(12) United States Patent
`US 9,265,612 B1
`(10) Patent N0.:
`
`(45) Date of Patent: Feb. 23, 2016
`Lyren
`
`USOO9265612B1
`
`HIP IMPLANT WITH POROUS BODY
`
`(54)
`
`(71)
`
`Applicant: Philip Scott Lyren, Bangkok (TH)
`
`(72)
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`Inventor: Philip Scott Lyren, Bangkok (TH)
`
`5,018,285 A
`5,496,375 A
`5,658,352 A *
`
`5/1991 Zolman et a1.
`3/1996 Sisk et a1.
`8/1997 Draenert
`
`............ A61B 17/8808
`623/22.4
`3/2002 Al-Hafez .................. A61F 2/32
`623/2215
`2004/0243246 A1* 12/2004 Lyren ......................... 623/2211
`
`6,361,566 B1*
`
`(*)
`
`Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 40 days.
`
`FOREIGN PATENT DOCUMENTS
`
`W0
`
`W0 9613230 A1 *
`
`5/1996
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`.......... A61F 2/30767
`
`(21)
`
`Appl. No.: 13/947,069
`
`(22)
`
`Filed:
`
`Jul. 21, 2013
`
`Related US. Application Data
`
`(63)
`
`Continuation of application No. 11/409,611, filed on
`Apr. 24, 2006, now Pat. No. 8,506,642, which is a
`continuation of application No. 10/446,069, filed on
`May 27, 2003, now abandoned.
`
`Int. Cl.
`
`(51)
`
`(52)
`
`(58)
`
`(56)
`
`A61F2/36
`A61F 2/30
`US. Cl.
`
`(2006.01)
`(2006.01)
`
`CPC ............. A61F2/3609 (2013.01); A61F2/3601
`(2013.01); A6IF 2002/30013 (2013.01); A6IF
`2002/3652 (2013.01)
`
`Field of Classification Search
`CPC ................ A61F 2002/3625; A61F 2002/3631;
`A61F 2002/3652; A61F 2/3662; A61F
`2002/3678
`USPC ............ 623/2315, 232672336, 23.29, 23.5,
`623/2353, 55
`See application file for complete search history.
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`
`3,906,550 A
`5,013,324 A
`
`9/1975 Rostoker et a1.
`5/1991 Zolman et a1.
`
`OTHER PUBLICATIONS
`
`Zimmer, “Versys Collared Fiber Metal Midcoat Hip Prosthesis”
`2001.
`
`Zimmer, “Versys Fiber Metal Taper Hip Prosthesis” 1997.
`Zimmer, “Versys Fiber Metal Midcoat and Beaded Midcoat Hip
`Prosthesis” 2001.
`
`Zimmer, “Versys Collared Extra Extended Fiber Metal Midcoat Hip
`Prosthesis” 2002.
`
`Zimmer, “Versys Collarless Fiber Metal Midcoat Hip Prosthesis”
`2002.
`
`* cited by examiner
`
`Primary Examiner 7 Yashita Sharma
`Assistant Examiner 7 Daniel Bissing
`
`(57)
`
`ABSTRACT
`
`A hip implant having two distinct bodies, a neck body and a
`bone fixation body. The neck body is formed from a solid
`metal and has an interface for connecting to a femoral ball.
`The bone fixation body has an elongated shape and is formed
`as a porous structure that is inserted into an intramedullary
`canal of a patient.
`
`19 Claims, 3 Drawing Sheets
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`ZIMMER EXHIBIT 1001
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`ZIMMER EXHIBIT 1001
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`US 9,265,612 B1
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`1
`HIP IMPLANT WITH POROUS BODY
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`CROSS-REFERENCE TO RELATED
`APPLICATIONS
`
`This application claims priority to and is a continuing
`application ofUS. patent application having Ser. No. 1 1/409,
`61 1 filed on 24 Apr. 2006 which is a continuing application of
`US. patent application having Ser. No. 10/446,069 filed on
`27 May 2003, which are incorporated herein by reference.
`
`FIELD OF THE INVENTION
`
`The disclosure herein generally relates to hip implants for
`osseointegration into bone and, more particularly, to hip
`implants having a porous body.
