title: [Effects of medical robot-assisted surgical navigation system in distal locking of femoral intramedullary nails: an experimental study].
abstract: OBJECTIVE
  To investigate the effects of medical robot-assisted surgical navigation system based on fluoroscopic images in distal locking of femoral intramedullary nails.
  
  
  METHODS
  Using a robot-assisted computer-guided system designed based on modularization and minimization that permitted C-arm alignment assistance and real-time navigation control, provided constant feedback without the need for radiologic updates, thus avoiding constant X-ray exposure. The C-arm was used to collect the orthotopic and lateral X-ray images into the computer so as to calculate the locations of the target points. Nails were locked into 5 plastic femurs (Swiss Sybone, 35 holes), 2 dry human femoral specimens (12 holes), and one leg of fresh human cadaver (6 holes). Radiographs were taken to confirm that screws were positioned correctly, and fluoroscopic time associated with the locking procedure was recorded.
  
  
  RESULTS
  All distal holes were locked successfully. In 6 (11.1%) of the 53 holes the drill bit touched the canal of the locking hole, albeit with no damage to the nail. The fluoroscopy time of per screw was 1.83 +/- 0.31 seconds.
  
  
  CONCLUSIONS
  The medical robot-assisted surgical navigation system enables the physicians to precisely navigate surgical instruments throughout the procedure using just a few computer-calibrated radiographic images. The total radiation time per procedure can be significantly reduced because additional X-ray exposure is not required for tool navigation. The idea of a robot-assisted surgical navigation system is practicable.
authors: Department of Orthopaedics and Traumatology, Jishuitan Hospital, Beijing 100035, China. drw-jq1997@163.com
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