JP6206904B2 - Cementless artificial joint - Google Patents
Cementless artificial joint Download PDFInfo
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- JP6206904B2 JP6206904B2 JP2013107351A JP2013107351A JP6206904B2 JP 6206904 B2 JP6206904 B2 JP 6206904B2 JP 2013107351 A JP2013107351 A JP 2013107351A JP 2013107351 A JP2013107351 A JP 2013107351A JP 6206904 B2 JP6206904 B2 JP 6206904B2
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/32—Joints for the hip
- A61F2/36—Femoral heads ; Femoral endoprostheses
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
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- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Materials For Medical Uses (AREA)
- Prostheses (AREA)
Description
本発明は、骨に形成された孔内に挿入され、ボーンイングロースにより骨との結合力を発生させるようにしたセメントレス型人工関節に関する。 The present invention relates to a cementless artificial joint which is inserted into a hole formed in a bone and generates a binding force with bone by bone in-growth.
股関節は、骨盤と大腿骨との間に骨頭と呼ばれるボールジョイント状の骨で接続されている構造を持ち、このために歩行や直立などの人間の基本的な行動が可能となっている。股関節疾患は、これら骨頭や骨盤にある骨頭の受け皿に何らかの障害が発生し、その機能が破綻するものである。人工股関節は、これらの障害を除去し、人間の基本的な行動を復活させるための治療器具の１つである。人工股関節は、主として骨盤に固定されるソケットと、これと協働するヘッドと、ヘッドを大腿骨側に固定するステムとからなる。 The hip joint has a structure in which a ball joint-like bone called a head of bone is connected between the pelvis and the femur, which enables basic human actions such as walking and standing upright. In hip joint diseases, some sort of damage occurs in the receptacles of the bone heads in these bone heads and pelvis, and their functions are broken. A hip prosthesis is one of the therapeutic instruments that removes these obstacles and restores basic human behavior. The artificial hip joint mainly includes a socket that is fixed to the pelvis, a head that cooperates with the socket, and a stem that fixes the head to the femur.
人工股関節は、主としてセメントタイプとセメントレスタイプとの２つに分かれる。セメントタイプは、いわゆるＰＭＭＡ（ポリメタクリル酸）などのポリマーを用いて人工股関節ステムを固定するものである。セメントレスタイプは、主として人間の骨再生能力を生かして、ソケットやステムなどに骨を誘導する表面処理や構造などを施すことで骨と融合させ、セメントなどを使用せずに固定する手法である。 Artificial hip joints are mainly divided into two types, cement type and cementless type. The cement type uses a polymer such as so-called PMMA (polymethacrylic acid) to fix the artificial hip joint stem. The cementless type is a technique that fuses with bone by applying surface treatment or structure that induces bone to sockets, stems, etc. mainly by utilizing human bone regeneration ability and fixing without using cement etc. .
これまでに人工股関節の構成部材の１つであるステムは、主として金属材料で構成されてきた。構成材料は、チタン合金（Ｔｉ−６Ａｌ−４Ｖ）、ＣｏＣｒＭｏ合金やＳＵＳ３１６Ｌなどである。また、近年では、例えば特許文献１に記載のようにＰＥＥＫ（ポリエーテルエーテルケトン）樹脂および炭素繊維材料を用いたステムなども考案されている。これらのステムには、局所的にかかる応力を分散する機構などが設けられている。 So far, a stem, which is one of the constituent members of an artificial hip joint, has been mainly made of a metal material. The constituent material is titanium alloy (Ti-6Al-4V), CoCrMo alloy, SUS316L, or the like. In recent years, for example, as described in Patent Document 1, a stem using a PEEK (polyether ether ketone) resin and a carbon fiber material has been devised. These stems are provided with a mechanism for locally dispersing the stress.
金属材料で構成されたステムは、その材料の特性から人体の骨と比較して弾性率が高い。例えば金属材料の場合、弾性率は１１０ＧＭＰａ（チタン合金）、２１０ＧＰａ（ＣｏＣｒ合金）である。また、最近開発されているＰＥＥＫは１０ＧＰａ程度である。これに対して、人骨（皮質骨）は１０〜３０ＧＰａである。このため、人工関節に置換した場合、元生体とは大幅に異なる材料が生体内に入ってゆくことになる。 A stem made of a metal material has a higher elastic modulus than a human bone due to the characteristics of the material. For example, in the case of a metal material, the elastic modulus is 110 GPa (titanium alloy) and 210 GPa (CoCr alloy). Recently developed PEEK is about 10 GPa. On the other hand, human bone (cortical bone) is 10 to 30 GPa. For this reason, when the artificial joint is replaced, a material significantly different from the original living body enters the living body.
