JP3559216B2 - Tibial reinforcement set - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a tibial augment.
[0002]
[Prior art]
When a tumor is generated or injured in the tibia epiphysis, a treatment for shaving off a part of the epiphysis and disposing an artificial bone or replacing it with an artificial joint is sometimes performed. In such a case, in the past, a part of the epiphysis was cut off at an angle so as to slide down diagonally downward and outward with respect to the direction in which the load acts.
[0003]
[Problems to be solved by the invention]
However, as described above, when the epiphysis is cut obliquely, even if the artificial bone is arranged in accordance with the defect, it is easy to move and it is not easy to firmly fix the artificial bone. .
[0004]
Therefore, an object of the present invention is to provide a tibial augment material set suitable for performing an artificial joint without slipping down.
[0005]
[Means for Solving the Problems]
To achieve the above object, the present invention includes a bone the insertion portion having a single stem of the inverted cone shape, and the bone end surface forming portion, but were sick of integrally formed Rutotomoni tibia by apatite left A tibial augment set comprising a plurality of tibial augments driven into a cut off part of one head, wherein a plurality of the tibial augments are arranged and driven to place an artificial joint. A gradual spherical convex surface or a planar upper surface forming a continuous plane for performing , and further, of the plurality of tibial augmentation materials, the left and right other side of the left unremoved head has a side surface. upper surface of the tibial reinforcement, which are discharged close from circular, portions which correspond to healthy bone, is shall such cut away.
[0006]
Further, the intraosseous insertion section having an inverted quadrangular pyramid-shaped single stem portion, and the bone end surface forming portion, but driven in part formed by cutting the one of the left and right head was sick of integrally formed Rutotomoni tibia by apatite A plurality of tibial augments , comprising a plurality of tibial augments , wherein the tibial abrasions are arranged side by side without gaps and form a square planar shape forming a continuous plane for placing an artificial joint. Has an upper surface.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the tibial augmentation material set of the present invention will be described in detail with reference to the drawings showing the embodiments.
[0008]
1 to 3 are perspective views of a tibial augment showing each embodiment. In these figures, a tibial augment indicated by reference numeral 1 is formed at a lower portion (from one stem portion 12). The intraosseous insertion part 2 and the epiphyseal surface forming part 3 formed on the upper part are integrally formed of apatite having a good affinity for living tissue.
[0009]
Since the intraosseous insertion portion 2 is inserted into the tibia 4 (see FIGS. 4A, 4B, and 4C) and fixed, the tip is formed to have a pointed shape. Further, since strength is required, it is preferable that the inside is formed of dense apatite and the outside is formed of porous apatite.
[0010]
On the other hand, the upper surface 30 of the epiphysis forming part 3 is formed in a planar shape and forms a plane for placing an artificial joint. Therefore, since sufficient rigidity is required, it is desirable that the upper surface 30 and its vicinity are formed of dense apatite.
[0011]
By the way, in the present invention, apatite is defined as a calcium phosphate-based sintered body in a broad sense. Among them, hydroxyapatite is excellent in strength and is the most preferable material. The dense body has a porosity of 0 to 20%, and the porous body has a porosity of 60 to 80%.
[0012]
If the porosity of the dense body exceeds 20%, the strength is significantly reduced, which is not preferable. Further, when the porosity of the porous body is less than 60%, it takes too long to be replaced with bone. If the porosity exceeds 80%, the strength is reduced, and the porosity may be damaged.
[0013]
The tibial augment 1 shown in FIG. 1 is formed small so that a plurality of tibial augments can be used in combination, the whole is a slightly elongated quadrangular pyramid, and the upper surface 30 of the epiphysis forming section 3 has a square shape. It has a flat planar shape. In such a treatment using the tibial augment 1, for example, treatments shown in FIGS. 4A, 4B, and 4C can be taken.
[0014]
That is, first, as shown in FIG. 4A, the right head 41 indicated by hatching of the tibia 4 (to be deleted due to injury) is resected, and then, as shown in FIG. A plurality of tibial augment materials 1 are driven into the portion, and the upper surfaces 30 of the epiphysis forming portions 3 are arranged to form a continuous plane 31.
[0015]
Then, as shown in FIG. 4 (C), a part of the left head 42 is also cut flat by making the height level coincide with the continuous plane 31 of each of the epiphysis forming parts 3. , New planes 421 are formed to secure a wide flat plane 5. The artificial joint 10 is placed on the plane 5.
[0016]
In the intraosseous insertion part 2 driven into the tibia 4, the porous apatite on the surface is promptly replaced with bone, and the strength is secured by the dense apatite inside. It is firmly fixed to the site, and the occurrence of a defect such as moving after surgery as in the conventional case is insignificant .