`
`BACKGROUND OF THE INVENTION
`
`Much effort has been directed to integrating hip implants
`into surrounding bone. Ideally, a hip implant would be placed
`into the femur, and thereafter bone would readily grow into
`the surface of the implant. To achieve this objective, many
`different surface technologies have been applied to hip
`implants. In some instances, the surface of the implant is
`roughened, grit-blasted, plasma-sprayed, or microtextured.
`In other instances, the surface is coated with a biological
`agent, such as hydroxylapatite (known as HA). In all of these
`instances, the goal is the same: Produce a surface on the hip
`implant into which surrounding bone will grow or bond.
`Porous coatings have also been applied to surfaces of hip
`implants. These coatings are advantageous since bone will
`indeed grow into a portion of the outer most surface of the
`implant. Osseointegration, to a limited extent then, has been
`achieved with porous coated surfaces. These surfaces though
`are far from ideal in terms of accepting and encouraging bone
`growth into the body of the implant.
`As one disadvantage, porous surfaces are often thin coat-
`ings applied to the metallic substrate of the implant. Bone
`surrounding the implant can only grow into the thin coating
`itself. Bone cannot grow through the coating and into the
`metallic substrate. The depth of bone growth into the implant
`is limited to the depth of the porous coating. Bone simply
`cannot grow completely through the implant or deeply into
`the body of the implant.
`It therefore would be desirable to have a hip implant that
`offers optimum anchoring in bone with bone growth into a
`porous body.
`
`SUMMARY OF THE INVENTION
`
`The present invention is directed toward a femoral hip
`implant for integrating with surrounding bone. In one exem-
`plary embodiment, the implant includes two separate and
`distinct bodies, a neck body and a bone fixation body.
`Together, these bodies form a complete femoral hip implant.
`The neck body is located at the proximal end ofthe implant
`and includes an interface adapted to connect with a femoral
`ball component. In an exemplary embodiment, this interface
`comprises an elongated cylindrical shaft or neck adapted to
`matingly engage with a cylindrical recess in the femoral ball
`component.
`In one exemplary embodiment, the neck body is formed of
`a solid metal piece, such as titanium, titanium alloy, or other
`metals or alloys suitable for a hip prosthesis. The body is
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`formed from a machining process and has a base portion that
`may comprise a collar. The neck extends outwardly away
`from the base portion.
`The bone fixation body is formed ofa porous metal, such as
`titanium or other metals or alloys suitable for a hip prosthesis.
`In one exemplary embodiment, the body is formed with a
`sintering process, is completely porous, and does not include
`a metal substrate. In cross section then, the body has a porous
`structure with no solid metal substrate.
`
`The neck body (formed of solid metal) and the bone fixa-
`tion body (formed of a completely porous structure) are per-
`manently connected together. When connected, the two bod-
`ies form a hip implant. In one exemplary embodiment, these
`two bodies are connected with a sintering process.
`In one exemplary embodiment, the bone fixation body
`portion of the hip implant is completely porous. This porous
`structure extends entirely through the body of the implant
`along the region where the implant engages femoral bone. As
`such,
`the depth of bone growth into the implant is not
`restricted to a thin porous coating. Instead, bone can grow
`deeply into the body of the implant or completely into and
`even through the body of the implant. The implant, then, can
`become fully integrated into surrounding bone with the struc-
`ture of bone dispersed throughout the body of the implant.
`In one exemplary embodiment, the geometric structure of
`the porous body may be shaped and sized to emulate the shape
`and size of natural bone surrounding the implant. Specifi-
`cally, the porous structure of the bone fixation body thus
`replicates the porous structure of natural bone itself. The
`porous structure, thus, readily accepts and encourages sur-
`rounding bone to grow into and even through the body of the
`implant.
`In one exemplary embodiment, the bone fixation body may
`be doped with bone growth agents to enhance and stimulate
`bone growth. These agents can be placed throughout the bone
`fixation body so bone grows deeply into the implant or com-
`pletely through the implant. Bone growth, as such, is not
`restricted to the surface of the implant.
