Patent ID: 8126536

Claim:
A method for determining a pelvic inlet plane of a pelvic bone, the pelvic inlet plane being defined by the following three points of the pelvic bone: point A denoting a left anterior superior iliac spine; point B denoting a right anterior superior iliac spine; and point C denoting a pubic symphysis, the method comprising: non-invasively determining a position of one of the two points A or B, the other of the two points B or A is unknown; non-invasively determining a position of point C, non-invasively determining a position of each of the following points of the pelvic bone: point D denoting a left posterior superior iliac spine; and point E denoting a right posterior superior iliac spine, and calculating a position of the pelvic inlet plane from the positions of the non-invasively determined point A or B and of points C, D and E, wherein in order to calculate the position of the pelvic inlet plane: a vector between points D and E is displaced parallel to itself so that it passes through the non-invasively determined point A or B, and the pelvic inlet plane is determined as the plane which is defined by a vector between the non-invasively determined point A or B and point C and by the displaced vector starting from the non-invasively determined point A or B which runs parallel to the vector between points D and E.