[0017]
When such a small tibial augment 1 is used, there is an advantage that the number can be flexibly adjusted by appropriately adjusting the number of shots according to the size of the cut portion. In addition, depending on the symptoms, it may be used alone or in combination with other tibial reinforcing materials 1 described below.
[0018]
In the tibial augment 1 shown in FIG. 2, the side wall is formed in an inverted conical shape slightly narrowed, and a gentle spherical convex shape or a planar shape is formed on the pointed intraosseous insertion portion 2 (stem portion 12). The epiphyseal surface forming part 3 having the upper surface 30 is integrally formed.
[0019]
In the tibial augment 1 shown in FIG. 3, a part of the epiphysis forming portion 3 is cut out for a healthy bone, and in this case, the cut-out portion is left without being resected. The left head 42 (see FIG. 4A) of the tibia is made to correspond.
[0020]
【The invention's effect】
(According to claim 1) Since the intraosseous insertion portion 2 and the epiphyseal surface forming portion 3 are integrally formed of apatite, the affinity with the living tissue is good, there is no sense of incongruity, and the durability is good. In addition, since the intraosseous insertion portion 2 is driven into the tibia 4, it is firmly fixed in a stable posture without moving.
Further, since the upper surface 30 of the epiphysis forming section 3 is formed in a gentle spherical convex shape or a flat shape, the artificial joint can be stably mounted thereon.
[0021]
In addition, since the continuous plane 31 is formed by the upper surfaces 30 of the epiphysis forming portions 3 of the plurality of tibial augments 1, it is possible to secure an optimal artificial joint placement area according to the symptoms. .
In addition, since a part of the upper surface 30 of the epiphysis forming portion 3 is cut out to accommodate a healthy bone, the head of the tibia can be left partially, and the tibia can be securely attached without wasteful gap.
Furthermore, since the upper surface 30 (plane 31) forms a plane for placing an artificial joint, it is not necessary to separately form a plane for placing an artificial joint.
[0022]
(According to claim 2) Since the intraosseous insertion portion 2 and the epiphyseal surface forming portion 3 are integrally formed of apatite, the affinity with the living tissue is good, there is no sense of incongruity, and the durability is good. In addition, since the intraosseous insertion portion 2 is driven into the tibia 4, it is firmly fixed in a stable posture without moving.
Further, since the upper surface 30 of the epiphysis forming section 3 is formed in a flat shape, the artificial joint can be stably mounted thereon.
[0023]
In addition, since the continuous plane 31 is formed by the upper surfaces 30 of the epiphysis forming portions 3 of the plurality of tibial augments 1, it is possible to secure an optimal artificial joint placement area according to the symptoms. .
In addition, since the upper surface 30 is a square flat surface, the tibia can be securely attached without any unnecessary gap, leaving a part of the head of the tibia.
Furthermore, since the upper surface 30 (plane 31) forms a plane for placing an artificial joint, it is not necessary to separately form a plane for placing an artificial joint.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a tibial augment of the present invention.
FIG. 2 is a perspective view showing another embodiment.
FIG. 3 is a perspective view showing another embodiment.
FIG. 4 is an explanatory diagram of a treatment.
[Explanation of symbols]
1 tibial stiffener 2 intraosseous insertion portion 3 epiphysis face forming portion 4 shin bone
10 Artificial joint
12 Stem
30 Top
31 plane
41 Head (left or right)
42 (of the other of the left and right) head section

Claims (2)

The intraosseous insertion portion 2 having an inverted cone shape single stem portion 12 of the bone end surface forming portion 3, but were excised one head 41 right and left and sick integrally formed Rutotomoni tibia 4 by apatite portion A plurality of tibial augments 1 driven into the tibial augment ,
The tibial augment 1 has a gentle spherical convex or planar upper surface 30 that forms a continuous planar surface 31 for placing the artificial joint 10 by being arranged and driven in plurals ,
Furthermore, the upper surface 30 of the tibial augment 1 that is driven into close proximity to the side surface of the other left and right head 42 that has not been cut out of the plurality of tibial augments 1 corresponds to a healthy bone from a circular shape. part for the tibia reinforcements set characterized in that it is notched. Conversely four bone the insertion portion 2 having the pyramid-shaped single stem portion 12 of the bone end surface forming portion 3, but were excised one head 41 right and left were sick of integrally formed Rutotomoni tibia 4 by apatite A tibial augment set comprised of a plurality of tibial augments 1 driven into the part ,
The tibial augment 1 is characterized in that it has a square, planar upper surface 30 which is arranged without gaps and forms a continuous plane 31 for placing the artificial joint 10 thereon. set.

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