Without attaching separately for the femur markers, methods and apparatus using the surgical navigation system to position the femoral component of the hip during hip replacement surgery. In addition to the rotational center of the hip joint, the navigation system, to capture at least one point on the femur in the pelvic frame of reference. From these two points, the navigation system calculates the position and length of the first line segment between the points on the femur and the center of rotation of the hip joint. Optionally, a second point not on the line segment is first palpated. The system can then be perpendicular to Senmake first, to calculate the position and length of the second line segment that second point is palpated on the femur from the first line segment to run. Artificial cup is implanted, the center of rotation is recorded. Device for forming a hole which is located stem of the femoral implant component is tracked by the navigation system. While the instrument is secured to the femur, the surgeon palpates the same point again on the femur which is already palpation. The navigation system calculates the position and length of the first line segment between the first point is palpated again with the center of rotation of the prosthetic cup. A second point on the femur is palpated again, the navigation system also calculates the position and length of the perpendicular between the second point and the first line segment. The surgical navigation system is displayed to the surgeon information regarding surgery, for example, by calculating the inner of / outside of the joint and / or a change in the length of the lower leg of the patient using this information.マーカを大腿骨に対して別に取り付けることなく、股関節置換手術中に人工股関節の大腿骨コンポーネントを位置決めするための外科ナビゲーションシステムを用いた方法及び装置。このナビゲーションシステムは、股関節の回転中心に加え、骨盤基準系における大腿骨上の少なくとも1つの点を捕捉する。これらの2つの点から、ナビゲーションシステムは、股関節の回転中心と大腿骨上の点との間の第1の線分の位置及び長さを計算する。任意で、第1の線分上にない第2の点が触診される。このシステムは、第1の先負に垂直であって、第1の線分から大腿骨上の触診された第2の点まで走る第2の線分の位置及び長さを計算することができる。人
