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従来型の手術(従来群)とナビゲーション使用手術(ナビ群)のコンポーネント設置角と下肢アライメントの変化を比較検討した.コンポーネント設置角は,β角がとくに正確であった.γ角はナビ群で大きく,ナビ群の大腿骨コンポーネントは屈曲位に設置されていた.従来群の75%,ナビ群の89%の症例が,前額面下肢アライメントで内外反3°以内であり,ナビ群でアライメント良好なものが多かった.しかしながら,手術時間は,ナビ群で約16分の延長があった.
We evaluated component position and coronal alignment after conventional TKA (conventional group) and after computer-assisted TKA (navigation group). The component position (β angle) was especially accurate. The γ angle, was larger in the navigation group, and coronal alignment was better in the navigation group (89% within ±3° varus/valgus versus 75% within ±3° varus/valgus in the conventional group). Computer-assisted surgery was shown to improve the alignment of the implant, however, operation time was about 16 minutes longer in navigation group.
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