`As noted, the porous structure of the implant enables bone
`to grow deeply into or completely through the implant itself.
`Growth deep into the body of the implant provides an
`extremely strong interface between the implant and surround-
`ing natural bone. As such, the likelihood that the implant will
`loosen is greatly reduced. Further,
`the overall
`long-term
`acceptance of the implant in the bone is increased. Further
`yet, the porous structure ofthe bone fixation body reduces the
`overall weight of the hip implant.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`FIG. 1 is a side view of one embodiment of a hip implant of
`an exemplary embodiment of the present invention.
`FIG. 2 is a cross-sectional view of the implant of FIG. 1
`embedded in the intramedullary canal of a femur.
`FIG. 3 is a side view of another exemplary embodiment of
`a hip implant of the present invention.
`FIG. 4 is a cross-sectional view of FIG. 3 showing the hip
`implant embedded in the intramedullary canal of a femur.
`FIG. 5 is a side cross-sectional view of yet another exem-
`plary embodiment of a hip implant of the present invention.
`FIG. 6 is a side view ofyet another exemplary embodiment
`of the present invention.
`FIG. 7 is a top view of a horizontal cross section of an
`exemplary embodiment of the present invention.
`FIG. 8 is a top view of a horizontal cross section of another
`exemplary embodiment of the present invention.
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`US 9,265,612 B1
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`3
`FIG. 9 is a top view of a horizontal cross section of yet
`another exemplary embodiment of the present invention.
`
`DETAILED DESCRIPTION
`
`Referring to FIGS. 1 and 2, a hip implant 10 is shown
`according to an exemplary embodiment of the invention.
`Implant 1 0 is preferably constructed ofa biocompatible mate-
`rial such as titanium, titanium alloy, or other metals or alloys
`suitable for a hip prosthesis. Implant 10 comprises two pri-
`mary components or bodies, a neck body 14 and a bone
`fixation body 16.
`The neck body 14 is located at the proximal end 18 of the
`hip implant 10 and functions to connect the hip implant 10 to
`a spherically shaped femoral ball 19 and acetabular compo-
`nent (not shown). The neck body extends from a flat or planar
`distal end surface 21 to a proximal end surface 23. Further, the
`neck body has a base portion 20 that includes a collar 22
`adapted to seat against a resected or end portion ofa femur. An
`interface is adapted to connect the neck body to the femoral
`ball. A neck portion 24 extends outwardly from the base
`portion 20. This neck portion has a short cylindrical configu-
`ration and has an end 26 with a slight taper. This end 26 is
`adapted to be received in a correspondingly shaped and sized
`cylindrical recess 30 in the femoral ball 19. Together, end 26
`and recess 30 form a Morse taper connection.
`Preferably, the neck body 14 is formed of a biocompatible
`metal, such as a solid metal piece of titanium, titanium alloy
`or other metals or alloys suitable for a hip prosthesis. The
`body can be machined to have a size and shape shown in the
`figures or other sizes and shapes adapted for use as a hip
`implant.
`The bone fixation body 16 has an elongated tapering shape
`that extends from a flat or planar proximal end surface 40 to a
`rounded distal end surface 42. The distal end surface 21 of
`
`neck body 14 connects or fuses to the proximal end surface 40
`of the bone fixation body 16 at a junction 44.
`In the exemplary embodiments of FIGS. 1 and 2, bone
`fixation body 16 is formed from a porous metal, such as
`titanium. The body has a completely porous structure that
`extends throughout the entire body from the proximal end
`surface 40 to distal end surface 42. Specifically, as shown in
`FIG. 2, body 16 does not include a solid metal substrate.
`FIG. 2 shows the implant 10 embedded in a femur 50 of a
`patient. In this embodiment, the implant is embedded into the
`intramedullary canal 52 of the femur. The length of the bone
`fixation body 16 extends along the region where the implant
`contacts surrounding bone. As shown, the collar 22 seats
`against a resected end 56 ofthe femur above an entrance 57 to
`the intramedullary canal 59. In this embodiment, the bone
`fixation body 16 extends into the intramedullary canal, and
`the neck body 14 extends outwardly from the resected end of
`the intramedullary canal and femur. Further, the proximal end
`surfaced 40 is adjacent the entrance 57 to the intramedullary
`canal.
