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Accuracy Evaluation of Post-Operative 3D Implant Position Based on BI-Planar X-Rays

6 pagesPublished: August 17, 2017


Evaluation of the post-operative implant position is not straightforward given the significant scatter during magnetic resonance imaging (MRI) and computed tomography (CT). In the contrary, bi-planar post operative x-rays are standard of care. Using these bi-planar x-rays, the 3D implant can now be determined when combining these images with 3D implant files and pre-operative CT data. Using data from 20 patients, this paper compares the obtained implant positions to the positions obtained from post-operative CT scans. On average, the differences between both measurement techniques are below 1mm and 1degree for the translational and rotational degrees of freedom respectively. It is therefore concluded that using post-operative x-rays is an effective method to assess the implant position and alignment.

Keyphrases: implant position, 3D evaluation, X-rays

In: Klaus Radermacher and Ferdinando Rodriguez Y Baena (editors). CAOS 2017. 17th Annual Meeting of the International Society for Computer Assisted Orthopaedic Surgery, vol 1, pages 363--368

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