JPS62344A - Spacer for correcting high level dislocation - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a spacer used to compensate for subluxation of the hip joint in the human body.

[Conventional technology]

Traditionally, the second technique for correcting subluxation of the hip joint is
Due to the subluxation shown in the figure, that is, the shape of the acetabular cap Q formed in the pelvis K is incomplete, the femoral head ball F is not properly received in the acetabular cap G. As a result, it becomes increasingly difficult to support the body's weight with the femur, and the patient eventually becomes unable to walk. Such acetabular cap Q
To compensate for dislocation due to malformation of Figure 1, the midpoint vAL
After cutting the pelvis K from the position shown in Fig. 2 and expanding it as shown in Fig. 2, cut the pelvis K from the position shown in Fig.
A shaped bone S taken from the fibula and shaped into an optimal shape is interposed as a spacer, and the formed internal space G is filled with crushed bone to compensate for the dislocation.

[Problems with conventional technology]

As mentioned above, since orthopedic bone taken from other parts of the human body is transplanted, the adhesion is good, but bone resorption tends to occur in the direction of load application, and the so-called osteotomy effect of cutting the pelvis K is weak. It has the disadvantage of becoming. In addition, in most cases, the iliac crest was stored starting from the iliac crest, but since the iliac crest is the origin of the gluteus medius muscle, storing it weakens the gluteus medius muscle. As a result, there was a disadvantage that the muscle balance of the lower limbs was disrupted and Trendenburg waves based on Powell's theory were likely to occur.

Measures for Solving Problems] In view of the above-mentioned problems, the present invention provides a compensation spacer made of a ceramic material such as alumina or apatite that is not harmful to living organisms and has high mechanical strength. It is characterized by what it did.

〔Example〕

FIG. 3 shows a compensation spacer l according to an embodiment of the present invention,
This compensation spacer 1 is made of a ceramic material such as alumina or apatite, has a tapered block shape, is located between the bones cut out to compensate for at least the acetabulum 11Q, and is located at least on the surface that comes into contact with the bone. Sawtooth-like unevenness 2 is formed on the surface. The unevenness 2 is not limited to the one shown in the figure, but may be one integrally provided with a plurality of protrusions.In other words, the surface shape should be such that when it comes into contact with the bone, it will not move and will be positioned stably. be. Further, 3 is a through hole made in the spacer 1 made of a ceramic material. An example of how the correction spacer l according to the present invention is used is shown in FIG. 4. By intervening the spacer l between the bones cut in the pelvis, the shape of the acetabulum Q can be restored to its normal shape. , it becomes possible to support the load by the femoral ball F.

Incidentally, in order to more stably fix the spacer 1 which has been inserted by cutting open the pelvis K, a metal wire W is inserted into the through hole 3 from the upper part of the pelvis.
By filling the internal space G with small pieces of autologous bone, the bone will not move or separate from the incised space between the bones. can be achieved. When the repair is complete in this way, a metal wire W is inserted into the pelvis and if it is fixed, the wire W is removed from the body, but at this time, the spacer 1 remains in the pelvis. too,
It doesn't matter if you remove it.

〔Effect of the invention〕

According to the present invention, in order to repair a high dislocation,
Since the spacer that is inserted between the osteotomed bones to compensate for the acetabular cap is made of ceramic material, spacers of any size and shape can be prepared at all times, and this spacer can be It can withstand loads, does not undergo bone resorption (and is not harmful to living organisms, so there is no need to remove it while remaining in the bone), relieving patients from the burden of harvesting autologous bone. , it is possible to avoid damage to the gluteus medius muscle caused by cutting off the iliac crest, making it a great contribution to human welfare.

[Brief explanation of the drawing]

Figure 1 is a front view showing only the hip joint of a human body with acetabular dysplasia, Figure 2 is a front view of the hip joint corrected using a conventional spacer made of autologous bone, and Figure 3 is a front view of the hip joint. FIG. 4 is a perspective view of the spacer according to the embodiment of the invention, and FIG. 4 is a front view of the hip joint showing a state in which the spacer according to the embodiment of the invention has been corrected. K...Pelvis Q...Acetabulum F...Female head 1...Spacer 2...Irregularities 3...Through hole

Claims (3)

[Claims] (1) A spacer for compensating for high dislocations, which is made of a non-toxic ceramic such as alumina or apatite, and is characterized by having contact surfaces for two or more bones. (2) The spacer for compensating for high dislocation as set forth in claim 1, characterized in that the abutment surface is formed with irregularities. (3) Claim 1, characterized in that at least one end is provided with a through hole for passing the wire through.
A spacer for compensating for high dislocations as described in section.