2024 Fiscal Year Final Research Report
Stem alignment for the long-term stability of cementless stem after total hip arthritis
| Project/Area Number |
21K09254
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 56020:Orthopedics-related
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| Research Institution | Sapporo Medical University |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2025-03-31
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| Keywords | 人工股関節 / 三次元解析 / アライメント / バイオメカニクス / 有限要素解析 |
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| Outline of Final Research Achievements |
The initial fixation of cementless short stems used in total hip arthroplasty (THA) was evaluated using patient-specific three-dimensional models created from computed tomography (CT) images and finite element analysis. A comparison of two different stem designs revealed that micro-motion tended to occur at the proximal and distal ends, and its magnitude and direction varied depending on the type of movement. In addition, in the group with stem subsidence, poor alignment, and insufficient contact were observed, along with larger micro-motion. These findings suggest that instability in initial fixation may be a contributing factor to stem subsidence. This study is the first to demonstrate the utility of three-dimensional analysis for visualizing and quantifying micro-motion, and it is expected to contribute to preoperative planning and prevention of revision surgery.
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| Free Research Field |
整形外科学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究は，三次元ベクトル解析と有限要素法を用いて，セメントレスショートステムの初期固定性を可視化・定量化した初の報告であり，THAにおけるインプラント設置の適正化に新たな視点を提供する学術的意義がある．術中設置アライメントの重要性や，動作様式に応じたマイクロモーションの発生特性を明らかにしたことで，術前計画やナビゲーション手術の精度向上に貢献するとともに，ステム設計やコーティング部位の最適化にも資する．また，術後のリハビリテーション指導や再置換予防への応用も期待され，高齢化社会におけるTHAの長期安定性向上と医療資源の効率的活用に寄与する社会的意義も大きい．
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