| 摘要 |
A method for measuring the displacements of a vertebral column includes: an initial step, for each vertebra in a segment, including: detection of an initial orientation of the location marker associated with the vertebra, determination of an initial orientation of a vertebral plane parallel to at least one end plate of the vertebra, and a calculation of a geometric transformation associated with the vertebra correlating the initial orientation of the vertebral plane of the vertebrae with the initial orientation of the location marker associated, and; a step measuring displacement of at least one vertebra, including: detection of the current orientation of the location marker associated with the at least one vertebra, and a calculation of the current orientation of the vertebral plane of the at least one vertebra from the current orientation of the location marker associated and the geometrical transformation associated with the at least one vertebra. |
| 主权项 |
1. A method for measuring the displacements of a vertebral column, the vertebral column having a segment comprising at least one vertebra, each vertebra in the segment having a body delimited by an upper vertebral end plate and a lower vertebral end plate, and each vertebra in the segment having an location marker associated, attached thereto and providing an orientation of the location marker in a global reference frame of a location system, the method comprising:
an initial step, for each vertebra in the segment, comprising:
a detection, in the global reference frame, of an initial orientation of the location marker associated with the vertebra in the segment,a determination, in the global reference frame, of an initial orientation of a vertebral plane parallel to at least one end plate of the vertebra in the segment, anda calculation of a geometric transformation associated with the vertebra in the segment correlating the initial orientation of the vertebral plane of the vertebra in the segment with the initial orientation of the associated location marker, the method further comprising: a step of measuring a displacement of at least one vertebra in the segment, comprising:
a detection, in the global reference frame, of the current orientation of the location marker associated with said at least one vertebra in the segment, anda calculation, in the global reference frame, of the current orientation of the vertebral plane of said at least one vertebra in the segment from the current orientation of the location marker associated and the geometrical transformation associated with said at least one vertebra. |
