The isocentric C-arm

作者：Meier R^*; Geerling J; Huefner T; Kfuri M; Krettek C

来源：Unfallchirurg, 2011, 114(7): 587-590.

DOI：10.1007/s00113-011-2008-8

• Intraoperative imaging
• Wrist
• C-arm image amplifiers
• Radius
• Fovea lunata

In addition to conventional C-arms which can be used for intraoperative imaging, C-arm image amplifiers with an option for three-dimensional imaging (ISO-C3D) are available to visualize reduction of fragments and positions of implants.
In ten cadaver wrists intra-articular steps and intra-articular screw positions were simulated. Images obtained by conventional two-dimensional C-arm image amplifier, computed tomography and ISO-C3D were evaluated by four investigators using a questionnaire. For 2D image amplifier scans the investigators rated the quantity of the articular steps correctly in 45%, incorrectly in 51% and were uncertain in 4%. Concerning CT scans these values were 57, 40 and 3%, respectively. With a slow 190A degrees ISO-C3D mode the investigators rated the steps correctly in 47%, incorrectly in 44% and were uncertain in 9%. The positions of the tip of the screw were rated correctly for 2D scans in 56%, incorrectly in 40% and were uncertain in 4%. For CT screw positions were assessed correctly in 40%, incorrectly in 43% and were uncertain in 17%. For ISO-C3D in fast 190A degrees mode the rating was correct in 59%, wrong in 30% and uncertain in 11%. In the slow Iso-C3D mode the results were inferior with correct assessment in 51%, wrong results in 36% and uncertain evaluation in 13%.
In our cadaveric study, ISO-C3D scans have been found valuable for intraoperative controls of implant positions and assessment of intra-articular steps.

• 出版日期2011-7