Automated Preoperative Planning of Femoral Component for Total Hip Arthroplasty (THA) from 3D CT Images

  • Itaru Otomaru
  • Masahiko Nakamoto
  • Masaki Takao
  • Nobuhiko Sugano
  • Yoshiyuki Kagiyama
  • Hideki Yoshikawa
  • Yukio Tada
  • Yoshinobu Sato
Part of the Lecture Notes in Computer Science book series (LNCS, volume 5128)

Abstract

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.

Keywords

computer assisted surgery stem fitness anteversion angle orthopaedic implant 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2008

Authors and Affiliations

  • Itaru Otomaru
    • 1
  • Masahiko Nakamoto
    • 2
  • Masaki Takao
    • 2
  • Nobuhiko Sugano
    • 2
  • Yoshiyuki Kagiyama
    • 1
  • Hideki Yoshikawa
    • 2
  • Yukio Tada
    • 1
  • Yoshinobu Sato
    • 2
  1. 1.Graduate School of EngineeringKobe UniversityKobeJapan
  2. 2.Graduate School of MedicineOsaka UniversitySuitaJapan

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