Computer assisted pelvic surgery: registration based on a modified external fixator

Computer Aided Surgery : Official Journal of the International Society for Computer Aided Surgery
T HüfnerC Krettek

Abstract

A fundamental step in Computer Assisted Surgery (CAS) is the registration, when the preoperative virtual data and the corresponding operative anatomy of the region of interest are merged. To provide exact landmarks for anatomical registration, a tubular external fixator was modified. Two intact pelvic bones (one artificial foam pelvis and one cadaver specimen) were used for the experimental setup. Registration was carried out using a standardized protocol for anatomy-based registration in the control group; anatomical registration was achieved using a modified external fixator in the study group. This external fixator had titanium fiducials wedged into the fixator carbon tubes serving as landmarks for paired-point registration. The tubes were used for surface registration. The standard anterior pelvis fixator assembly was augmented with additional bilateral tubes oriented towards the posterior, enabling registration of the sacroiliac areas. The accuracy of registration was checked by "reversed verification", where the examiner used only the screen display to control the virtual position of the pointer tip in relation to selected landmarks. By virtual matching, the real distance was measured with a digital caliper. We defined th...Continue Reading

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Citations

Aug 19, 2006·Der Orthopäde·T HüfnerC Krettek
May 8, 2009·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Brian T FeeleyAndrew D Pearle
Jan 29, 2013·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Iftach HetsroniRobert G Marx
Jul 28, 2015·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Li-Hai ZhangPei-Fu Tang
Jul 16, 2008·Computer Aided Surgery : Official Journal of the International Society for Computer Aided Surgery·T N BoardT Hüfner
Jul 16, 2008·Computer Aided Surgery : Official Journal of the International Society for Computer Aided Surgery·M CitakT Hüfner
Apr 25, 2008·Computer Aided Surgery : Official Journal of the International Society for Computer Aided Surgery·Jens GeerlingTobias Hüfner
Oct 25, 2006·Computer Aided Surgery : Official Journal of the International Society for Computer Aided Surgery·M CitakC Krettek
Aug 4, 2010·Arthroscopy : the Journal of Arthroscopic & Related Surgery : Official Publication of the Arthroscopy Association of North America and the International Arthroscopy Association·Brian T FeeleyAndrew D Pearle
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Mar 13, 2009·The American Journal of Sports Medicine·Brian T FeeleyAndrew D Pearle
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Nov 8, 2006·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Daniel KendoffTobias Hüfner
Apr 7, 2007·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Daniel KendoffTobias Hüfner
Feb 8, 2021·Deutsches Ärzteblatt International·Timo StübigMax Ettinger

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