このことは元来異物である人工関節において、さらに力学的な特性が大きく異なる材料を人体中に存在させることになり、治療後の骨の再生に対して、意図した部分でのボーンイングロースを起こすことが難しく、またストレスシールディングなどを発生する原因となりかねない。 This means that the artificial joint, which is originally a foreign body, has a material with significantly different mechanical properties in the human body. It is difficult to wake up and may cause stress shielding.
そこで、本発明においては、骨と同様の力学特性を有するセメントレス型人工関節を提供することを目的とする。 Accordingly, an object of the present invention is to provide a cementless artificial joint having the same mechanical characteristics as bone.
本発明のセメントレス型人工関節は、骨に形成された孔内に挿入され、ボーンイングロースにより骨との結合力を発生させるようにしたセメントレス型人工関節において、多孔体構造を有し、骨と結合する金属製の骨格部と、骨格部の一部を表面に露出させた状態で骨格部が埋め込まれる熱可塑性樹脂製の樹脂部とからなる。 The cementless artificial joint of the present invention is a cementless artificial joint that is inserted into a hole formed in a bone and generates a binding force with bone by bone in-growth, and has a porous structure, It consists of a metal skeleton part that is bonded to the bone and a thermoplastic resin part in which the skeleton part is embedded with a part of the skeleton part exposed on the surface.
本発明のセメントレス型人工関節では、骨格部が多孔体構造を有する金属製であるため、人体の骨と比較して弾性率が高いが、この骨格部が熱可塑性樹脂製の樹脂部に埋め込まれており、この樹脂部を構成する熱可塑性樹脂が常温では弾性率が人体の骨と同程度であるため、人工関節全体として見た場合に弾性率が上昇し、人体の骨と同程度の弾性率を実現できる。また、骨と結合する金属製の骨格部の一部が熱可塑性樹脂製の樹脂部の表面に露出しているため、この露出した金属部分がボーンイングロースを発生させ、骨と結合して一体化する。 In the cementless artificial joint according to the present invention, since the skeleton part is made of metal having a porous structure, the elastic modulus is higher than that of a human bone, but this skeleton part is embedded in a resin part made of a thermoplastic resin. Since the thermoplastic resin constituting this resin part has an elastic modulus similar to that of a human bone at room temperature, the elastic modulus increases when viewed as an artificial joint as a whole, and is comparable to that of a human bone. Elastic modulus can be realized. In addition, since a part of the metal skeleton part that is bonded to the bone is exposed on the surface of the thermoplastic resin part, the exposed metal part generates bone ingrowth and is combined with the bone to be integrated. Turn into.
ここで、骨格部は、力学的異方性を持つ多孔体構造を有することが望ましい。これにより、特定の方向に対する人工関節の弾性率を変化させることが可能となる。 Here, the skeleton part preferably has a porous structure having mechanical anisotropy. Thereby, it becomes possible to change the elastic modulus of the artificial joint with respect to a specific direction.
また、骨格部の多孔体構造領域の気孔率は３０％〜７０％であることが望ましく、より望ましくは５０％〜７０％である。骨格部の多孔体構造領域の気孔率が３０％〜７０％であると、人工関節全体の弾性率を人体の骨と同程度に調整しつつ、一部が熱可塑性樹脂製の樹脂部の表面に露出した際に骨と接触してボーンイングロースを発生させるのに最適である。なお、気孔率が３０％未満の場合には、ボーンイングロースの発生が少なくなり、成長しにくくなる可能性がある。一方、７０％超の場合には、骨格部の多孔体構造領域の機械的な強度を保てなくなる可能性がある。 Further, the porosity of the porous body structure region of the skeleton is preferably 30% to 70%, and more preferably 50% to 70%. When the porosity of the porous structure region of the skeleton is 30% to 70%, the surface of the resin part made of thermoplastic resin is partially adjusted while adjusting the elastic modulus of the entire artificial joint to the same level as that of the human bone It is ideal for generating bone in contact with bone when exposed to water. In addition, when the porosity is less than 30%, the generation of bone inrose is reduced and it may be difficult to grow. On the other hand, if it exceeds 70%, there is a possibility that the mechanical strength of the porous structure region of the skeleton part cannot be maintained.
