Automated Preoperative Planning of Femoral Component for Total Hip Arthroplasty (THA) from 3D CT Images
This paper describes a method for 3D automated preoperative planning of the femoral stem in total hip arthroplasty (THA). The stem planning is formulated as a problem to determine the optimal position, rotation, and size, on the 3D surface model of femur reconstructed from CT images. We obtain the parameters that maximize the fitness between the femoral canal and stem surfaces subject to the positional and rotational constraints. The maximization is performed by local optimization from multiple initial positions. The proposed method was experimentally evaluated by the difference from planning results of an experienced surgeon in 7 cases. The average positional and rotational differences were 1.9 mm and 2.5 deg., respectively, and there was size difference only in 1 case for the proposed method while these differences were 2.8 mm, 5.0 deg., and 5 cases for an existing method. The proposed method showed better performance than the existing method.
Keywordscomputer assisted surgery stem fitness anteversion angle orthopaedic implant
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- 5.Nishihara, S., Sugano, N., Nishii, T., Tanaka, H., Yoshikawa, H., Ochi, A.: Comparison of the fit and fill between the Anatomic Hip femoral component and the VerSys Taper femoral component using virtual implantation on the ORTHODOC workstation. Journal of Orthopaedic Science 8(3), 352–360 (2003)CrossRefGoogle Scholar
- 8.Nakamoto, M., Sato, Y., Sugano, N., Sasama, T., Nishii, T., Pak, P.S., Akazawa, K., Tada, Y., Yoshikawa, H., Tamura, S.: Automated CT-based 3D surgical planning for total hip replacement: a pilot study. International Congress Series, vol. 1256, pp. 389–394 (2003)Google Scholar
- 9.Otomaru, I., Takao, M., Nakamoto, M., Sugano, N., Kagiyama, Y., Sato, Y.: Automated Preoperative Planning System of Total Hip Arthroplasty Using Anatomical Femoral Components. In: 6th Annual Meeting of CAOS-International Proceedings, pp. 419–423 (2006)Google Scholar