`
`As noted, the bone fixation body 16 has a porous structure
`that extends throughout the body from the proximal end sur-
`face to the distal end surface. By “porous,” it is meant that the
`material at and under the surface is permeated with intercon-
`nected interstitial pores that communicate with the surface.
`The porous structure can be formed by sintering titanium,
`titanium alloy powder, metal beads, metal wire mesh, or other
`suitable materials, metals, or alloys known in the art.
`The porous structure ofbody 16 is adapted for the ingrowth
`of cancellous and cortical bone spicules. In the exemplary
`embodiment, the size and shape of the porous structure emu-
`lates the size and shape of the porous structure of natural
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`bone. Preferably, the average pore diameter of body 16 is
`about 40 um to about 800 um with a porosity from about 45%
`to 65%. Further, the interconnections between pores can have
`a diameter larger than 50-60 microns. In short, the geometric
`configuration of the porous structure should encourage natu-
`ral bone to migrate and grow into and throughout the entire
`body 16.
`Although specific ranges are given for pore diameters,
`porosity, and interconnection diameters, these ranges are
`exemplary and are applicable to one exemplary embodiment.
`In other embodiments, these ranges could be modified, and
`the resulting hip implant still within the scope of the inven-
`tion.
`
`Preferably, body 16 is created with a sintering process. One
`skilled in the art will appreciate that many variations exist for
`sintering, and some of these variations may be used to fabri-
`cate the present invention. In the exemplary embodiment, the
`neck body is formed from a solid piece of metal and prepared
`using conventional and known machining techniques. Next, a
`ceramic mold is provided. The mold has a first cavity that is
`sized and shaped to match the size and shape of the bone
`fixation body. In this first cavity, the sintering material can be
`placed. The mold also has a second cavity that is adjacent and
`connected to the first cavity. This second cavity is sized and
`shaped to receive the neck body. The neck body is positioned
`in the second cavity such that the distal end surface is adjacent
`and continuous with the first cavity.
`The sintering material is then placed into the first cavity.
`This material may be a titanium alloy powder, such as Ti-6Al-
`4V. Some of this powder will contact the distal end surface of
`the neck body. The mold is then heated to perform the sinter-
`ing process. During this process, as the material in the first
`cavity heats and sinters, the bone fixation body forms and
`simultaneously bonds or fuses to the distal end surface of the
`neck body.
`The size and shape of the pores and porous structure pro-
`duced in the first cavity depend on many factors, These factors
`include, for example, the temperature obtained in the fumace,
`the sintering time, the size and shape of sintering material, the
`composition ofthe sintering material, and the type of ceramic
`mold used. These factors (and others) can be varied to pro-
`duce a bone fixation body in accordance with the present
`invention. Further, these factors (and others) can be varied to
`produce a strong bond between the bone fixation body and
`neck body.
`Once the sintering process is finished, the neck body is
`directly fused to the bone fixation body. These two bodies are
`now permanently connected together to form the hip implant.
`In the aforementioned sintering process, the bone fixation
`body simultaneously forms and attaches to the neck body.
`One skilled in the art though will appreciate that each ofthese
`bodies can be fabricated independently and subsequently
`connected together. If the bodies are made separately, then
`they may be attached or fused together using known welding
`or brazing techniques, for example.
`In FIG. 1, for example, the bone fixation body has an
`elongated tapering body with a slight bow. The bone fixation
`body, though, may have other configurations and still be
`within the scope of the invention. The size and shape of the
`body depend on the size and shape of the cavity of the mold
`during the sintering process. This cavity can be shaped, for
`example, to emulate the natural size, shape, and contour of a
`human intramedullary canal. As such, the bone fixation body
`will more naturally fit into the intramedullary canal and con-
`form to the natural anatomical contours of a human patient.