（１）多孔体構造を有し、骨と結合する金属製の骨格部と、骨格部の一部を表面に露出させた状態で骨格部が埋め込まれる熱可塑性樹脂製の樹脂部とからなるセメントレス型人工関節によれば、骨内に埋入された際に人工関節に掛かる応力に対して、必要とされる強度および弾性率を容易に実現することが可能となり、かつ金属製の骨格部の一部が熱可塑性樹脂製の樹脂部の表面に露出して、この露出した金属部分がボーンイングロースを発生させ、骨と結合して一体化するので、セメントレス型人工関節を実現することが可能となる。 (1) Cement which has a porous structure and is made of a metal skeleton part bonded to bone and a resin part made of a thermoplastic resin in which the skeleton part is embedded with a part of the skeleton part exposed on the surface. According to the loess-type artificial joint, it is possible to easily realize the required strength and elastic modulus against the stress applied to the artificial joint when it is embedded in the bone, and the metal skeleton part. A part of the resin is exposed on the surface of the resin part made of thermoplastic resin, and this exposed metal part generates bone ingrowth and is united with the bone, so that a cementless artificial joint can be realized. Is possible.
（２）骨格部が力学的異方性を持つ多孔体構造を有することにより、特定の方向に対する人工関節の弾性率を変化させて、埋入する骨と同様の特性を持つ人工関節を実現できる。 (2) Since the skeleton has a porous structure with mechanical anisotropy, it is possible to realize an artificial joint having the same characteristics as the bone to be implanted by changing the elastic modulus of the artificial joint in a specific direction. .
以下、本発明のセメントレス型人工関節について、その一実施形態としてのセメントレス型人工股関節用ステムを例に、図面を参照して説明する。図１は本発明の実施の形態におけるセメントレス型人工股関節用ステムの斜視図、図２は右側面図、図３は縦断面図、図４は図２のＡ−Ａ断面図である。 Hereinafter, a cementless artificial joint according to the present invention will be described with reference to the drawings, taking as an example a cementless artificial hip joint stem as an embodiment thereof. 1 is a perspective view of a stem for a cementless artificial hip joint according to an embodiment of the present invention, FIG. 2 is a right side view, FIG. 3 is a longitudinal sectional view, and FIG. 4 is a sectional view taken along line AA in FIG.
図１から図４に示すように、本発明の実施の形態におけるセメントレス型人工股関節用ステム（以下、単に「ステム」という。）１は、主に、骨盤に固定されるソケット（図示せず。）と、これと協働するヘッド１１と共に人工股関節を構成する人工股関節用ステムであり、ヘッド１１を大腿骨１２側に固定するものである。ステム１は、大転子を避けて大腿骨１２の骨端領域から骨幹領域に向けて人工関節手術用ラスプにより形成した窄孔１３に挿入される。 As shown in FIGS. 1 to 4, a cementless artificial hip joint stem (hereinafter simply referred to as “stem”) 1 according to an embodiment of the present invention is mainly a socket (not shown) fixed to the pelvis. )), And a head 11 for cooperating with the head 11, which constitutes an artificial hip joint, which fixes the head 11 to the femur 12 side. The stem 1 is inserted into a stenosis hole 13 formed by an artificial joint surgical rasp from the epiphyseal region of the femur 12 toward the diaphysis region while avoiding the greater trochanter.
ステム１は、純チタンやチタン合金（例えば、Ｔｉ−６Ａｌ−４Ｖ）などの骨の誘導能を持ち、骨と結合する金属製の骨格部２と、骨格部２の一部を表面に露出させた状態で骨格部２が埋め込まれるＰＥＥＫ（ポリエーテルエーテルケトン）樹脂などの熱可塑性樹脂製の樹脂部３とからなり、ヘッド１１からの荷重を導入するためのネック部４、ネック部４を支え荷重を大腿骨１２に伝達するボディ部５、ステム１の挿入を助け、姿勢を保持するためのレグ部６とを有する。 The stem 1 has a bone inductive ability such as pure titanium or titanium alloy (for example, Ti-6Al-4V), and exposes a part of the skeleton part 2 made of metal and a skeleton part 2 that is bonded to the bone to the surface. The neck portion 4 for introducing a load from the head 11 and the neck portion 4 are supported by the resin portion 3 made of a thermoplastic resin such as PEEK (polyetheretherketone) resin in which the skeleton portion 2 is embedded in the state where the head portion 11 is embedded. It has a body part 5 for transmitting a load to the femur 12, and a leg part 6 for assisting the insertion of the stem 1 and maintaining the posture.
