• Title/Summary/Keyword: Posterior Slope Angle (PSA)

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Effect of Anteromedial Cortex Oblique Angle on Change of Tibial Posterior Slope Angle in High Tibial Osteotomy Using Computer Assisted Surgery (CAS) (Computer Assisted Surgery(CAS)를 이용한 개방형 근위경골절골술 시 전내측피질골경사각이 경골후방경사각에 미치는 영향)

  • Lee, Ho-Sang;Kim, Jay-Jung;Wang, Joon-Ho;Kim, Cheol-Woong
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.36 no.3
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    • pp.351-361
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    • 2012
  • The leading surgical method for correcting the misalignment of the varus and valgus in the knee joint is the high tibial osteotomy (HTO). In the opening wedge HTO (OWHTO), there is no concern about damaging the peroneal nerve on the lateral tibia of the proximal fibula. OWHTO has been the preferred choice, as the opening of the correction angle can be modulated during the operation. The correction of the varus and valgus on the coronal plane are performed adroitly. Nevertheless, there have been numerous reports of unintended changes in the medial tibial plateau and posterior slope angle (PSA). The authors have developed an HTO method using computer-assisted surgery with the aim of addressing the abovementioned problems from an engineer's perspective. CT images of the high tibia were reconstructed three-dimensionally, and a virtual osteotomy was performed on a computer. In addition, this study recommends a surgical method that does not cause changes in the PSA after OWHTO. The results of the study are expected to suggest a clear relationship between the anteromedial cortex oblique angle of each patient and the PSA, and an optimal PSA selection method for individuals.

Effect of Tibial Cut Planes and Hinge Axes on Medial Opening Wedge High Tibial Osteotomy (내측개방형 근위경골절골술의 경골절단면 및 경골개방축의 설정에 따른 영향)

  • Park, Byoung-Keon;Lee, Ho-Sang;Kim, Jay-Jung;Kim, Cheol-Woong
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.35 no.8
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    • pp.835-846
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    • 2011
  • In medial opening wedge high tibial osteotomy (OWHTO), researchers have reported critical problems caused by unexpected changes in the tibial posterior-slope angle. This unexpected change can be analyzed, but there is no general solution for cases with an oblique hinge axis and cut plane. We propose a general analysis model for OWHTO. We first evaluate the effects according to variation in the hinge axis and tibial cut plane and then define an ideal correction axis. This ideal axis, called the virtual tibial correction axis, is not on the tibial cut plane in general. In this paper, we also present an evaluation of feasibility of the proposed analysis model.