A non-invasive biplanar radiographic technique for in-vivo determination of ligament lengths is presented. By taking biplanar X-rays of a human subject joint and locating the images of prominent bony reference points on the films, the three-dimensional locations of these points are determined. A unique scaling method is employed that compares the coordinates of the reference points with those previously obtained from a cadaver. Scaling equations that describe the subject joint in terms of the cadaver joint allow reference points to be clearly visible in only one X-ray view. The origin and insertion of ligament points from the cadaver are mapped onto the subject’s joint and the ligament length is taken as the distance between the two. An application of this technique to the human knee joint is presented.
|Original language||English (US)|
|Number of pages||7|
|Journal||Proceedings of SPIE - The International Society for Optical Engineering|
|State||Published - Jul 12 1983|