• 作者： 鄭誠功; 姚南光; 劉華昌
• 作者服務機構： 國立陽明大學醫學工程研究所; 國立台灣大學電機工程研究所; 國立台灣大學附設醫院骨科
• 中文摘要： 　　　　為了要瞭解人體承重對膝關節接觸運動之影響，十二位正常成人被等分成兩組在膝關節承重與不承重的狀況下接受活體數位化連續性X光攝影，以獲得其膝關節伸直∕彎曲的情形，這些連續性X光影像被進一步數據化得到膝關節的幾何資料及三個參數，這三個參數分別是旋轉半徑、旋轉弧長及股脛骨關節的接觸點，由這三個參數便可以求得膝關節當時接觸運動是滑動、轉動亦或是滾動，研究結果顯示，在承重組的膝關節滑動率是不承重組的四倍，且滑動最常發生於膝關節彎曲角度小於30度，在不承重時膝關節接觸運動較承重時有較多的轉動發生率及較少的滾動發生率，較大的轉動發生率都發生在膝關節彎曲角度大於60度時，所以本研究之結論為自體承重足以影響膝關節之接觸運動。
• 英文摘要： In order to understand the effects of body weight-bearing on knee joint bony contact movements, avideo-fluoroscopic digitizing system with in vivo human knee extension-flexion motions of 12 healthyadults under body weight-bearing and non-weight-bearing conditions was studied. These 12 subjects wereequally separated into two groups consisting of a body weight-bearing group and a non-weight-bearinggroup. Video-fluoroscopic images were digitized to get three parameters from the knee joint bony geom- etry. These three parameters were the radius of rotation, the arc length of rotation, and the contact point ofthe tibiofemoral joint, and they were used to decide the knee joint bony contact status of the sliding,spinning and rocking motions. The results showed that the knee bony contact movements under bodyweight-bearing conditions had about 4 times the incidence rate of the sliding motion under non-weight-bear-ing conditions. The incidence rate of the sliding motion was greatest when the knee flexion was less than30°. 　The knee bony contact movements under non-weight-bearing conditions had a larger spinning motionincidence rate and smaller rocking motion incidence rate than they did under weight-bearing conditions.The larger spinning motion incidence rate when the knee joint flexion was greater than 600. In conclusion,the body weight-bearing factor should be considered in studying knee joint bony contact movements.
• 中文關鍵字： knee joint; bony contact motion; body weight-bearing; video-fluoroscopy; in vivo.
• 英文關鍵字： --