`FIGS. 3 and 4 show another hip implant 50 according to an
`exemplary embodiment of the invention. With some differ-
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`US 9,265,612 B1
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`5
`ences, implant 50 is similarly configured to the implant 10. As
`one difference, the neck body 60 of implant 50 has two
`different and distinct regions on its outer surface. A first
`region 62 has a smooth outer surface. A second region 64 has
`a bone-engaging surface that is contiguous and adjacent to the
`first region 62 on one side and contiguous and adjacent the
`porous bone fixation body 66 on the other side. The second
`region is non-porous and is shaped as a band that extends
`completely around the neck body. This second region can be
`formed on the outer surface of the neck body with various
`techniques. These techniques include, for example, coating
`with HA, grit-blasting, etching, micro-texturing, other non-
`porous surface treatments, or combinations of these tech-
`niques. This surface 64 is provided as an intermediate zone
`between the porous body and the smooth first region 62.
`As shown in FIG. 4, the second region 64 is below collar 68
`and is positioned into the intramedullary canal to contact
`bone. Region 64, then, contacts bone, and region 62 does not
`contact bone and extends above it.
`
`FIG. 5 shows another implant 70 according to another
`exemplary embodiment of the invention. With some differ-
`ences, implant 70 is similarly configured to the implant 10. As
`one difference, neck body 72 includes a male protrusion 74
`that extends outward from base portion 76. This protrusion 74
`is adapted to extend partially into the bone fixation body 78 of
`implant 70.
`The protrusion 74 forms a core for the bone fixation body.
`As shown in FIG. 5, this protrusion extends past the proximal
`end surface 80 and into the bone fixation body. The depth of
`the protrusion into the bone fixation body can be increased or
`decreased in various embodiments and still remain within the
`
`scope of the invention. For example, the protrusion can par-
`tially extend into the bone fixation body and remain substan-
`tially near the proximal end surface. Alternatively, the protru-
`sion can extend farther into the bone fixation body toward the
`distal end surface 82. In this latter embodiment, the protrusion
`gradually tapers as it extends toward the distal end surface.
`The size and shape of the protrusion can also have various
`embodiments and still remain within the scope of the inven-
`tion. For example,
`the protrusion can be cylindrical or
`polygonal, such as rectangular or square. Other configura-
`tions are possible as well; the protrusion can taper or have
`longitudinal ribs placed along its outer surface. The size and
`shape of the protrusion can have various embodiments to
`serve various functions. For example, the protrusion can be
`sized and shaped to provide a strong connection between the
`neck body and bone fixation body. The protrusion can be
`sized and shaped to provide an anti-rotational
`interface
`between the neck body and bone fixation body. Further, the
`protrusion can be sized and shaped to provide additional
`strength to the bone fixation body or more equally or effi-
`ciently distribute loads from the neck body to the bone fixa-
`tion body. Other factors as well may contribute to the design
`of the protrusion.
`FIG. 6 shows another implant 90 according to an exem-
`plary embodiment of the invention. Implant 90 has a bone
`fixation body 92 with an outer surface that has a plurality of
`undulations 94, such as hills and valleys. These undulations
`may be provided as tiny ripples or waves. Alternatively, the
`undulations may be larger and more rolling. Regardless, the
`undulations are adapted to firmly secure the implant into the
`intramedullary canal of the femur after the implant is placed
`therein.
`
`As shown in FIG. 6, the undulations extend along the entire
`length of the bone fixation body 92 from the proximal end
`surface 96 to the distal end surface 98. In alternative embodi-
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`ments, the undulations do not extend along the entire length
`ofthe bone fixation body, but partially extend along this body.
`FIGS. 7-9 show various
`longitudinal cross-sectional
`shapes of the bone fixation body for different exemplary
`embodiments of the invention. The bone fixation body may
`have one single longitudinal cross-sectional shape, or the
`body may have numerous different longitudinal cross-sec-
`tional shapes. FIGS. 7-9 represent examples of some of these
`shapes.
`FIG. 7 shows a trapezoidal longitudinal cross-sectional
`shape. FIG. 8 shows a triangular longitudinal cross-sectional
`shape. FIG. 9 shows an elliptical or oval longitudinal cross-
`sectional shape.
