應用電腦放射成像(computed radiography, CR)及數位放射成像(digital radiography, DR)系統之下肢骨負重X光 長片影像，對台灣人下肢骨進行機械軸向與解剖軸向的精準計算，以提供全膝關節置換術準確的術前評估。對50 例台灣成年男性與50例台灣成年女性受試者的下肢軸線進行電腦放射成像及數位放射成像下肢負重X光影像的 測量。男性受試者的平均年齡為26.7歲，女性受試者的平均年齡為24.2歲。台灣人受試者脛骨平台的内側傾角， 數位放射成像女性為3.23±1.60度，男性為3.64±1.39度；電腦放射成像女性為2.30±2.07度，男性為3.03±1.32度， 接近一般文獻報告的3度。數位放射成像台灣女性的下肢平均内翻為1.57±1.00度，男性平均内翻為1.18±0.89度； 電腦放射成像台灣女性的下肢平均内翻為1.80±0.79度，男性平均内翻為0.98±0.82度。電腦放射成像與數位放射 成像評估下肢力線的膝關節内側傾角與下肢内翻角度的符合度趨近於0，代表兩者用來評估下肢力線並無差異。 準確地理解和建立精確的下肢力線是人工膝關節置換術的最基本也是最重要的概念，而運用DR及CR負重X光 下肢拼接攝影得到的下肢全長所測量的力線是可靠的。

This study accomplishes a precise calculation of the full-length weight-bearing radiographs from mechanical or anatomical axis of Taiwanese lower limb via computed radiography, CR, or digital radiography, DR system. This is done to provide a quantitative evaluation for total knee arthroplasty. Fifty men and women were included to acquire the complete medical imaging for analysis. The average of male and female was 26.7 and 24.2, respectively. Average of the medial inclination of tibial plateau for male and female was calculated as 3.03±1.32,2.30±2.07 by CR and 3.64±1.39, 3.23±1.6 by DR, respectively. The results agree to most reported data as 3.0 in average. Average of the varus for Taiwanese male and female lower limb was 0.98±0.82, 1.8±0.79 by CR and 1.18±0.89, 1.57±1.0by DR, respectively. Thus, no significant difference was found between DR and CR in evaluating the quantitative data, since the discrepancy among medial inclination of tibial plateau or varus reached 0 in reality. It was essential to precise evaluate the full-length weight-bearing radiographs before taken any surgical operation and either CR or DR can provide reliable information from clinical viewpoint.