Radius of curvature of the Taiwanese femur from CT images in comparison to intramedullary nails
Date Issued
2014
Date
2014
Author(s)
Korthmann, Jan
Abstract
Abstract
A mismatch in the radius of curvature between the design of intramedullary nails and the femur bone has been shown by various studies. The curvature of the intramedullary canal itself however has not been looked up on. This study is looking at the intramedullary curvature, only considering the canal itself.
CT images are used to find the center points of the intramedullary canal at each slice to estimate the center of the intramedullary canal. These points are used to calculate the radius of curvature and compare it to nails curvatures. For the experiment a total of 18 specimens are used from 5 female and 13 male bones, out of 3 female and 9 male patients all who are Taiwanese.
The intramedullary canal’s radius of curvature has an average of 884 mm ± 678 mm and the curvature between male and female differs overall. It can be even more specified, specific at the distal, shaft and proximal part of the femur. When comparing the average radius of curvature to the nails used, a miss match of the radius is found. One of the most bowed nails with 1860 mm radius of curvature is much straighter than the average intramedullary canal’s radius. Considering these results the radius of curvature of the nail should be more curved to better fit the average radius of curvature of the Taiwanese femur.
Subjects
骨髓內腔
骨髓內釘
前曲半徑
曲率
股骨
Type
thesis
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