Expertise Modeling for Automated Planning of Acetabular Cup in Total Hip Arthroplasty Using Combined Bone and Implant Statistical Atlases

Authors:
Itaru Otomaru;Kazuto Kobayashi;Toshiyuki Okada;Masahiko Nakamoto;Yoshiyuki Kagiyama;Masaki Takao;Nobuhiko Sugano;Yukio Tada;Yoshinobu Sato
Affiliations:
Graduate School of Engineering, Kobe University,;Graduate School of Engineering, Kobe University,;Medical Center for Translational Research, Osaka University Hospital,;Department of Radiology, Graduate School of Medicine, Osaka University,;The Center for Advanced Medical Engineering and Informatics, Osaka University,;Department of Orthopaedic Surgery, Graduate School of Medicine, Osaka University,;Department of Orthopaedic Medical Engineering, Graduate School of Medicine, Osaka University,;Graduate School of Engineering, Kobe University,;Department of Radiology, Graduate School of Medicine, Osaka University,
Venue:
MICCAI '09 Proceedings of the 12th International Conference on Medical Image Computing and Computer-Assisted Intervention: Part I
Year:
2009

Citing 2
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Abstract

Intraoperative robotic and computer-guided assistances are now commonly used in total hip arthroplasty (THA) for accurate execution of the preoperative plan. Although the preoperative plan to be accurately executed is critical, it is still interactively prepared in a time-consuming and subjective manner. In this paper, atlas-based approach to automated surgical planning of the acetabular cup in THA is described to stabilize its quality as well as reduce its time-consuming nature. Surgeon's expertise is embedded in two types of statistical atlases, which are constructed from training datasets of CT-based 3D plans prepared by experienced surgeons. One is a statistical shape model which encodes global spatial relationships between the patient anatomy and implant. The other is the statistical map of residual bone thickness on the implant surface, which encodes local spatial constraints of the anatomy and implant. Given the 3D pelvis shape of the patient, we formulate a procedure to determine the best size and position of the acetabular cup which satisfy the constraints derived from the two statistical atlases. We validated the proposed planning method by retrospective study using the datasets which were actually used in the THA surgery.