Download PDFOpen PDF in browserFeasibility of Ultrasound-based Scaphoid Bone Model Completion for Surgical Planning5 pages•Published: December 17, 2024AbstractFor computer-assisted percutaneous scaphoid fixation, a patient-specific bone model is required for surgical planning. This bone model is commonly derived from pre- operative computed tomography (CT) or magnetic resonance imaging (MRI) data. We propose an approach for bone model derivation based on intra-operative 3D ultrasound (US) imaging for the cases, where pre-operative diagnostic CT or MRI are not indicated or available. As scaphoid bone surfaces are only partially visible in sonographic images, we employ the Transformer-based AdaPoinTr architecture to incorporate statistical morphological knowledge for the completion of partial bone surfaces extracted from sonographic images. For the generation of datasets, we built a statistical shape model (SSM) based on 85 scaphoid bone models. From this SSM, we generated 12288 full scaphoid models for training. 20 additional scaphoid bone models were used for testing. Partial models for both training and testing were generated by subsampling the full models, mimicking 3D US imaging from a volar probe position. Evaluation of the final trained model on the test subset showed a mean symmetric distance of 0.3 mm between original and completed scaphoid models, with an inference time of 0.2 s per model. We furthermore planned screws based on the completed test models and evaluated their fit for the original models. We found no screw protrusion for any tested model, with a mean safety margin to bone surface of 0.7 mm. This study shows feasibility of our approach for US-based bone model generation; future work may aim at integrating dorsal surface information.Keyphrases: completion, scaphoid, sonography, ultrasound In: Joshua W Giles and Aziliz Guezou-Philippe (editors). Proceedings of The 24th Annual Meeting of the International Society for Computer Assisted Orthopaedic Surgery, vol 7, pages 40-44.
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