Int J Med Robot - Percutaneous antegrade scaphoid screw placement: a feasibility and accuracy analysis of a novel electromagnetic navigation technique versus a standard fluoroscopic method.

Tópicos

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Resumo

CKGROUND: Central screw positioning in the scaphoid provides biomechanical advantages.METHODS: A prospective randomized study of six fluoroscopically guided and six electromagnetically navigated screw (ENS) placements was performed on human cadavers. Accuracy of screw position was determined. Intraoperative fluoroscopy exposure times, readjustments of drilling directions, complete restarts and complications were documented.RESULTS: The ENS method provided a mean time benefit of 7.34min compared with the standard method and the mean screw length ratio (SLR coronar: ENS 0.96?0.04mm, SFF: 0.92?0.04mm, P=0.065; SLR sagittal: ENS 0.98?0.02mm, SFF: 0.91?0.04mm, P=0.009) and the screw axis deviation angle (AD coronar: ENS 3.33?2.34?, SFF: 10.33?2.58?, P=0.002; AD sagittal: ENS 2.83?0.98?, SFF: 11.00?6.16?, P=0.002) were lower. Using the electromagnetic navigation procedure no drilling readjustments or restarts were required, no cortical breach occurred.CONCLUSIONS: Compared with the standard fluoroscopic technique, the ENS method used in this study showed higher accuracy, less complications, required less operation and radiation exposure time.

Resumo Limpo

ckground central screw posit scaphoid provid biomechan advantagesmethod prospect random studi six fluoroscop guid six electromagnet navig screw en placement perform human cadav accuraci screw posit determin intraop fluoroscopi exposur time readjust drill direct complet restart complic documentedresult en method provid mean time benefit min compar standard method mean screw length ratio slr coronar en mm sff mm p slr sagitt en mm sff mm p screw axi deviat angl ad coronar en sff p ad sagitt en sff p lower use electromagnet navig procedur drill readjust restart requir cortic breach occurredconclus compar standard fluoroscop techniqu en method use studi show higher accuraci less complic requir less oper radiat exposur time

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