Abstract: A method for measuring the displacements of a vertebral column, a vertebra of the column including a location marker attached thereto and providing a location system with an orientation of the location marker, the method including: a detection of an initial orientation of the location marker associated with a vertebra, a 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 with the initial orientation of the location marker, a detection of the current orientation of the location marker, and a calculation of the current orientation of the vertebral plane of the vertebra from the current orientation of the location marker and the geometrical transformation associated with the vertebra.

Abstract: A system for measuring the displacements of a vertebral column having a segment comprising at least one vertebra having a body delimited by an upper vertebral end plate and a lower vertebral end plate, and each vertebra in the segment having a location marker associated, attached thereto and providing a location system with an orientation of the location marker, the system including a localizer configured to detect the initial orientations of the location markers, and a microprocessor configured to determine, for each vertebra, an initial orientation of a vertebral plane parallel to at least one end plate of the vertebra, and to determine the current orientation of the vertebral plane of the vertebra from the current orientation of the location marker associated and the geometrical transformation associated with the vertebra.

Abstract: A method for measuring the displacements of a vertebral column having a segment comprising at least one vertebra having a body delimited by an upper vertebral end plate and a lower vertebral end plate, and each vertebra in the segment having a location marker associated, attached thereto and providing a location system with an orientation of the location marker, the method comprising: a detection of the initial orientations of the location marker; a determination, for each vertebra, of an initial orientation of a vertebral plane parallel to at least one end plate of the vertebra; and a detection, for each vertebra, of the current orientation of the vertebral plane of the vertebra from the current orientation of the location marker associated and the geometrical transformation associated with the vertebra.

Abstract: 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.