在傳統的全膝關節置換手術中，醫師憑藉本身的臨床經驗進行手術，過程中難以掌握器械之定位精確度，也因此影響手術品質。本研究發展一套非影像式之膝關節置換手術導引系統，整合一光學式定位裝置，再配合傳統手術所使用之手術器械，可以在術中提供手術器械與各個切除面之間的方位關係，並即時顯示於電腦螢幕之中，使醫師能夠據以準確地切削出膝關節的各個切除面，達成正確安裝人工關節之目的。
本研究主要可分為三部份：方位轉換校準、切除面之決定、與手術導引。在方位轉換校準方面，利用膝關節之力學與運動學模型定義股骨與脛骨座標系統，並配合正交向量對應法，求取各座標系統之間的轉換關係。在切除面之決定方面，利用所定義之座標系統，加上量測股骨與脛骨外型上之解剖特徵，決定出各切除面之方位與切除深度。在手術導引方面，將欲切除面與手術器械之空間方位對應關係投影至兩個不同的平面，並即時顯示在電腦螢幕上，以協助醫師正確定位切除規並切削出切除面。
本研究所發展之系統，經過兩次以Sawbone模擬膝關節置換手術的實驗。實驗假設髁間隆凸中點之量測誤差小於3mm，踝關節中心之量測誤差小於5mm，則脛骨近端切除面的角度誤差小於1.15°；若假設膝關節中心之量測誤差小於10mm，則股骨遠端切除面的角度誤差將小於1.86°；又假設內外髁後側的X座標之量測誤差小於2mm，則股骨前後斜切除面的角度誤差小於2.53°。上述定位誤差量可符合實際膝關節置換手術之要求。

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