RENTGENOFUNCTIONAL EVALUATION OF THE SPINE WITH DIFFERENT METHODS OF POSTERIOR FIXATION IN THE EXPERIMENT
Krivoshein A. E.¹, Ignatyev Yu. T.¹, Dochilova E. S.2, Kolesov S.V.3
| Purpose. To compare radiographically the dynamic properties of the vertebral-motor segment (VMS) with different methods of posterior fixation in the experiment. |
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Materials and methods. The object of research was outbred dogs weighing 12±1.5 kg at the age of about 21±3 months. Experimental animals were divided into 2 groups. Animals of group I (n=5) underwent transpedicular fixation of the spine using rigid bolts. Transpedicular fixation of the spine with dynamic nitinol bolts was performed in animals of the II group (n=5).
Results. During the functional study in both groups the range of motions in the test segment prior to surgery was 18±1.2 degree. After the surgery in group I the range of motion at 24 month of rigid VMS fixation was 0±0.03 degrees. During the analysis of the dynamic radiographs of the operated VMS within rigid fixation the motions were absent. In group II with dynamic (nitinol) fixation there were VMS movements in all animals at the average rate of 15±1.3 ° C, which was 78.9% of the initial.
Conclusions. Dynamic transpedicular (nitinol) fixation according to its characteristics allows allocating more physiological dynamic loading, maintaining the range of motion and reducing the load on the support elements.
Keywords: vertebral-motor segment, nitinol, dynamic fixation, rigid fixation.
Corresponding author: Ignatyev Yu.T., Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript
For citation: Krivoshein A.E., Ignatyev Yu.T., Kolesov S.V., Dochilova E.S. Rentgenofunctional evaluation of the spine with different methods of posterior fixation in the experiment. REJR. 2016; 6 (2):29-33. DOI:10.21569/2222-7415-2016-6-2-29-33.
Received: 04.02.2016 Accepted: 19.02.2016