骨格部２は、ネック部４を除くボディ部５およびレグ部６においては、少なくとも一部に力学的異方性（マクロヘテロ構造）を持つ多孔体構造を有している。骨格部２の多孔体構造領域の気孔率は任意に設定することが可能であるが、本実施形態においては望ましい範囲である３０％〜７０％としている。気孔率の範囲は、より望ましくは４０％〜５０％である。なお、本実施形態における気孔率とは、骨格部２の任意の断面において、多孔体構造領域のうち気孔領域が占める面積の割合をいう。 The skeleton part 2 has a porous structure having mechanical anisotropy (macroheterostructure) in at least a part of the body part 5 and the leg part 6 excluding the neck part 4. The porosity of the porous structure region of the skeleton part 2 can be arbitrarily set, but in the present embodiment, the porosity is 30% to 70%, which is a desirable range. The range of the porosity is more preferably 40% to 50%. In addition, the porosity in this embodiment means the ratio of the area which a pore area | region occupies among the arbitrary cross sections of the frame | skeleton part 2 among porous body structure areas.
図５および図６は気孔率の測定例を示している。図５に示す例では、骨格部２の多孔体構造領域の任意の縦断面写真から単位格子形状を抽出、二値化し、金属領域が占めるピクセル数から気孔率を算出している。また、図６に示す例では、骨格部２の任意の横断面写真から多孔体構造領域を抽出、二値化し、金属領域が占めるピクセル数から気孔率を算出している。 5 and 6 show examples of measuring the porosity. In the example shown in FIG. 5, the unit cell shape is extracted and binarized from an arbitrary vertical cross-sectional photograph of the porous structure region of the skeleton part 2, and the porosity is calculated from the number of pixels occupied by the metal region. In the example shown in FIG. 6, the porous structure region is extracted from an arbitrary cross-sectional photograph of the skeleton part 2 and binarized, and the porosity is calculated from the number of pixels occupied by the metal region.
また、本実施形態においては、図３に示すように骨格部２のボディ部５およびレッグ部６の部分はトラス構造状となっており、さらにボディ部５の部分は網状のケージにより覆われた構造を有している。このような骨格部２は、マトリックス材料の中に電子ビーム造形することにより得ることが可能である。 Further, in the present embodiment, as shown in FIG. 3, the body portion 5 and the leg portion 6 of the skeleton portion 2 have a truss structure, and the body portion 5 is covered with a mesh cage. It has a structure. Such a skeleton 2 can be obtained by forming an electron beam in a matrix material.
樹脂部３の熱可塑性樹脂は、骨格部２のうちネック部４を除くボディ部５およびレグ部６を覆っているが、ボディ部５においては骨格部２の一部を表面に露出させた状態で覆っている。また、樹脂部３の熱可塑性樹脂は、骨格部２の多孔体構造を形成している孔部２ａの内部にも充填されている。 The thermoplastic resin of the resin part 3 covers the body part 5 and the leg part 6 excluding the neck part 4 in the skeleton part 2, but in the body part 5, a part of the skeleton part 2 is exposed on the surface. Covered with. Further, the thermoplastic resin of the resin part 3 is also filled in the hole 2 a forming the porous structure of the skeleton part 2.
このように、本実施形態においては、骨格部２のうちボディ部５の一部を樹脂部３の表面に露出しているため、この骨格部２の金属が大腿骨１２と接触することでボーンイングロースにより結合力を発生し、大腿骨１２と結合して一体化する。なお、本実施形態においては、レグ部６は大腿骨１２との間に隙間が形成された状態で装着されるため、骨格部２の金属は露出させていないが、一部露出させる構成とすることも可能である。 Thus, in this embodiment, since a part of the body part 5 of the skeleton part 2 is exposed on the surface of the resin part 3, the bone of the skeleton part 2 comes into contact with the femur 12. A binding force is generated by ingrose, and is combined with the femur 12 to be integrated. In the present embodiment, since the leg portion 6 is mounted with a gap formed between the leg portion 6 and the thighbone 12, the metal of the skeleton portion 2 is not exposed, but is configured to be partially exposed. It is also possible.
