METHOD AND SYSTEM FOR DETERMINING THE ALIGNMENT OF TWO BONES

摘要

The present invention relates in particular to a method of alignment of a first bone, with a first and a second ends, in relation with a second bone, with a first and a second end, both bones being in a same limb, the first end of said first bone being a part of a distal joint for the first bone, the second end of said second bone being a part of a proximal joint for the second bone, said second end of the first bone and said first end of the second bone constituting a middle joint between both bones, wherein this first bone will be partially cut, in a transversal way, into two segments to form a hinge and wherein a tracker has been attached beforehand to each of two said bone segments.

主权项

1. Method of alignment of a first bone, with a first and a second end, in relation with a second bone, with a first and a second end, both bones being in a same limb, the first end of said first bone being a part of a distal joint for the first bone, the second end of said second bone being a part of a proximal joint for the second bone, said second end of the first bone and said first end of the second bone constituting a middle joint between both bones, optionally an articulation, wherein this first bone will be partially cut, in a transversal way, into two segments to form a hinge and wherein a tracker has been attached beforehand to each of two said bone segments, wherein said method comprises:
placing the two bones in a fixed relative position; pivoting the two bones around said proximal joint and acquiring a point representing a center of rotation of said proximal joint; acquiring a point representing a center of said middle joint, which is the middle of a medial anatomical point and a lateral anatomical point of said middle joint; acquiring a point representing a center of said distal joint, which is the middle of the medial anatomical point and the lateral anatomical point of the said distal joint; cutting partially said first bone into two segments to obtain said hinge; pivoting the two segments of the said first bone around said hinge until reaching a desired alignment between said second bone and said two segments of the first bone, while acquiring relative positions of said three centers and; visualizing alignment of the three joint points in relation to rotation of one segment with respect to the other one around said hinge.