Surgical navigation system for navigated instrument, has data processing device finding reference point at preset height above tear drop level in preset position and finding position of instrument relative to pelvic bone and point

摘要

The system has a data processing device (4) determining a tear drop level from a position data of a tear drop point at a pelvic bone and from the position data of a pelvic bone level. The device determines a reference point at a preset height above a tear drop level in a preset position towards anterior-posterior direction. The device determines position of a navigated instrument relative to a pelvic bone and to the reference point.