According to the feature that genetic algorithm (GA) is adapted to requirement of culture algorithms (CA) framework, GA is as the population space of CA and these two Algorithms are applied to the intelligent fixing test paper strategy research by combining. This method guides the population evolution efficiently through belief space and speeds up convergence. The experimental results prove that the algorithm keeps good average fitness and high operating efficiency.
Objective
To evaluate the clinical results of self-designed double-pivot extracorporeal reduction device in internal fixation with percutaneous pedicle screws for thoracolumbar fractures.
Methods
From January 2014 to May 2015, a total of 41 patients with thoracolumbar fracture without neurological symptoms underwent minimally invasive fixation with percutaneous pedicle screws. Of them, 22 were treated with our self-designed double-pivot extracorporeal reduction device and the other 20 with common single-pivot extracorporeal reduction device. The 2 groups were compared in terms of pre- and postoperative kyphotic an-gles, correction rates and anterior, middle and posterior heights of injured vertebrae to evaluate the therapeutic effects of the self-designed double-pivot extracorporeal reduction device.
Results
The patients were fol-lowed up for 6 to 18 months (average, 12.3 months). No iatrogenic impairment of nerve root, postoperative infection, or implant failure happened. Compared with preoperation, significant improvements were observed in all the patients regarding cobb’s angle, anterior, middle and posterior heights of the fractured vertebral body (P 0.05).
Conclusion
Compared with the single-pivot reduction device, the self-designed double-pivot reduction device may be preferable in percutaneous pedicle screw fixation for thoracolumbar fractures.
Key words:
Thoracic vertebrae; Lumber vertebrae; Fracture fixation, internal; Bone nails; Surgical procedures, minimally invasive
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