`The bone fixation body can be adapted to induce bone
`growth partially into or entirely through the body. The body,
`for example, can be doped with biologically active sub-
`stances. These substances may contain pharmaceutical
`agents to stimulate bone growth all at once or in a timed-
`release manner. Such biological active substances are known
`in the art.
`
`Although illustrative embodiments have been shown and
`described, a wide range of modifications, changes, and sub-
`stitutions is contemplated in the foregoing disclosure; and
`some features of the embodiments may be employed without
`a corresponding use of other features. Accordingly,
`it is
`appropriate that the appended claims be construed broadly
`and in a manner consistent with the scope ofthe embodiments
`disclosed herein.
`What is claimed is:
`
`1. A hip implant, comprising:
`a neck body formed of solid metal and including a male
`protrusion that extends outwardly from the neck body;
`and
`
`a bone fixation body connected to the neck body and hav-
`ing a polygonal shape in a horizontal cross-sectional
`view of the bone fixation body and having a porous
`structure that extends throughout the polygonal shape
`including through a center of the polygonal shape of the
`bone fixation body in the horizontal cross-sectional
`view, wherein the porous structure of the bone fixation
`body has a size and a shape that emulate a size and a
`shape of a porous structure of natural human bone,
`wherein the male protrusion of the neck body has a
`noncircular tapering shape and extends into the porous
`structure of the bone fixation body such that the porous
`structure surrounds an exterior surface of the male pro-
`trusion.
`
`2. The hip implant of claim 1, wherein the bone fixation
`body is made separately from the neck body, and the bone
`fixation body is bonded to the neck body after the bone
`fixation body is made separately from the neck body.
`3. The hip implant of claim 1, wherein the neck body
`engages the bone fixation body at an interface that has a
`trapezoidal shape in the horizontal cross-sectional view.
`4. The hip implant of claim 1, wherein the bone fixation
`body has an elongated tapering body with a bow.
`5. The hip implant of claim 1, wherein the bone fixation
`body includes an agent to stimulate, in a time-release manner,
`bone growth through the center of the bone fixation body.
`6. The hip implant of claim 1, wherein the protrusion ofthe
`neck body has one of the group consisting of a square shape
`and a rectangular shape and tapers while extending toward a
`distal end.
`
`7. A hip implant, comprising:
`a bone fixation body that has a polygonal or noncircular
`closed shape in a horizontal cross-sectional view and
`that has a porous structure that extends throughout the
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`bone fixation body including through a center of the
`bone fixation body in the horizontal cross-sectional
`view,
`wherein the porous structure includes interconnected pores
`that have a geometric structure with a shape and a size
`that emulate a shape and a size of natural human bone;
`and
`
`a neck body engaged with the bone fixation body and being
`formed of solid metal and including a male protrusion
`that extends outwardly from the neck body and into the
`porous structure of the bone fixation body.
`8. The hip implant of claim 7, wherein the male protrusion
`of the neck body is a core for the bone fixation body and has
`a polygonal and tapering shape that extends into the porous
`structure of the bone fixation body.
`9. The hip implant of claim 7, wherein the bone fixation
`body has one ofthe group consisting of a trapezoidal shape, a
`triangular shape, an elliptical shape, and an oval shape in the
`horizontal cross-sectional view.
`
`10. The hip implant of claim 7, wherein the porous struc-
`ture completely fills the polygonal or noncircular closed
`shape of the bone fixation body in the horizontal cross-sec-
`tional view.
`
`11. The hip implant of claim 7, wherein the porous struc-
`ture includes a substance to stimulate, in a time-released
`manner, bone growth throughout the porous structure and
`through the center.
`12. A hip implant, comprising:
`a neck body having a proximal end that connects with an
`acetabular component, having a distal end surface with
`an elongated protrusion that extends outwardly there-
`from, and being formed of solid metal; and
`a bone fixation body having an elongated tapering shape
`and being formed as a porous metal structure that
`includes a proximal end that engages the distal end sur-
`face of the neck body at an interface,
`wherein the elongated protrusion of the neck body forms a
`core for the bone fixation body and tapers and extends
`into an opening of the bone fixation body such that the
`porous metal structure surrounds and engages an exte-
`rior surface ofthe elongated protrusion that extends into
`the bone fixation body, and
`wherein the porous structure of the bone fixation body has
`a size and a shape that emulate a size and a shape of a
`porous structure of natural human bone.
