nail pass and the structure kept normal. The mechanical feature of ARRIF was basically similar to that of AF and Dick. Our conclusion is that because of the characteristics of its designing, the anti-axial torsion ability of ARRIF is outstanding and it can be easily fixed in application, thus it holds certain value in clinical practice.