Abstract
The purpose of our cadaveric study was to develop a CAOS technique for fixation of intertrochanteric fractures employing and validating the accuracy of a table mounted dynamic reference base (DRB). Intertrochanteric femoral fractures were created in cadaveric femurs. One group employed patient mounted DRBs while the second group employed a table mounted DRB. Accuracy of the nail and hip screw guide wire placement was followed using acquired fluoroscopic images. Fluoroscopy was also used to verify placement of the initial stabilizing guide wire and the final implant position in both groups. Mounting the requisite DRB on the table rather than the patient eliminates instrument crowding implant collision and line-of-sight problems frequently encountered with optical tracking. Navigation of the virtual nail allowed the real-time correction of both depth and version of the hip screw without multiple fluoroscopic images. Reductions in radiation dose and surgical time will be realized in this generally technically demanding procedure.
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