`13. The hip implant of claim 12, wherein the bone fixation
`body has one of the group consisting of a polygonal and
`noncircular closed shape in a horizontal cross-sectional view
`ofthe bone fixation body and is bonded to the neck body after
`being formed separately from the neck body.
`14. The hip implant of claim 12, wherein the bone fixation
`body includes a location having one ofthe group consisting of
`a polygonal shape and an oval shape in a horizontal cross-
`sectional view ofthe bone fixation body, and the porous metal
`structure extends through a center ofthe one of the polygonal
`shape and the oval shape in the horizontal cross-sectional
`view.
`
`15. The hip implant of claim 12, wherein the distal end
`surface of the neck body has a noncircular closed shape, the
`proximal end of the bone fixation body has a noncircular
`closed shape, and the solid metal of the noncircular closed
`shape of the neck body interfaces with the porous metal
`structure of the noncircular closed shape of the bone fixation
`body at the interface.
`
`10
`
`15
`
`20
`
`25
`
`30
`
`35
`
`40
`
`45
`
`50
`
`55
`
`60
`
`8
`16. The hip implant of claim 12, wherein the bone fixation
`body includes a trapezoidal shape in a horizontal cross-sec-
`tional view of the bone fixation body, and the elongated
`protrusion includes a polygonal shape in the horizontal cross-
`sectional view.
`
`17. The hip implant of claim 12, wherein the distal end
`surface ofthe neck body has a trapezoidal shape, the proximal
`end of the bone fixation body has the trapezoidal shape, and
`the solid metal of the trapezoidal shape of the neck body
`interfaces with the porous metal structure of the trapezoidal
`shape of the bone fixation body at the interface.
`18. The hip implant of claim 12, wherein the bone fixation
`body includes a trapezoidal shape in a horizontal cross-sec-
`tional view of the bone fixation body, and the elongated
`protrusion includes a cylindrical shape in the horizontal
`cross-sectional view.
`
`19. A hip implant, comprising:
`a neck body formed of solid metal, having a proximal end
`with a tapering cylindrical configuration that connects
`with an acetabular component, and having a distal end
`surface with an elongated protrusion that extends out-
`wardly therefrom; and
`a bone fixation body having an elongated tapering shape
`without a solid metal substrate and being formed as a
`porous metal structure that includes a proximal end that
`engages the distal end surface of the neck body at an
`interface,
`wherein the elongated protrusion of the neck body forms a
`core for the bone fixation body and tapers and extends
`into an opening of the bone fixation body such that the
`porous metal structure surrounds and engages an exte-
`rior surface ofthe elongated protrusion that extends into
`the bone fixation body,
`wherein the porous metal structure of the bone fixation
`body has a size and a shape that emulate a size and a
`shape of a porous structure of natural human bone,
`wherein the distal end surface of the neck body has a
`noncircular closed shape, the proximal end of the bone
`fixation body has a noncircular closed shape, and the
`solid metal of the noncircular closed shape of the neck
`body interfaces with the porous metal structure of the
`noncircular closed shape ofthe bone fixation body at the
`interface,
`wherein the bone fixation body includes a trapezoidal
`shape in a horizontal cross-sectional view of the bone
`fixation body,
`wherein the bone fixation body and the neck body are
`fabricated separately and subsequently the bone fixation
`body is bonded from heat to the neck body after the bone
`fixation body is fabricated separately from the neck
`body,
`wherein the bone fixation body has the elongated tapering
`shape with a bow shape in a side-view of the bone
`fixation body,
`wherein the elongated protrusion ofthe neck body includes
`a polygonal shape in the horizontal cross-sectional view,
`and
`
`wherein the bone fixation body bonds to the neck body
`along the interface that includes where the polygonal
`shape of the elongated protrusion of the neck body
`engages the bone fixation body.
`*
`*
`*
`*
`
`*
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`Page 8 of 8
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