Stem of artificial hip joint
A stem of an artificial hip joint is capable of removing a gap that may be formed between a proximal portion of a femur and a backside of the stem. The stem has an upper end portion to face a proximal side and a backside to face a greater trochanter and is adapted for insertion into, and fixation to, a medullary space of a femur. The stem has a through bore opened both to the upper end portion and the vicinity of proximal end of the backside.
1. A stem of an artificial hip joint, the stem having an upper end portion to face a proximal side and a backside substantially perpendicular to the upper end portion to face a greater trochanter and being adapted for insertion into, and fixation to, a medullary space of a femur, the stem having a through bore with a first opening opened to said upper end portion and a second opening opened to said backside such that the first and second openings are substantially perpendicular to each other, wherein the through bore and the first and second openings are aligned, and wherein the first and second openings and the through bore are similarly sized, the stem being shaped and configured such that the second opening is positioned to directly face the greater trochanter when inserted into the medullary space.
2. The stem of an artificial hip joint as recited in claim 1 , wherein said through bore is formed so as to be inclined.
3. The stem of an artificial hip joint as recited in claim 1 , wherein the stem has a number of fine projections formed on its surface to be positioned between a greater trochanter and a small trochanter.
4. A stem of an artificial hip joint, the stem comprising:
an upper end portion;
a rod extending obliquely upward relative to the upper end portion; and
a backside substantially perpendicular to the upper end portion to face a greater trochanter,
wherein the stem is adapted for insertion into, and fixation to, a medullary space of a femur,
the stem further comprising a through bore with a first opening opened to said upper end portion and a second opening opened to said backside such that the first and second openings are substantially perpendicular to each other, wherein the through bore is inclined throughout its length substantially aligned with the rod, and wherein the through bore and the first and second openings are similarly sized, the stem being shaped and configured such that the second opening is positioned to directly face the greater trochanter when inserted into the medullary space.
5. A stem of an artificial hip joint as recited in claim 4 , wherein the stem has a number of fine projections formed on its surface to be positioned between a greater trochanter and a small trochanter.
6. A stem of an artificial hip joint, the stem having an upper end portion to face a proximal side and a backside substantially perpendicular to the upper end portion to face a greater trochanter and being adapted for insertion into, and fixation to, a medullary space of a femur, the stem having a through bore with a first opening opened to said upper end portion and a second opening opened to said backside such that the first and second openings are substantially perpendicular to each other,
wherein the through bore and the first and second openings are aligned, wherein the first and second opening and the through bore are similarly sized, and wherein the stem is without structure that would interfere between the second opening and the greater trochanter when inserted into the medullary space.