上記構成のステム１では、骨格部２が多孔体構造を有する金属製であるため、大腿骨１２と比較して弾性率が高いが、この骨格部２が熱可塑性樹脂製の樹脂部３に埋め込まれており、この樹脂部３を構成する熱可塑性樹脂が常温では弾性率が大腿骨１２と同程度であるため、ステム１全体として見た場合に弾性率が上昇し、大腿骨１２と同程度の弾性率を実現できる。そのため、このステム１では、大腿骨１２内に埋入された際にステム１に掛かる応力に対して、必要とされる強度および弾性率を容易に実現することが可能となっており、大腿骨１２と同様の力学特性を有する人工股関節を実現可能である。 In the stem 1 having the above configuration, the skeleton 2 is made of metal having a porous structure, and thus has a higher elastic modulus than the femur 12, but the skeleton 2 is embedded in the resin portion 3 made of thermoplastic resin. Since the thermoplastic resin constituting the resin portion 3 has the same elastic modulus as that of the femur 12 at room temperature, the elastic modulus increases when viewed as the whole stem 1 and is the same as that of the femur 12. The elastic modulus can be realized. Therefore, in this stem 1, it is possible to easily realize the required strength and elastic modulus against the stress applied to the stem 1 when it is embedded in the femur 12. Thus, an artificial hip joint having the same mechanical characteristics as that of No. 12 can be realized.
特に、本実施形態におけるステム１では、骨格部２が力学的異方性を持つ多孔体構造を有することにより、ステム１の変形の際に特定の方向に対する変形抵抗となり、その特定方向に対して見かけ上弾性率が上昇する。したがって、このステム１では、自在に弾性率を変化させて、埋入する大腿骨１２と同様の特性を持つステムを実現できる。また、本実施形態においては、骨格部２の多孔体構造領域の気孔率を３０％〜７０％として、ステム１全体の弾性率を大腿骨１２と同程度に調整しつつ、一部が熱可塑性樹脂製の樹脂部３の表面に露出した際に大腿骨１２と接触してボーンイングロースを発生させるのに最適となるようにしている。 In particular, in the stem 1 according to the present embodiment, the skeleton 2 has a porous structure having mechanical anisotropy, so that when the stem 1 is deformed, deformation resistance in a specific direction occurs. Apparent elastic modulus increases. Therefore, in this stem 1, a stem having the same characteristics as the femur 12 to be embedded can be realized by freely changing the elastic modulus. In the present embodiment, the porosity of the porous structure region of the skeleton 2 is set to 30% to 70%, and the elasticity of the entire stem 1 is adjusted to the same level as that of the femur 12 while a part thereof is thermoplastic. When exposed on the surface of the resin part 3 made of resin, it is optimal to generate bone inrose by contacting the femur 12.
また、前述のようにステム１は、金属製の骨格部２の一部が熱可塑性樹脂製の樹脂部３の表面に露出して、この露出した金属部分がボーンイングロースを発生させ、骨と結合して一体化するので、セメントレス型人工関節用ステムとして機能する。すなわち、本実施形態におけるステム１は、生体および骨に対して機械的にも生物的にも安全な人工股関節用ステムとなる。なお、本実施形態においては、人工股関節を例にとって説明したが、股関節に限らず、同様に他の部位の関節にも適用可能である。 Further, as described above, the stem 1 has a part of the metal skeleton 2 exposed on the surface of the resin part 3 made of thermoplastic resin, and the exposed metal part generates bone inrose, Since they are combined and integrated, they function as a stem for cementless artificial joints. That is, the stem 1 in the present embodiment is an artificial hip joint stem that is mechanically and biologically safe with respect to a living body and bone. In the present embodiment, an artificial hip joint has been described as an example. However, the present invention is not limited to a hip joint, and can be applied to joints in other parts as well.
本発明のセメントレス型人工関節は、骨に形成された孔内に挿入され、ボーンイングロースにより骨との結合力を発生させるようにしたセメントレス型人工関節として有用である。 The cementless artificial joint of the present invention is useful as a cementless artificial joint that is inserted into a hole formed in a bone and generates a binding force with bone by bone in-gulose.
１ セメントレス型人工股関節用ステム
２ 骨格部
２ａ 孔部
３ 樹脂部
４ ネック部
５ ボディ部
６ レグ部
１１ ヘッド
１２ 大腿骨
１３ 窄孔
DESCRIPTION OF SYMBOLS 1 Cementless type artificial hip joint stem 2 Skeletal part 2a Hole part 3 Resin part 4 Neck part 5 Body part 6 Leg part 11 Head 12 Femur 13 Stenosis hole
Claims (3)
多孔体構造を有し、前記骨と結合する金属製の骨格部と、
前記骨格部の一部を表面に露出させた状態で前記骨格部が埋め込まれるＰＥＥＫ樹脂製の樹脂部と
からなるセメントレス型人工関節。 In a cementless artificial joint inserted into a hole formed in a bone and generating a binding force with the bone by bone ingrowth,
A metal skeleton having a porous structure and bonded to the bone;
A cementless artificial joint comprising a resin part made of PEEK resin in which the skeleton part is embedded with a part of the skeleton part exposed on the surface.
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