Patent ID: 6370418
Filing Date: 2002-04-09
Classification: A61B,A61F,G06T

Abstract:
Method for measuring a position of an implant (1; 15, 15â€²) relative to at least one bone (6; 16) in a body, to which bone the implant is connected, which bone (6; 16) has at least one bone marking (7, 8; 13; 14), and which implant has at least one predetermined identifying mark (4, 5), according to the following steps:A. generating radiation and directing said radiation onto said at least one bone marking and said at least one predetermined identifying mark; B. receiving a radiation image of said at least one bone marking and said at least one predetermined identifying mark; C. determining the position of the implant (1; 15, 15â€²) with respect to the bone (6; 16) using the radiation image received in step B; D. repeating steps A, B, and C over time to determine migration of the implant with respect to said at least one bone; wherein said at least one bone marking comprises an anatomically fixed point (7, 8; 13; 14) on the bone (6; 16) and said determining said position of the implant with respect to said bone is made by establishing the position of said at least one anatomically fixed point with respect to said at least one predetermined identifying mark of said implant.