Development And Application Of The Parallel Intelligent Reduction System Of Fractures On The Basis Of Stewart Platform

Background:Long bone fractures take a major part in trauma centers. Conventional ORIF technique contributes to most fracture healing problems, like delayed union, nonunion, malunion, pseudarthrosis. Closed fracture reduction and minimally invasive technique is a leading method in avoiding healing problem in lack of visualization and sufficient accuracy, which is a challenging task. Computer-assisted fracture reduction a newly developed technique that could minimize potential complications and pitfalls associated with fracture reduction and fixation. A novel hexapod computer-assisted fracture reduction system based on 3D-CT image reconstruction and process was introduced for closed reduction of long-bone diaphyseal fractures on the basis of the Stewart platform. So far we have finished a feasibility experiment on bovine femora and a randomized control experiment on human cadaver femora is being on.Method:A novel hexapod computer-assisted fracture reduction system based on 3D-CT image reconstruction and process is presented for closed reduction of long-bone diaphyseal fractures. A new-upgraded mechanical structure and the custom-written algorithms are introduced. The whole system is validated.Results:Ten bovine femoral fracture models were enrolled with random fracture pattern. Tests results are as follows:the residual deviation is 1.24+0.65mm of the axial deflection,1.19+0.37mm of the translation,2.34+1.79°of the angulation,2.83+0.9°of the rotation.Conclusion:The reduction mechanism has the advantages of high positioning, reduction and computer accuracy, intra-operative stability, low radiation exposure for both patients and surgical team. With further investigations, it would be applied in the all kinds of long-bone diaphyseal fractures.