In vivo kinematics of new total ankle arthroplasty using 2D/3D registration

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K09427
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 56020:Orthopedics-related
• Research Institution: Chiba University
• Principal Investigator: Yamaguchi Satohsi 千葉大学, 大学院国際学術研究院, 准教授 (30596953)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 関節動態 / 足関節

Outline of Final Research Achievements

This study compared ankle joint dynamics after an anatomically shaped total ankle arthroplasty with those of the natural ankle using bi-plane fluoroscopy and 2D/3D registration. The fluoroscopic image data were acquired and analyzed from 11 normal subjects and seven patients after total ankle arthroplasty. In the natural ankles, the joint was inverted and internally rotated with ankle plantar flexion. The replaced ankle showed similar kinematic coupling, although the ranges of motions were less than those of the natural ankle, thus reproducing the kinematics of the normal ankle joint. Additionally, the ranges of motion were greater in the seiza and crouching postures than those of the normal dorsi- and plantar flexion.

Free Research Field

整形外科学

Academic Significance and Societal Importance of the Research Achievements

人工足関節置換術の件数は年々増加している。しかし、その術後成績は人工股関節、膝関節と比べはるかに悪い。治療成績を向上させるためには、置換した人工関節が正常の関節と同じように動くことが必要である。本研究では、生体の骨の形状に近い形を持つ新規人工足関節は、正常の足関節に近い動きをすることが明らかになった。よって、この新規人工足関節は、これまでの人工関節よりも良い成績をもたらすことが期待される。本研究の成果は、変形性足関節症患者の痛みを解消し、生活の質より向上させることにより健康寿命の延伸に役立つ。