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Computer-aided surgical systems commonly use preoperative CT scans whenperforming pelvic osteotomies for intraoperative navigation. These systems havethe potential to improve the safety and accuracy of pelvic osteotomies,however, exposing the patient to radiation is a significant drawback. In orderto reduce radiation exposure, we propose a new smooth extrapolation methodleveraging a partial pelvis CT and a statistical shape model (SSM) of the fullpelvis in order to estimate a patient's complete pelvis. A SSM of normal,complete, female pelvis anatomy was created and evaluated from 42 subjects. Aleave-one-out test was performed to characterise the inherent generalisationcapability of the SSM. An additional leave-one-out test was conducted tomeasure performance of the smooth extrapolation method and an existing"cut-and-paste" extrapolation method. Unknown anatomy was simulated by keepingthe axial slices of the patient's acetabulum intact and varying the amount ofthe superior iliac crest retained; from 0% to 15% of the total pelvis extent.The smooth technique showed an average improvement over the cut-and-pastemethod of 1.31 mm and 3.61 mm, in RMS and maximum surface error, respectively.With 5% of the iliac crest retained, the smoothly estimated surface had an RMSsurface error of 2.21 mm, an improvement of 1.25 mm when retaining none of theiliac crest. This anatomical estimation method creates the possibility of apatient and surgeon benefiting from the use of a CAS system and simultaneouslyreducing the patient's radiation exposure.

Pelvis Surface Estimation From Partial CT for Computer-Aided Pelvic Osteotomies