H Esfandiari1, S Amiri2, D D Lichti3, C Anglin4,5. 1. Department of Geomatics Engineering, University of Calgary, 2500 University Dr. NW, Calgary, AB, T2N 1N4, Canada. Hooman.esfandiari@gmail.com. 2. Department of Orthopaedics, University of British Columbia, 3114 - 910 West 10th Avenue, Vancouver, BC, V5Z 1M9, Canada. 3. Department of Geomatics Engineering, University of Calgary, 2500 University Dr. NW, Calgary, AB, T2N 1N4, Canada. 4. Department of Civil Engineering, University of Calgary, 2500 University Dr. NW, Calgary, AB, T2N 1N4, Canada. 5. McCaig Institute for Bone and Joint Health, University of Calgary, 2500 University Dr. NW, Calgary, AB, T2N 1N4, Canada.
Abstract
PURPOSE: The main challenge of intramedullary nail (IM-nail) fixation surgery is to achieve the X-ray shot in which the distal holes of the IM-nail appear as circles (desired view); screw insertion is then performed. Although C-arm X-ray devices are routinely used in IM-nail fixation procedures, the surgeons or radiation technologists (rad-techs) usually utilize them in a trial-and-error manner. This increases both radiation exposure and surgery time. This study addresses the problem by presenting a C-arm-based IM-nail pose recognition method. METHODS: The specific purpose of this study was to develop and validate an automated technique for identifying the current pose of the IM-nail relative to the C-arm. An accuracy assessment is performed to test the reliability of the navigation results. The algorithm starts with a sequential biplanar set of X-ray imagery (acquired from a tracked C-arm) of the distal part of an inserted IM-nail. The image-processing module then extracts features of interest, and a mathematical model incorporates them to calculate the six degree-of-freedom position and orientation parameters of the nail. RESULTS: Translational accuracy was demonstrated to be better than 0.5 mm, rotational accuracy for roll and pitch to be better than 2° and for yaw to be better than 2.5° depending on the separation angle. Computation time was less than 0.5 s. . CONCLUSION: An IM-nail distal locking navigation technique is introduced in this study that leads to more accurate and faster screw placement with a lower consumption of radiation dose and a minimum number of added steps to the operation.
PURPOSE: The main challenge of intramedullary nail (IM-nail) fixation surgery is to achieve the X-ray shot in which the distal holes of the IM-nail appear as circles (desired view); screw insertion is then performed. Although C-arm X-ray devices are routinely used in IM-nail fixation procedures, the surgeons or radiation technologists (rad-techs) usually utilize them in a trial-and-error manner. This increases both radiation exposure and surgery time. This study addresses the problem by presenting a C-arm-based IM-nail pose recognition method. METHODS: The specific purpose of this study was to develop and validate an automated technique for identifying the current pose of the IM-nail relative to the C-arm. An accuracy assessment is performed to test the reliability of the navigation results. The algorithm starts with a sequential biplanar set of X-ray imagery (acquired from a tracked C-arm) of the distal part of an inserted IM-nail. The image-processing module then extracts features of interest, and a mathematical model incorporates them to calculate the six degree-of-freedom position and orientation parameters of the nail. RESULTS: Translational accuracy was demonstrated to be better than 0.5 mm, rotational accuracy for roll and pitch to be better than 2° and for yaw to be better than 2.5° depending on the separation angle. Computation time was less than 0.5 s. . CONCLUSION: An IM-nail distal locking navigation technique is introduced in this study that leads to more accurate and faster screw placement with a lower consumption of radiation dose and a minimum number of added steps to the operation.
Authors: Guoyan Zheng; Xuan Zhang; Daniel Haschtmann; Philippe Gedet; Xiao Dong; Lutz-Peter Nolte Journal: IEEE Trans Med Imaging Date: 2008-02 Impact factor: 10.048
Authors: W J Viant; R Phillips; J G Griffiths; T O Ozanian; A M Mohsen; T J Cain; M R Karpinski; K P Sherman Journal: Proc Inst Mech Eng H Date: 1997 Impact factor: 1.617