Int J Med Robot - Mini-navigator: a new system for navigated deformity corrections.

Tópicos

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Resumo

CKGROUND: The purpose of this study is to present a new navigation device for deformity correction surgery and to evaluate its accuracy compared with a conventional electromagnetic navigation system in tracking the orientation of synthetic bony fragments.METHODS: This system consists of three sensors and software which can be installed on any personal computer. One sensor is mounted about 1 m above the other sensors. The remaining two sensors are fixed to the bone fragments using Schanz screws. Data from all three sensors are computed using the software to estimate the change in position of the sensors. For the first part of the study 118 planned one and two plane deformities in 5? increments were created. For the second part of the study complex random 3-dimensional deformities were created (300 valid measurements).RESULTS: The mean absolute differences between measurements of the electromagnetic and mini-navigator were 1.8?1.9? in the coronal, 1.1?1.1? in the sagittal and 0.8?0.7? in the transverse plane. Absolute differences between mini-navigator and Fastrak measurements were significantly affected by the magnitude of the deformity (P<0.0001) with better accuracy for lower deformities.CONCLUSIONS: We believe that this new technology is appealing, because of its high accuracy and lower planned costs compared with conventional navigation devices.

Resumo Limpo

ckground purpos studi present new navig devic deform correct surgeri evalu accuraci compar convent electromagnet navig system track orient synthet boni fragmentsmethod system consist three sensor softwar can instal person comput one sensor mount m sensor remain two sensor fix bone fragment use schanz screw data three sensor comput use softwar estim chang posit sensor first part studi plan one two plane deform increment creat second part studi complex random dimension deform creat valid measurementsresult mean absolut differ measur electromagnet mininavig coron sagitt transvers plane absolut differ mininavig fastrak measur signific affect magnitud deform p better accuraci lower deformitiesconclus believ new technolog appeal high accuraci lower plan cost compar convent navig devic

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