Injury
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Navigation procedures based on CT data were introduced into spinal surgery in 1994. Since then, the method has been used in other areas such as joint replacement, reconstructive surgery, and tumor surgery because of its high precision and reduced radiation exposure. The original CT-based spine module can be adjusted for pelvic surgery with the prerequisite that the positioning of the fragments is identical in CT and in the OR; otherwise a new dataset has to be acquired. ⋯ With the ability to reconstruct images, visualization of the acetabulum and the posterior pelvic ring, there is marked an improvement compare to conventional 2-D fluoroscopy. Thus, the field for navigation is also enhanced. Based on our clinical experiences, the indications for navigated techniques in pelvic and acetabular surgery are defined and illustrated.
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Comparative Study Clinical Trial Controlled Clinical Trial
Fluoroscopic guidance versus surgical navigation for distal locking of intramedullary implants. A prospective, controlled clinical study.
A prospective controlled clinical study was performed to compare fluoroscopic guidance with fluoroscopy-based surgical navigation for distal locking of intramedullary implants. Forty-two patients with fractures of the lower extremity treated by intramedullary nailing were divided in two groups: distal locking either with fluoroscopic guidance (group I) or with surgical navigation (group II). The average fluoroscopic time to insert one interlocking screw with fluoroscopic guidance was 108 s compared with 7.3s in the navigation group. ⋯ There was no significant difference in the technical reliability between both groups. Fluoroscopic times to achieve equivalent precision are reduced with fluoroscopy-based surgical navigation compared with fluoroscopic guidance. Fluoroscopy-based surgical navigation is recommended for intraoperative guidance in situations where reduction of exposure to radiation is considered advantageous over the increase of procedure time.
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Computer aided and computer navigated operative techniques have been used for the first time in neurosurgery and surgery of the spine. For computer aided surgery of the spine there are currently two different methods: CT-based and C-arm based techniques. The advantage of the CT-based technique is its accuracy especially in difficult anatomical regions like the cervical and upper thoracic spine, and the possibility of preoperative planning. ⋯ Generally, all methods enhance the precision of pedicle screw insertion. Clinical as well as experimental studies show an exact pedicle screw position using the computer navigated techniques in over 90% of cases. C-arm based navigational techniques are being constantly improved and the future will be CT-like images with instant intraoperative availability.