关键词: 胫骨, 矢量化测量, 解剖型假体, 位置关系, 三维CT, 人工假体, 膝关节置换

Abstract:

BACKGROUND: At present, almost all the studies about anatomy of the section of proximal tibia focused on its quantitative relations between transverse diameter and several sagittal diameters but ignored their relative position.
OBJECTIVE: To study the shape design of anatomic prothesis by measuring the vectorial data of tibial sections in Chinese.
METHODS: Twenty-six cases/44 knees with knee osteoarthritis were selected from Haikou People’s Hospital. After harvesting the images of the tibial sections the same as in total knee arthroplasty by CT three-dimensional reconstruction technique, we set up coordinates in them and marked out segments from the center of the coordinates to the edges of the section images per 10°. On the basis of the data got by measuring the lengths of the segments, we guided the shape design of anatomic prosthesis.
RESULTS AND CONCLUSION: The coordinates set up according to the design proposal in the images of tibial sections were feasible and repeatable. From 10°-350°, the length of every segment had dependence with the length of transverse diameter. If we preestablish a length of transverse diameter discretionarily, we can calculate all the lengths of 10°-350° segments through the average ratios of every segments. Marking all the points of those segments’ peripheral region and connecting them with continuous line, we can get the shape of tibial anatomic prosthesis. Measuring the tibial sections vectorially can get the data of the tibial sections and get the corresponding positional relationship, and is significant for the shape design of anatomic prothesis in Chinese.